CLASS 8 BIOLOGY FOOD PRODUCTION

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Questions and Answers

Which bacteria is mainly responsible for converting milk sugar into lactic acid during curd formation?

  • Rhizobium
  • Nitrobacter
  • Lactobacillus (correct)
  • Staphylococcus

What process is involved in curd making where milk sugar is converted into lactic acid?

  • Distillation
  • Evaporation
  • Fermentation (correct)
  • Condensation

Which of the following is a nutritious milk product rich in proteins, fats, calcium, and vitamins that requires bacteria for cuddling of milk?

  • Cream
  • Cheese (correct)
  • Yogurt
  • Butter

Which of the following bacteria are used in the production of yogurt?

<p>Lactobacillus and Staphylococcus (D)</p> Signup and view all the answers

What is the purpose of salting in cheese making?

<p>Prevent growth of harmful microorganisms (B)</p> Signup and view all the answers

The process of removing bitterness from tea leaves and enhancing their flavor and aroma is known as what?

<p>Curing (C)</p> Signup and view all the answers

The conversion of atmospheric nitrogen into compounds usable by plants is known as?

<p>Nitrogen Fixation (A)</p> Signup and view all the answers

What bacteria lives in the root nodules of leguminous plants and helps in nitrogen fixation?

<p>Rhizobium (A)</p> Signup and view all the answers

What gas is produced by yeast in bread making that causes the dough to rise?

<p>Carbon Dioxide (B)</p> Signup and view all the answers

What type of organisms are yeast and mushrooms?

<p>Fungi (C)</p> Signup and view all the answers

In a broad sense, what does agriculture include?

<p>Growing plants and raising animals (B)</p> Signup and view all the answers

Plants grown and cared for in a field are known as?

<p>Crops (D)</p> Signup and view all the answers

Wheat, rice, and maize are examples of which type of crop?

<p>Cereals (D)</p> Signup and view all the answers

Crops produced for sale to earn money are known as?

<p>Cash crops (B)</p> Signup and view all the answers

Which crops are grown during the winter season and harvested in spring?

<p>Rabi crops (A)</p> Signup and view all the answers

Growing vegetables, fruits, and flowers is dealt with in which branch of science?

<p>Horticulture (B)</p> Signup and view all the answers

What farming practice avoids the use of chemical fertilizers and pesticides?

<p>Organic farming (D)</p> Signup and view all the answers

What was achieved during the Green Revolution?

<p>Large increase in crop production (D)</p> Signup and view all the answers

What is the branch of science that deals with the feeding, shelter, health, and breeding of domestic animals?

<p>Animal husbandry (A)</p> Signup and view all the answers

Animals like what provide security to human beings?

<p>Dogs (D)</p> Signup and view all the answers

Which of the following processes relies on bacteria to remove bitterness and enhance flavor?

<p>Curing of tea leaves (C)</p> Signup and view all the answers

Which of the following is NOT a primary application of bacteria, as mentioned in the text?

<p>Enhancing the aesthetic appeal of gardens (B)</p> Signup and view all the answers

Why is cheese salted during the cheese-making process?

<p>To prevent growth of harmful microorganisms (D)</p> Signup and view all the answers

How does cooling curd after it is formed prevent it from becoming overly sour?

<p>It slows down the activity of Lactobacillus (A)</p> Signup and view all the answers

Which condition is MOST important for Lactobacillus to effectively convert milk into curd?

<p>Ambient temperature (D)</p> Signup and view all the answers

In commercial yogurt production, what is the primary role of Staphylococcus bacteria?

<p>Acid production (C)</p> Signup and view all the answers

What is the role of saprophytic bacteria in the environment?

<p>Releasing nutrients to the soil (C)</p> Signup and view all the answers

What is the relationship between leguminous plants and Rhizobium bacteria?

<p>Symbiotic (D)</p> Signup and view all the answers

What do Nitrobacter and Nitrosomonas bacteria contribute to the soil?

<p>Conversion of atmospheric nitrogen (C)</p> Signup and view all the answers

Which of the following is NOT a commercial use of fungi?

<p>Enhancing the flavor of tea (C)</p> Signup and view all the answers

Why is yeast added to dough in bread making?

<p>To produce carbon dioxide (C)</p> Signup and view all the answers

Besides providing food, how else do animals assist in agriculture?

<p>By providing pollination and security (D)</p> Signup and view all the answers

Which of the following is NOT a feature developed as part of the Green Revolution?

<p>Increased use of organic farming techniques (B)</p> Signup and view all the answers

What is the primary focus of animal husbandry?

<p>Systematic rearing of animals for food and other products (B)</p> Signup and view all the answers

Considering the context of food preservation and safety, what does the ripening process achieve in cheese making?

<p>Development of particular flavors (D)</p> Signup and view all the answers

In organic farming, which practice is used to enhance soil fertility without chemical fertilizers?

<p>Crop rotation (D)</p> Signup and view all the answers

What distinguishes cash crops from food crops?

<p>Cash crops are primarily for sale, while food crops are for consumption. (D)</p> Signup and view all the answers

What is the scientific study of cultivating vegetables, fruits, and flowers called?

<p>Horticulture (A)</p> Signup and view all the answers

What role does yeast play in making idli and dosa?

<p>Causes the mixture to rise and become sour (C)</p> Signup and view all the answers

What constitutes the livestock wealth of a country?

<p>Domesticated useful animals (D)</p> Signup and view all the answers

Considering the role of bacteria in both curd and yogurt production, what is the crucial distinction in the bacterial cultures used and their impact on the final product?

<p>Curd uses a single strain of bacteria for fermentation, while yogurt utilizes a mixed culture, with <em>Staphylococcus</em> contributing primarily to acid production and <em>Lactobacillus</em> enhancing flavor and aroma. (D)</p> Signup and view all the answers

How does the process of 'curing' tea leaves, utilizing bacteria, directly contribute to the sensory experience of tea consumption?

