Important Questions for Class 9 Science - Chapter 12
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Questions and Answers

Which of the following is a desired agronomic trait for cereal crops?

  • Profuse branching
  • Tallness
  • Dwarfness (correct)
  • Large seed size

What is the main goal of mixed cropping?

  • Boosting productivity per square foot
  • Preserving soil fertility
  • Saving space and time
  • Reducing crop failure (correct)

Which of the following nutrient is NOT considered a macronutrient for plants?

  • Iron (correct)
  • Phosphorus
  • Potassium
  • Nitrogen

Which of the following is not a benefit of organic farming?

<p>Increased yield compared to conventional farming (B)</p> Signup and view all the answers

What is the primary source of carbon for plants?

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

Which of the following is a key difference between intercropping and mixed cropping?

<p>Intercropping involves planting in rows, while mixed cropping does not. (C)</p> Signup and view all the answers

Which of the following is a characteristic of manure that distinguishes it from fertilizers?

<p>Manure contains a high amount of organic matter. (A)</p> Signup and view all the answers

What is a potential downside of excessive use of chemical pesticides on crops?

<p>Pollution of the environment. (B)</p> Signup and view all the answers

What is the main goal of preparing green manure?

<p>Increasing the amount of nitrogen in the soil (C)</p> Signup and view all the answers

What is the recommended approach for protecting crops?

<p>Employing preventive measures and biological control methods. (A)</p> Signup and view all the answers

Which of the following is NOT an advantage of poultry farming over cattle farming?

<p>Poultry farming is generally more labor-intensive. (D)</p> Signup and view all the answers

Which of the following is a characteristic of Kharif crops?

<p>They are harvested in the summer season. (B)</p> Signup and view all the answers

What is the primary advantage of cross-breeding for improving cattle breeds?

<p>Introducing new genetic traits. (C)</p> Signup and view all the answers

Which of the following is NOT a desired agronomic trait for fodder crops?

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

What is the primary benefit of intercropping?

<p>Increased productivity per unit area (D)</p> Signup and view all the answers

What is the process of hybridization in plants?

<p>Cross-breeding plants with different genetic makeup (D)</p> Signup and view all the answers

What is the key difference between aquaculture and mariculture?

<p>Mariculture focuses solely on cultivating marine organisms, while aquaculture includes freshwater species. (D)</p> Signup and view all the answers

Which of the following practices is an example of capture fishing?

<p>Using nets to catch wild fish in the ocean. (C)</p> Signup and view all the answers

How does genetic manipulation contribute to agricultural practices?

<p>All of the above. (D)</p> Signup and view all the answers

Which of the following is NOT a benefit of genetic manipulation in agricultural practices?

<p>Introduction of new, potentially harmful allergens into the food supply. (B)</p> Signup and view all the answers

What is the primary goal of both aquaculture and mariculture?

<p>To provide a sustainable source of food for human consumption. (B)</p> Signup and view all the answers

Which of these agricultural practices involves growing plants and then plowing them into the soil while still green?

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

Which of the following IS NOT a preventive measure for storing grains?

<p>Using old gunny bags to conserve resources (B)</p> Signup and view all the answers

Which of the following is a method of increasing crop yields through crop variety management?

<p>Employing hybridization techniques (C)</p> Signup and view all the answers

What is the primary role of hatcheries in freshwater fisheries?

<p>Breeding and raising fish for food (C)</p> Signup and view all the answers

Which of the following is NOT a plant used as a green manure?

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

Which of the following is a benefit of beekeeping?

<p>It provides an additional source of income for farmers (B)</p> Signup and view all the answers

Which of the following is NOT a method of improving crop production management?

<p>Introducing new plant species to the ecosystem (D)</p> Signup and view all the answers

What is the primary purpose of draught breeds of cattle?

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

Which cropping pattern involves growing two or more crops simultaneously on the same land?

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

What is the benefit of intercropping regarding nutrient requirements?

<p>It reduces competition for nutrients between different crops. (A)</p> Signup and view all the answers

Which of the following is a symptom of a diseased animal?

<p>Excessive saliva production (A)</p> Signup and view all the answers

What is a primary reason for implementing crop rotation?

<p>To prevent the buildup of pests and diseases in the soil. (C)</p> Signup and view all the answers

What is the main difference between mixed cropping and intercropping?

<p>Mixed cropping involves growing different crops simultaneously, while intercropping involves growing different crops in a specific sequence. (A)</p> Signup and view all the answers

What is the advantage of crop rotation in relation to moisture and irrigation?

<p>It allows for the selection of crops based on their specific water requirements. (A)</p> Signup and view all the answers

What is the meaning of the phrase "dual-purpose breeds" as applied to cattle?