<p>By removing tannins and other astringent compounds, leading to a smoother, less bitter taste and enhancing the tea's aroma. (A)</p> Signup and view all the answers

In the context of nitrogen fixation, what is the most accurate comparison of roles between Rhizobium, Nitrosomonas, and Nitrobacter?

<p><em>Rhizobium</em> converts atmospheric nitrogen into ammonia, <em>Nitrosomonas</em> converts ammonia to nitrites, and <em>Nitrobacter</em> converts nitrites to nitrates. (D)</p> Signup and view all the answers

How does the strategic implementation of multiple cropping, incorporating both nitrogen-fixing and high-yield crops, contribute to sustainable agriculture?

<p>It reduces the need for synthetic fertilizers by naturally replenishing soil nitrogen, while maximizing land use and crop yield. (B)</p> Signup and view all the answers

What are the key trade-offs a farmer must consider when choosing between organic and conventional farming methods, regarding long-term sustainability and economic viability?

<p>Organic farming promotes biodiversity and soil health but may result in lower yields and higher labor costs, while conventional farming can lead to higher yields but risks environmental degradation and reliance on synthetic inputs. (B)</p> Signup and view all the answers

What is the role of yeast in making idli and dosa?

<p>Yeast helps in fermentation and leavening. (C)</p> Signup and view all the answers

How does the application of animal husbandry principles lead to improvements in livestock production beyond simply increasing the number of animals raised?

<p>By implementing selective breeding programs to enhance desirable traits, optimizing feeding strategies to improve animal health and productivity, and ensuring proper healthcare to reduce disease. (D)</p> Signup and view all the answers

When comparing the nutritional profiles of crops produced through organic farming versus conventional farming, what crucial differences might influence consumer health and dietary choices?

<p>Organically farmed crops may contain lower levels of pesticide residues and potentially higher levels of certain antioxidants, while conventionally farmed crops may have higher yields and potentially different nutrient compositions due to fertilizer use. (A)</p> Signup and view all the answers

Considering the range of applications for fungi in food production, agriculture, industry, and medicine, what reflects the unique challenges and opportunities associated with their commercial use?

<p>Fungi offer versatile applications across various industries but require precise environmental controls due to sensitivity to contamination and variable growth conditions, necessitating specialized knowledge and equipment for consistent production. (B)</p> Signup and view all the answers

How does the integration of silviculture, the cultivation of trees, with traditional agriculture influence the overall sustainability and resilience of farming systems?

<p>Silviculture provides shade and protection from wind for crops and livestock, improves soil health and water retention, and diversifies income sources through timber and non-timber forest products, enhancing ecosystem resilience. (C)</p> Signup and view all the answers

Bacteria are not employed in the preparation of food products.

<p>False (B)</p> Signup and view all the answers

Lactobacillus converts lactose into lactic acid during curd making.

<p>True (A)</p> Signup and view all the answers

Extreme temperatures favor the growth of bacteria in milk for curd formation.

<p>False (B)</p> Signup and view all the answers

Staphylococcus is primarily used for flavor production in yogurt.

<p>False (B)</p> Signup and view all the answers

The first step in cheese making involves the cuddling of milk, which requires bacteria.

<p>True (A)</p> Signup and view all the answers

Curing of tea is carried out with the help of viruses.

<p>False (B)</p> Signup and view all the answers

Rhizobium increases soil fertility by extracting nitrogen from the soil.

<p>False (B)</p> Signup and view all the answers

Fungi are multicellular organisms that contain chlorophyll.

<p>False (B)</p> Signup and view all the answers

Yeast is commonly used in bakery products.

<p>True (A)</p> Signup and view all the answers

Agriculture only includes the cultivation of land.

<p>False (B)</p> Signup and view all the answers

Cereals, pulses, and oil crops are examples of cash crops.

<p>False (B)</p> Signup and view all the answers

Rabi crops are harvested during the autumn season.

<p>False (B)</p> Signup and view all the answers

Horticulture deals only with growing fruits.

<p>False (B)</p> Signup and view all the answers

Organic farming involves the use of chemical fertilizers and pesticides.

<p>False (B)</p> Signup and view all the answers

Animal husbandry deals with the feeding, shelter, health, and breeding of wild animals.

<p>False (B)</p> Signup and view all the answers

The conversion of milk sugar into lactic acid during curd making is primarily facilitated by Staphylococcus bacteria.

<p>False (B)</p> Signup and view all the answers

Cheese production involves bacterial action in the cuddling of milk, followed by processing to remove moisture, salting to prevent harmful microorganisms, and ripening to impart flavor.

<p>True (A)</p> Signup and view all the answers

In the tea industry, curing, a process that relies on bacterial action, is essential for adding sweetness to tea leaves.

<p>False (B)</p> Signup and view all the answers

Nitrobacter and Nitrosomonas are examples of nitrogen-fixing bacteria that reside in the root nodules of leguminous plants.

<p>False (B)</p> Signup and view all the answers

Fungi such as yeast are commercially valuable solely for their role in antibiotic production within the medical field.

<p>False (B)</p> Signup and view all the answers

In bread making, the dough rises due to the production of oxygen as a result of yeast respiration.

<p>False (B)</p> Signup and view all the answers

Agriculture strictly involves the cultivation of land for crop production and excludes raising animals.

<p>False (B)</p> Signup and view all the answers

Cereals, pulses, and oil crops are classified based on the method of farming used, such as hydroponics or traditional soil methods.

<p>False (B)</p> Signup and view all the answers

Cash crops are grown solely for personal consumption, in contrast to food crops, which are sold for profit.

<p>False (B)</p> Signup and view all the answers

Rabi crops are cultivated during the monsoon season and harvested in the autumn, while Kharif crops are grown in the winter and harvested in the spring.

<p>False (B)</p> Signup and view all the answers

Products from organic farming are more prone to contamination due to the increased use of chemical fertilisers.

<p>False (B)</p> Signup and view all the answers

The Green Revolution primarily focused on reducing crop yields through traditional farming methods.

<p>False (B)</p> Signup and view all the answers

Animal husbandry solely concerns the health of domestic animals and excludes aspects such as feeding and shelter.

<p>False (B)</p> Signup and view all the answers

Draught animals are primarily those raised for their meat, such as goats and pigs.

<p>False (B)</p> Signup and view all the answers

Milk is predominantly rich in carbohydrates, with minimal protein content.

<p>False (B)</p> Signup and view all the answers

The conversion of milk lactose into lactic acid during curd formation is primarily facilitated by Staphylococcus bacteria.

<p>False (B)</p> Signup and view all the answers

In commercial yogurt production, Lactobacillus is primarily responsible for acid production, whereas Staphylococcus mainly contributes to the yogurt's distinct flavor and aroma.

<p>False (B)</p> Signup and view all the answers

The curing process in the tea industry, which involves the removal of bitterness and the development of specific flavors, is primarily facilitated by fungi.

<p>False (B)</p> Signup and view all the answers

Nitrobacter and Nitrosomonas are bacteria involved in nitrogen fixation that live in symbiotic relationship with leguminous plants.

<p>False (B)</p> Signup and view all the answers

The production of carbon dioxide, essential in making bread rise, is a direct result of photosynthesis by yeast in the dough.

<p>False (B)</p> Signup and view all the answers

The term 'produce' in agriculture refers specifically to genetically modified organisms (GMOs) that enhance crop yield.

<p>False (B)</p> Signup and view all the answers

Horticulture mainly focuses on broad-acre crop cultivation, such as wheat and rice, rather than individual plants.

<p>False (B)</p> Signup and view all the answers

A key advantage of organic farming is its increased reliance on synthetic pesticides, which leads to higher crop yields compared to conventional farming methods.

<p>False (B)</p> Signup and view all the answers

The Green Revolution primarily focused on incorporating traditional farming techniques to enhance crop production, thereby reducing dependency on chemical inputs.

<p>False (B)</p> Signup and view all the answers

In animal husbandry, 'draught animals' are primarily raised for meat production, ensuring a consistent and high-quality supply of animal protein for human consumption.

<p>False (B)</p> Signup and view all the answers

Human beings employ the characteristics of ______ in the preparation of several food products like curd, cheese, butter and yogurt.

<p>bacteria</p> Signup and view all the answers

[Blank] bacteria release nutrients to the soil, thereby helping in cleaning the earth and bringing about cycling of nutrients.

<p>saprophytic</p> Signup and view all the answers

Making of curd is a process in which the lactose of the milk is converted into lactic ______ by the action of certain bacteria.

<p>acid</p> Signup and view all the answers

[Blank] starts growing and converts milk sugar of the milk into lactic acid.

<p>lactobacillus</p> Signup and view all the answers

Commercial yogurt is made from milk mixed with a mixed culture of Staphylococcus and ______.

<p>lactobacillus</p> Signup and view all the answers

The first step in cheese making, cuddling of milk, requires ______.

<p>bacteria</p> Signup and view all the answers

In tea industry ______ of tea is carried out with the help of bacteria.

<p>curing</p> Signup and view all the answers

The bacterium ______ lives in the root nodules.

<p>rhizobium</p> Signup and view all the answers

[Blank] and mushrooms are used widely in food industry

<p>yeast</p> Signup and view all the answers

In bread-making, ______ is added to the uncooked dough to make the dough rise

<p>yeast</p> Signup and view all the answers

Plants grown and cared for in a ______ are known as crop plants or simply crops

<p>field</p> Signup and view all the answers

Crops produced for sale to earn money, rather than for use by the grower are known as ______ crops.

<p>cash</p> Signup and view all the answers

Crops grown during monsoon and harvested during autumn are known as ______ crops.

<p>kharif</p> Signup and view all the answers

[Blank] is a branch of science that deals with growing of vegetables, flowers fruits, ornamental plants, spices, etc.

<p>horticulture</p> Signup and view all the answers

Systematic raising or rearing of animals for food and other products forms the basis of ______ husbandry

<p>animal</p> Signup and view all the answers

The process of removing bitterness from tea leaves and obtaining a specific flavour and aroma is called ______.

<p>curing</p> Signup and view all the answers

The conversion of atmospheric nitrogen into usable compounds by bacteria and blue-green algae is known as ______ ______.

<p>nitrogen fixation</p> Signup and view all the answers

[Blank] are unicellular or multicellular organisms without chlorophyll used in food, agriculture, industry, and medicine.

<p>fungi</p> Signup and view all the answers

The rise of dough in bread making is due to the production of ______ ______ gas by yeast during respiration.

<p>carbon dioxide</p> Signup and view all the answers

Crops grown for sale to earn money, rather than for direct consumption, are known as ______ ______.

<p>cash crops</p> Signup and view all the answers

Crops grown during the winter season and harvested in the spring are known as ______ crops.

<p>rabi</p> Signup and view all the answers

The branch of science dealing with the cultivation of vegetables, fruits, and flowers is called ______.

<p>horticulture</p> Signup and view all the answers

[Blank] farming avoids the use of chemical fertilizers and pesticides, relying on methods like crop rotation and natural manures.

<p>organic</p> Signup and view all the answers

The ______ ______ was a period marked by a large increase in crop production through the use of chemical fertilizers, pesticides, and high-yielding varieties.