<p>Breeds that are used for both beef and dairy production. (D)</p> Signup and view all the answers

What is the main advantage highlighted in the passage regarding poultry's role in food conversion?

<p>Poultry can efficiently convert low-value agricultural waste into high-value protein. (B)</p> Signup and view all the answers

What are the primary factors considered for successful management practices in both dairy and poultry farming?

<p>Maintaining optimal feed intake, providing adequate shelter, and protecting animals from diseases and climate. (A)</p> Signup and view all the answers

What is the primary difference in the diet of broiler chickens compared to layer chickens?

<p>Broilers require more protein and fat than layers because of their rapid growth. (C)</p> Signup and view all the answers

Which of the following is NOT a management practice common in dairy and poultry farming?

<p>Feeding a diet high in fiber for better digestibility (B)</p> Signup and view all the answers

Why is crossbreeding between native and exotic dairy breeds potentially beneficial?

<p>To produce animals with desirable traits from both parent breeds. (D)</p> Signup and view all the answers

Which of the following statements about the efficiency of poultry in food conversion is TRUE?

<p>Poultry can efficiently convert even low-quality food sources into protein. (C)</p> Signup and view all the answers

What is the main advantage of composite fish culture?

<p>It is a more efficient and sustainable way to raise fish. (B)</p> Signup and view all the answers

Which of the following is NOT a way that fish are obtained?

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

Flashcards

Dwarfness in cereal crops

Dwarfness helps cereal crops use fewer nutrients efficiently.

Traits for fodder crops

Tallness and branching are ideal for fodder crops for maximizing leaves.

Macronutrients

Six essential nutrients required in large amounts for plant growth: nitrogen, phosphorus, potassium, calcium, magnesium, and sulphur.

Plant nutrient sources

Plants obtain nutrients from air, water, and soil, including various minerals.

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Manure vs. Fertilizers

Manure is organic and made from animal waste; fertilizers are commercial chemical compounds.

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Impact of manure

Manure adds organic matter and improves soil fertility slowly over time.

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Preventive measures in crop protection

Preventive methods like crop rotation and careful preparation are better than using chemicals.

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Cross breeding

Cross breeding is the primary method used for improving cattle breeds.

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Green manure

Decomposed green plants mixed into soil to enhance fertility.

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Poultry farming advantages

Poultry farming requires less money, space, and maintenance than cattle farming.

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Intercropping

Cultivating two or more crops simultaneously in the same field.

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Benefits of organic farming

Organic farming preserves the environment, soil fertility, and avoids harmful chemicals.

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Mixed cropping vs Intercropping

Mixed cropping mixes seeds, while intercropping plants in rows for higher productivity.

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Rabi crops

Crops sown in winter requiring a cool, dry climate.

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Kharif crops

Crops sown in summer needing a hot, humid environment.

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Hybridization

The process of crossing genetically distinct plants to create new varieties.

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Capture Fishing

A technique for catching fish from natural sources.

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Mariculture

Marine culture fisheries maintained in marine waters for breeding and rearing.

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Aquaculture

Cultural fisheries kept in fresh or saltwater for raising aquatic creatures.

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Genetic Manipulation

A technique for improving crop plants to achieve desired traits.

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Benefits of Genetic Manipulation

Includes higher yields, disease resistance, and faster maturation in crops.

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Draught breeds

Cattle used for labor, often called bullocks.

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Dual purpose breeds

Cattle that provide both milk and labor.

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Dairy breeds

Cattle specifically raised for milk production.

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Symptoms of diseased animals

Signs such as lethargy, isolation, and abnormal excretion.

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Mixed cropping

Growing two or more crops on the same land simultaneously.

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Crop rotation

Planting different crops in a planned order over time.

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Advantages of intercropping

Increases efficiency and reduces risk of crop failure.

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Hatcheries

Nurseries where fish eggs or fish seed are placed in freshwater.

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Swarming

The process where a new queen bee leaves the hive to find a new home for reproduction.

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Green Manuring

The process of growing herbaceous plants, ploughing them, and mixing with the soil while they are green.

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Examples of Green Manures

Plants like sun hemp, cluster bean, lentil, and cowpea used for green manuring.

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Preventive Measures for Grain Storage

Methods to ensure grain quality, including drying and hygiene maintenance.

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Crop Production Management

A method to increase crop yield through proper irrigation and fertilizer use.

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Exotic Breeds in Dairy

Foreign breeds like Jersey and Brown Swiss bred for long lactation.

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Native Breeds in Dairy

Local breeds such as Red Sindhi and Sahiwal bred for disease resistance.

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Crop Protection Management

Techniques to protect crops from pests, including biological, chemical, or cultural methods.

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Poultry Efficiency

Poultry converts low-fiber food into nutritious protein, mainly through waste food.

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Advantages of Bee-Keeping

Benefits include low investment and additional income for farmers.