<p>green revolution</p> Signup and view all the answers

[Blank] ______ is the branch of science dealing with the feeding, shelter, health, and breeding of domestic animals.

<p>animal husbandry</p> Signup and view all the answers

Animals used for field work, such as horses and oxen, are known as ______ animals.

<p>draught</p> Signup and view all the answers

The bacteria, primarily Lactobacillus, converts milk sugar (lactose) into ______ ______ during curd production.

<p>lactic acid</p> Signup and view all the answers

In yogurt production, Staphylococcus is mainly used for ______ ______, while Lactobacillus contributes to flavor and aroma.

<p>acid production</p> Signup and view all the answers

Salting in cheese making helps to prevent the growth of harmful ______, while ripening imparts a particular flavor.

<p>microorganisms</p> Signup and view all the answers

Rhizobium bacteria live in the ______ ______ of leguminous plants, forming a symbiotic relationship to fix nitrogen.

<p>root nodules</p> Signup and view all the answers

The process of removing bitterness from tea leaves and obtaining specific flavor and aroma is known as ______.

<p>curing</p> Signup and view all the answers

The conversion of atmospheric nitrogen into compounds usable by plants, carried out by bacteria like Rhizobium in root nodules, is known as ______.

<p>nitrogen fixation</p> Signup and view all the answers

In yogurt production, Staphylococcus species are crucial for ______, whereas Lactobacillus largely contributes to the final flavor and aroma.

<p>acid production</p> Signup and view all the answers

The effectiveness of organic farming lies in its avoidance of synthetic inputs, utilizing methods such as crop rotation and manures to naturally enhance the soil's ______ and overall health.

<p>fertility</p> Signup and view all the answers

During cheese production, the addition of ______ inhibits the growth of undesirable microorganisms and also influences the final flavor profile of the cheese.

<p>salt</p> Signup and view all the answers

The characteristic rise of dough in bread-making is primarily due to the production of ______ by yeast during respiration, which leavens the dough.

<p>carbon dioxide</p> Signup and view all the answers

Unlike conventional agriculture, organic farming enhances soil structure and nutrient availability through ______, which reduces reliance on synthetic fertilizers and pesticides.

<p>natural processes</p> Signup and view all the answers

The symbiotic relationship between Rhizobium bacteria and leguminous plants facilitates ______, enriching the soil and reducing the need for synthetic nitrogen fertilizers.

<p>nitrogen fixation</p> Signup and view all the answers

The role of saprophytic bacteria in ecosystems is vital for releasing nutrients back into the soil through the decomposition of organic matter, which supports ______.

<p>nutrient cycling</p> Signup and view all the answers

In the dairy industry, controlling the temperature during curd production is crucial because extreme temperatures can inhibit the growth of Lactobacillus, leading to a failure in ______.

<p>curd formation</p> Signup and view all the answers

What type of bacteria is primarily used for acid production in yogurt?

<p>Staphylococcus</p> Signup and view all the answers

What is the process of removing bitterness from tea leaves called?

<p>Curing</p> Signup and view all the answers

Name a bacterium found in root nodules that aids in nitrogen fixation.

<p>Rhizobium</p> Signup and view all the answers

What gas is produced by yeast that causes dough to rise?

<p>Carbon dioxide</p> Signup and view all the answers

What is the science of growing plants and raising animals called?

<p>Agriculture</p> Signup and view all the answers

What are plants grown in a field called?

<p>Crop plants</p> Signup and view all the answers

Name a crop that is grown to be sold for money.

<p>Cash crop</p> Signup and view all the answers

During which season are Rabi crops grown?

<p>Winter season</p> Signup and view all the answers

What branch of science deals with the growing of vegetables, fruits, and flowers?

<p>Horticulture</p> Signup and view all the answers

What type of farming avoids the use of chemical fertilizers and pesticides?

<p>Organic farming</p> Signup and view all the answers

What is the name of the period when the crop and food grain production increased due to chemical fertilizers?

<p>Green Revolution</p> Signup and view all the answers

What is the branch of science which deals with the feeding, shelter, health and breeding of domestic animals called?

<p>Animal husbandry</p> Signup and view all the answers

What are milk-yielding animals also known as?

<p>Milch animals</p> Signup and view all the answers

Name the bacteria mainly responsible for converting lactose into lactic acid in curd.

<p>Lactobacillus</p> Signup and view all the answers

Name a viral disease that affects cattle.

<p>Cowpox</p> Signup and view all the answers

How does the use of Staphylococcus in yogurt production differ from the use of Lactobacillus?

<p><em>Staphylococcus</em> is primarily used for acid production, while <em>Lactobacillus</em> contributes to flavour and aroma.</p> Signup and view all the answers

What is the purpose of salting in the cheese-making process, and how does it contribute to the final product?

<p>Salting helps to prevent the growth of harmful microorganisms and contributes to the particular flavor of the cheese.</p> Signup and view all the answers

Explain how bacteria contribute to increasing soil fertility, and name one type of bacteria involved in this process.

<p>Bacteria convert atmospheric nitrogen into compounds usable by plants. <em>Rhizobium</em> is an example of a nitrogen-fixing bacteria that lives in the root nodules of leguminous plants.</p> Signup and view all the answers

In the context of tea processing, what is 'curing,' and how do bacteria contribute to this process?

<p>Curing is the process of removing bitterness from tea leaves and developing a specific flavor and aroma, which bacteria facilitate.</p> Signup and view all the answers

How does the temperature of milk affect the growth of Lactobacillus bacteria during curd making, and why is this important?

<p>Ambient or warm temperature promotes the growth of <em>Lactobacillus</em>. Extreme temperatures inhibit bacterial growth, preventing curd formation.</p> Signup and view all the answers

Compare and contrast the roles of bacteria in the production of curd and yogurt.

<p>Both use bacteria to ferment milk, but curd primarily relies on <em>Lactobacillus</em>, while yogurt uses a combination of <em>Staphylococcus</em> and <em>Lactobacillus</em> for acid production, flavor, and aroma.</p> Signup and view all the answers

Why is it important to transfer curd to a cool place after it has formed?

<p>To slow down the growth of bacteria and prevent the curd from becoming too sour due to excessive lactic acid production.</p> Signup and view all the answers

What role do saprophytic bacteria play in the environment, as mentioned in the text?

<p>Saprophytic bacteria help clean the environment by releasing nutrients to the soil, which facilitates the cycling of nutrients.</p> Signup and view all the answers

How does the symbiotic relationship between Rhizobium bacteria and leguminous plants benefit both organisms?

<p><em>Rhizobium</em> fixes atmospheric nitrogen into usable compounds for the plant, while the plant provides the bacteria with a habitat and nutrients.</p> Signup and view all the answers

Explain how yeast contributes to the process of bread making.

<p>Yeast produces carbon dioxide gas through respiration, causing the dough to rise and giving bread its light, airy texture.</p> Signup and view all the answers

Describe the key differences between cash crops and food crops, providing an example of each.

<p>Cash crops are grown for sale to earn money (e.g., cotton), while food crops are grown for consumption (e.g., rice).</p> Signup and view all the answers

What are the main advantages and disadvantages of organic farming compared to conventional farming methods?

<p>Advantages include chemical-free products and reduced pollution; disadvantages include higher costs and shorter shelf life.</p> Signup and view all the answers

Identify two key factors that contributed to the Green Revolution in agriculture.

<p>The use of chemical fertilizers and pesticides, and the development of high-yielding varieties (HYV) of crops.</p> Signup and view all the answers

How can animal husbandry contribute to the agricultural sector?

<p>Animal husbandry provides milk, meat, and other products and supports field work using draught animals.</p> Signup and view all the answers

Explain why the relationship between the roots of plants and the bacteria Rhizobium is considered a symbiotic relationship.

<p>The plant provides nutrients to the bacteria, and the bacteria fix nitrogen for the plant.</p> Signup and view all the answers

How does the presence of Rhizobium bacteria in root nodules exemplify a symbiotic relationship, and what is the broader significance of this relationship for sustainable agriculture?

<p>Rhizobium converts atmospheric nitrogen into usable nitrogen compounds for the plant, while the plant provides the bacteria with carbohydrates. This reduces the need for synthetic nitrogen fertilizers.</p> Signup and view all the answers

Explain the scientific principles behind the role of bacteria in tea curing, and discuss how different bacterial strains might be manipulated to produce teas with distinct flavor profiles.

<p>Bacteria break down complex compounds in tea leaves, reducing bitterness and creating flavor. Different bacterial strains could be used for distinct flavor profiles.</p> Signup and view all the answers

Describe the metabolic process by which Lactobacillus converts lactose into lactic acid during curd formation, and explain why controlling the temperature is crucial in this process.

<p><em>Lactobacillus</em> ferments lactose into lactic acid, thickening the milk. Temperature control is essential to prevent excessive acid production, which would make the curd sour.</p> Signup and view all the answers

Contrast the specific roles of Staphylococcus and Lactobacillus in yogurt production, and hypothesize how altering the ratio of these bacteria could affect the final product's characteristics.

<p><em>Staphylococcus</em> primarily produces acid, while <em>Lactobacillus</em> enhances flavor and aroma. Altering the ratio could impact acidity, flavor, and texture.</p> Signup and view all the answers

Outline the key steps in cheese production where bacteria play a critical role, and analyze how specific bacterial strains contribute to the unique flavors and textures of different cheese varieties.

<p>Bacteria are essential for milk coagulation, curd formation, and ripening. Different strains contribute to unique flavor and texture through enzymatic activity.</p> Signup and view all the answers

Explain how the principles of crop rotation and the use of animal and green manures contribute to maintaining soil fertility in organic farming, and discuss the limitations of these methods compared to synthetic fertilizers.

<p>Crop rotation prevents nutrient depletion, while manures add organic matter and nutrients. Limitations include lower nutrient concentration and slower release compared to synthetic fertilizers.</p> Signup and view all the answers

Critically evaluate the environmental and economic impacts of the Green Revolution, considering both the benefits of increased crop yields and the drawbacks of reliance on chemical fertilizers and pesticides.

<p>The Green Revolution increased yields but led to pollution. It also increased costs for farmers and reduced biodiversity.</p> Signup and view all the answers

Describe the major categories of livestock based on their uses and products, providing specific examples of animals within each category and explaining how selective breeding has influenced their characteristics.

<p>Categories include milk-yielding, flesh-yielding, and draught animals. Selective breeding has enhanced traits like milk production or muscle mass.</p> Signup and view all the answers

Discuss potential strategies for mitigating the disadvantages of organic farming, such as lower yields and shorter shelf life, while preserving its environmental benefits and principles of sustainability.

<p>Strategies include improved composting, crop diversification, and better storage. These can improve yields and shelf life while maintaining organic practices.</p> Signup and view all the answers

Explain how nitrogen-fixing bacteria contribute to increasing soil fertility. Include specific bacterial examples and the forms of nitrogen they produce that plants can utilize.

<p>Nitrogen-fixing bacteria, like <em>Rhizobium</em>, convert atmospheric nitrogen into ammonia, which is then transformed into ammonium and nitrates, usable by plants.</p> Signup and view all the answers

Flashcards

Bacteria in Agriculture

Bacteria used to increase soil fertility in agriculture.

Lactobacillus

Bacteria that convert milk sugar (lactose) into lactic acid, crucial in curd formation.

Cheese

A nutritious milk product rich in proteins, fats, calcium and vitamins, made using bacteria for curdling.

Curing of Tea

The process of removing bitterness and enhancing flavor in tea leaves using bacteria.

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Nitrogen Fixation

Converting atmospheric nitrogen into usable nitrogen compounds, carried out by bacteria and blue-green algae.

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Root Nodules

Swollen structures on the roots of leguminous plants where Rhizobium bacteria live.

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Rhizobium

A symbiotic bacterium living in root nodules of leguminous plants, aiding in nitrogen fixation.

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Agriculture

Raising plants and animals for human use, including cultivation, breeding, and management.

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Crop Plants

Plants that are grown and cared for in a field.

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Cash Crops

Crops grown for sale to earn money, rather than for personal consumption.

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Food Crops

Crops grown for the production of food for consumption.

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Rabi Crops

Crops grown during the winter season and harvested in the spring.

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Kharif Crops

Crops grown during the monsoon season and harvested in the autumn.

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Horticulture

A branch of science dealing with the growing of vegetables, fruits, flowers, and ornamental plants.

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Organic Farming

The practice of farming without using chemical fertilizers and pesticides.

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Green Revolution

A period of increased crop production due to chemical fertilizers, pesticides, and high-yielding crop varieties.

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Animal Husbandry

The branch of science dealing with the feeding, shelter, health, and breeding of domestic animals.

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Milk-Yielding Animals

Animals raised for milk production.

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Cowpox

Viral disease in cattle

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Anthrax

Bacterial disease in cattle

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Bacteria in Food Production

Bacteria employed in the food industry to produce items like curd, cheese, butter, and yogurt.

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Staphylococcus in Yogurt

A genus of bacteria used in commercial yogurt production for acid production.

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Yogurt Production

Commercial yogurt is produced from milk, typically after evaporating about 25% of the water in a vacuum pan, then mixing it with cultures.

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Temperature for Bacteria Growth in Milk

Bacteria require a moderate temperature to grow and thrive in milk, which is essential for curd formation.

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Horticultural Crops

Vegetables, fruits, flowers and other non-green plants that are grown under horticulture

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Application Of Science

Application of scientific knowledge to produce the material needs of human beings.

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Indigenous breeds of cow

Breeds of cow that yield high quantity and quality of milk – like Red Sindhi, Sahiwal and Gir.

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Exotic breeds of cow

Breeds of cow that yield high quantity and quality of milk – like Brown Swiss, Jersey and Holstein Friesian.

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Foot and Mouth disease

Disease of Cattle, also known as viral disease

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Saprophytic Bacteria

Bacteria that decompose organic matter, releasing nutrients back into the soil.

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Field (Agriculture)

The cultivation of land for growing crops.

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Traditional Farming

Using crop rotation, manures, and biological pest control to maintain soil fertility.

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Flesh-yielding animals

Animals like goats, sheep, pigs and poultry are raised and used for meat production.

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Timber

A branch of science concerned with the cultivation, management, and study of forests and related natural resources.

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Fibre-yielding animals

Animals which provide materials for clothing, like sheep and goats.

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Crop Classification

Crops are classified based on their purpose: earning money versus food.

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Defining Animal Husbandry

Branch of science focused on feeding, shelter, health, and breeding of domestic animals.

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Nitrogen Fixation Process

Converting atmospheric nitrogen into compounds usable by plants, performed by certain bacteria and algae.

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Draught Animals

Animals used for pulling or carrying heavy loads or performing farm work.

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What is Domestication?

Process of acclimating animals to live alongside humans, providing mutual benefits.

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Defining Organic Farming

Crops requiring no chemical fertilizers or pesticides and following traditional methods of farming.

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Hide-yielding animals

Animals raised to produce materials used for clothes

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Biological Nitrogen Fixers

Microbes able to convert elemental nitrogen into nitrogen compounds usable by plants.

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Mushrooms

A nutritious food source rich in protein, vitamin B, vitamin D and minerals.

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Fungi Commercial Uses

Unicellular and multicellular organisms lacking chlorophyll and used for commercial purposes.

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Commercial Yeast

A unicellular fungus used widely in the food industry, particularly in baking and brewing.

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Defining Agriculture

Science of growing plants and raising animals useful to humans.

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Crop Produce

The product obtained from a crop.

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Tuber crops

Crops like potato and tapioca cultivated for their subterranean edible parts.

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Sugar crops

Crops like sugarcane and beetroot cultivated for making sugar.

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Plantation crops

Crops like tea and coffee which are cultivated on large estates.

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Spices

Crops like pepper, clove, coriander and turmeric added to others for flavoring.

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Commercial Yeast Uses

A nutritious food source for humans and farm animals, used in bakery products.

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Foreign breeds of cow

Breeds of cow that yield high quantity and quality of milk that is from another country – like Brown Swiss, Jersey and Holstein Friesian.

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Ornamental Plants

Plants produced for beauty, fragrance, or design.

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Ornamental Trees

Trees valued for their visual appeal and landscape enhancement.

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Fibre crops

Crops like cotton, jute and hemp that produces materials from which fabrics/clothes can be made.

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Curd Formation

Converting warm milk with Lactobacillus, resulting in lactic acid production and curd formation.

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Temperature Effects on Curd

A process where ambient temperature is essential for bacterial growth in milk, leading to curd formation.

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Yeast in Bread Making

Used in bread-making; produces carbon dioxide, causing the dough to rise due to respiration.

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Rearing of Animals

The systematic raising of animals for food and other products.

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Animal Security

Animals providing security

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Idli and Dosa

In day to day houshold food items, ground rice and dal are allowed to stand for a few hours

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Gobar Gas

Excretory Waste products used to obtain manure and gas

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Curd (Dahi) Production

A process where lactose (milk sugar) is converted into lactic acid by bacteria like Lactobacillus, resulting in curd formation.

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Lactic Acid in Curd

Bacteria convert milk sugar into lactic acid, thickening milk. Cool storage slows bacteria, preventing excess sourness.

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Domestication

The systematic raising of animals for specific purposes.

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Domestication of Animals

Systematic raising/rearing of animals for food and products.

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Animal Husbandry Defined

Science branch focusing on feeding, health, and breeding of domestic animals.

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Milch (Milk-Yielding) Animals

Animals raised for their milk production.

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Techniques For Organic Farming

Involves crop rotation, animal/green manures instead of chemical fertilizers/pesticides.

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Organic Farming Definition

Growing without chemicals, reduces environmental harm, maintains soil health, but yields are lower.

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Traditional farming methods

Farmers use crop rotation, animal and green manures to make the soil more fertile

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How is curd made?

Adding a small amount of curd to warm milk introduces Lactobacillus bacteria.

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What is nitrogen fixation?

The process of converting atmospheric nitrogen to usable compounds in the earth.

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What are Biological Nitrogen Fixers?

Microbes that convert atmospheric nitrogen into compounds of Nitrogen that can be absorbed by plant roots.

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What are Root Nodules?

Swollen structures on legume roots housing nitrogen-fixing Rhizobium bacteria.

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What is Horticulture?

A branch of agricultural science focused on fruits, vegetables, and ornamental plants.

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List organic farming techniques

Introducing beneficial insects, rotating crops, companion planting, and using organic pesticides.

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What is animal husbandry?

Systematic production of livestock for human needs.

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Why is milk important

Major source of protein and vitamins in the diet.

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Indian breeds of cow

Breeds yielding high quantity and quality of milk – Red Sindhi and Sahiwal.

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Sustaining Agriculture

Using compost, avoiding synthetic fertilizers to maintain soil, plant, and animal health.

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Cheese Production

Milk product made using bacteria for curdling.

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Yogurt Microbes

Commercial yogurt with Staphylococcus cultures during production.

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Lactobacillus in Yogurt

A bacteria that contributes to flavor and aroma in commercial yogurt production.

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India & Agriculture

A country vastly known as agricultural country.

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Viral infection disease

Viral disease in cattle.

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Ox and elephant

Animals that are used for work or transport

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Study Notes

  • Bacteria characteristics are employed in the preparation of food products like curd, cheese, butter, and yogurt.

Uses of Bacteria

  • Bacteria aids in increasing soil fertility in agriculture.
  • Bacteria are used in the production of alcohol, wine, and vinegar (acetic acid).
  • Antibiotics and vaccines are produced with bacteria in medicine.

Curd (Dahi) Production

  • Making curd converts lactose (milk sugar) into lactic acid by bacteria, mainly Lactobacillus.
  • A small amount of curd is added to warm milk to make fresh curd.
  • Lactobacillus starts growing in warm milk, converting lactose into lactic acid, thickening the milk until it becomes curd.
  • Cooling curd reduces further bacterial growth, preventing it from becoming too sour due to excessive lactic acid.
  • Curd contains millions of Lactobacillus bacteria, promoting curd formation.
  • Bacteria require ambient temperature to grow in milk.
  • Curd is produced by the fermentation of whole milk.

Investigation 8.1

  • Bacteria require ambient temperature to grow in milk.
  • Curd forms in container B (warm milk) only.
  • In containers A (cold milk) and C (boiling hot milk), bacteria failed to grow due to extreme temperature.

Yogurt Production

  • Commercial yogurt uses milk with at least one-fourth of the water evaporated in a vacuum pan.
  • It requires Staphylococcus and Lactobacillus mixed culture.
  • Staphylococcus primarily produces acid, while Lactobacillus contributes to flavor and aroma.

Cheese Production

  • Cheese is a nutritious milk product rich in proteins, fats, calcium, and vitamins.
  • The first step in cheese making, curdling, requires bacteria.
  • The curd obtained is processed to remove moisture, and then processes like salting and ripening are carried out.
  • Salting prevents harmful microorganism growth, and ripening imparts a particular flavor to cheese.

Tea Production

  • Curing of tea uses bacteria.
  • Curing removes bitterness from tea leaves and enhances flavor and aroma.

Increasing Soil Fertility

  • Certain bacteria and blue-green algae can fix nitrogen from the air.
  • Microbes are called biological nitrogen fixers, converting elemental nitrogen to compounds plants can absorb.
  • Soil is enriched with nitrogen compounds, increasing its fertility.

Nitrogen Fixation

  • Converting atmospheric nitrogen into compounds of nitrogen, is carried out by bacteria and blue-green algae.

Rhizobium in Root Nodules

  • Rhizobium lives in root nodules of leguminous plants (e.g., beans, peas).
  • This relationship is symbiotic.
  • Nitrobacter and Nitrosomonas are also nitrogen-fixing bacteria.
  • Roots of leguminous plants (pulses) like beans and peas bear root nodules.

Commercial Uses of Fungi

  • Fungi are unicellular or multicellular organisms lacking chlorophyll.
  • Yeast and mushrooms are widely used in the food industry.
  • Mushrooms are rich in protein, vitamin B, vitamin D, and minerals.
  • Yeast is rich in amino acids and proteins and is used in bakery products.
  • Fungi can increase soil fertility and recycle nutrients.
  • Fungi help produce wine and beer.
  • Antibiotics such as penicillin require fungi.
  • Mushrooms are edible and rich in proteins.

Bread Making

  • Yeast is added to uncooked dough to make the dough rise due to carbon dioxide production.

Investigation: Bread Making

  • Dough rises due to carbon dioxide gas production by yeast.

Agriculture Basics

  • Agriculture grows plants and raises animals useful to humans.
  • It includes the cultivation of land, breeding, and management of crops and animals.
  • Fields require preparing the soil, sowing seeds, and watering (irrigation).
  • Harvesting and storing crop grains are key agricultural activities.
  • Tools for cultivation are agricultural implements.

Crop Plants

  • Plants grown and cared for in a field are crop plants.
  • Crops include cereals (wheat, maize, rice), pulses (pea, gram), oil crops (groundnuts), and fiber crops (cotton).
  • The product which we obtain from a crop is called the produce.
  • Farmers cultivate various food crops like cereals, vegetables and fruits.

Crop Classification

  • Cereals: Wheat, rice, maize, barley
  • Pulses: Pea, gram, bean, soybean
  • Oil seeds: Mustard, groundnut, sunflower
  • Tuber crops: Potato, tapioca
  • Sugar crops: Sugarcane, beetroot
  • Plantation crops: Coffee, tea, rubber, coconut
  • Fiber crops: Cotton, jute, hemp
  • Spices: Pepper, clove, coriander, turmeric
  • Timber: Teak, shisham, pine

Cash vs. Food Crops

  • Cash crops are for sale to earn money (e.g., cotton, sugarcane, rubber, tea, coffee, jute, teak).
  • Food crops are for food production.
  • Crops produced for sale to earn money, rather than for use by the grower are cash crops

Seasonal Crops

  • Rabi crops grow in winter, harvested in spring (e.g., wheat, mustard, gram, barley).
  • Kharif crops grow in monsoon, harvested in autumn (e.g., rice, maize, sugarcane, millets).
  • Crops grown during the winter season and harvested in spring are Rabi crops
  • Crops grown during monsoon and harvested during autumn are Kharif crops

Horticulture

  • Horticulture: growing vegetables, flowers, fruits, ornamental plants, spices, etc.
  • Horticulture aims to produce better varieties of fruits, vegetables, and flowers in large quantities.
  • Horticulture is a branch of science that deals with growing vegetables, flowers fruits, ornamental plants, spices, etc.

Horticultural Crop examples

  • Vegetables: potato, tomato, brinjal, cabbage, onion, spinach, lady’s finger, radish, beetroot, turnip, beans
  • Fruits: apple, banana, orange, grapes, guava, mango, papaya, pineapple
  • Flowers: rose, jasmine, gladiolus, marigold, larkspur, balsam
  • Ornamental plants: cactus, crotons, bamboo, china palm, ferns
  • Ornamental trees: thuja, christmas tree, Bottlebrush tree, royal palm, Ashoka tree, fishtail palm

Organic Farming

  • No chemical fertilizers and pesticides are used.
  • Uses crop rotation, animal and green manures.

Advantages of Organic Farming

  • Products are free from chemical fertilizers and pesticides.
  • No land and water pollution.
  • Helps recycle farm wastes.
  • Maintains soil fertility.

Disadvantages of Organic Farming

  • Foods are more expensive.
  • Shorter shelf-life than non-organic foods.
  • Tedious and labor-intensive.

Green Revolution

  • An increase in crop and food grain production resulted from chemical fertilizers, pesticides, and HYVs (high-yielding varieties) of major crops.
  • Developing high-yielding varieties (HYV) and disease-resistant varieties of major crops caused the Green Revolution

Factors of the Green Revolution

  • Development and introduction of high-yielding varieties.
  • Development of early-maturing varieties.
  • Multiple cropping.
  • Development of disease-resistant varieties.
  • Development of drought-resistant varieties.
  • Use of fertilizers and pesticides.
  • Development of dwarf varieties that do not fall down.

Animal Husbandry

  • Feeding, shelter, health, and breeding of domestic animals make up Animal husbandry.
  • Systematic rearing of animals for food and other products.
  • Domestication is the process of keeping animals for specific purposes.
  • All domestic useful animals constitute livestock.
  • Cattle, buffaloes, sheep, pigs and camel constitute the livestock wealth.

Animal Categories

  • Milk-yielding (milch) animals: cow, buffalo, goat, sheep.
  • Flesh-yielding animals: goat, sheep, pig, poultry.
  • Draught animals: horse, camel, elephant, ox, ass.
  • Fiber-yielding animals: sheep, goat, pig.
  • Hide-yielding animals: sheep, goat, buffalo, camel.
  • Honey-yielding animals: honeybees.
  • Silk-yielding animals: silkworm.
  • Egg-yielding animals: chicken, domestic fowl, duck, turkey.

Other Animal Uses

  • Dogs provide security.
  • Moths, butterflies, and bees help in pollination.
  • Excretory wastes (gobar) are manure and gobar gas.
  • Gobar gas is for cooking and lighting.
  • Cowdung cakes are fuel in rural areas.

Milk-Yielding Animals

  • Cows and buffaloes are major milk-yielding animals.
  • Milk is rich in proteins and vitamins.
  • In small quantities, milk is also obtained from goat, sheep and camel

Cattle Diseases

  • Cowpox: viral disease.
  • Foot and Mouth disease: viral disease.
  • Anthrax: bacterial disease.

Milch Breeds of Cow

  • Indian/indigenous breeds: Red Sindhi, Sahiwal, Gir.
  • Foreign/exotic breeds: Brown Swiss, Jersey, Holstein Friesian.
  • These breeds yield high quantity and quality of milk

Other Uses for Yeast

  • Yeast finds its use in day-to-day household food items like idli and dosa.
  • Yeast cells cause the mixture of ground rice and dal to rise and become sour when making idli and dosa.
  • Saprophytic bacteria release nutrients to the soil, thereby helping in cleaning the earth and bringing about cycling of nutrients

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