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Management Practices in Dairy and Poultry

Common practices include food requirements, hygiene, and protection from climate and diseases.

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Broilers

Chickens bred for meat, requiring rich supplements for growth.

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Layers

Chickens bred for egg production, having different dietary needs than broilers.

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Cultural Fishery

Fish farming that involves rearing and breeding of selected fish species.

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Study Notes

Important Questions for Class 9 Science - Chapter 12

  • Cereals, Pulses, Fruits, and Vegetables: Cereals provide carbohydrates, pulses provide protein, and fruits and vegetables provide vitamins and minerals.

  • Grain Storage Losses: Grain losses during storage are caused by both biotic (e.g., rodents, bacteria, fungi, insects) and abiotic (e.g., humidity, temperature, moisture content) factors.

  • Weeds: Weeds are undesired plants that grow in fields, examples include Amaranthus and Chenopodium.

  • Crop Rotation: Crop rotation is an agricultural technique that involves alternating different crops in a planned succession on the same land.

  • Drones in Agriculture: Drones are airborne devices used in agriculture to increase crop output and track crop growth. They help with water, fertilizer, herbicide, and seed applications, increasing efficiency and reducing costs.

  • Pasturage: Pasturage is the availability of flowering plants that bees can collect nectar and pollen. The type of flowers affects honey flavor.

  • Poultry Farming vs Cattle Farming: Poultry farming (chicken) is often more economical, requiring less space and capital than cattle farming.

  • Intercropping: Intercropping involves cultivating two or more crops simultaneously in the same field, in rows or blended together. It increases productivity by optimizing the use of resources.

  • Mixed Cropping: Mixed cropping involves cultivating two or more crops simultaneously on the same field, but seeds are blended together.

  • Rabi and Kharif Crops: Rabi crops are sown in the winter, while Kharif crops are sown in the summer.

  • Hybridization: Hybridization is the process of crossing distinct plant varieties to create new varieties with desirable traits, such as high yields or disease resistance.

  • Weed Control Methods: Weed control methods include mechanical removal (using tools), cultural methods (like crop rotation), and chemical methods (using compounds like 2,4-D).

  • Ideal Cattle Shelters: Ideal cattle shelters provide protection from rain, heat, and cold. They feature appropriate flooring for cleaning, safe water provisions, and proper waste disposal.

  • Fertilizer Hazards: Fertilizer application can negatively affect soil quality by decreasing organic matter and harming soil structure. Excessive use can also lead to water pollution through runoff.

  • Insect Pest Damage: Insects damage crops by eating leaves, stems, fruits, consuming sap, producing galls, and destroying stored grains.

  • Biotic and Abiotic Factors in Crop Production: Living organisms (biotic) such as bees and worms can benefit crops, while pests damage crops. Non-living factors (abiotic), such as climate, soil, water, and minerals, also influence crop production.

  • Desirable Agronomic Traits for Crop Improvement: Desired traits include high yield, disease resistance, tolerance to harsh environments, and faster growth, for greater efficiency.

  • Macronutrients and Plant Nutrition: Plants require sixteen essential nutrients. Nitrogen, phosphorus, potassium, calcium, magnesium, and sulfur are macronutrients required in large quantities.

  • Manure vs. Fertilizer: Manure is organic matter (animal waste or plant residue), providing organic matter while also supplying relatively low amounts of nutrients. Fertilizers are manufactured compounds delivering precise, high levels of nutrients.

  • Crop Production Methods for Increasing Yields: Includes techniques like correct irrigation, fertilizer application, crop rotation, intercropping, mixed cropping, good crop variety selection, and pest control.

  • Animal Husbandry: Practices are important to optimize animal health and productivity. Includes appropriate feeding, shelter, breeding, and disease management.

  • Pisciculture: Fish farming is the process of raising and cultivating fish in a controlled environment, increasing fish yield.

  • Beekeeping Benefits: Honey production and other products (like beeswax and royal jelly) are common benefits of beekeeping for farmers.

  • Capture Fishing, Aquaculture, and Mariculture: Three different methods to obtain fish: Capture fishing involves catching fish from natural sources; Aquaculture involves raising fish in ponds or tanks, while mariculture involves raising fish in saltwater.

  • Storage Grain Losses: Storage grain losses happen when microbes, rodents, and insects destroy grains.

  • Prevention of Grain Loss: Correct storage conditions and hygiene measures are essential in preventing grain loss. These include appropriate drying procedures and good storage facilities.

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CBSE Class 9 Science Chapter 12 Improvement in Food Resources PDF

Description

This quiz covers important concepts from Chapter 12 of Class 9 Science, focusing on topics like cereals, pulses, and the principles of crop rotation. It also delves into the impact of weeds and modern technology like drones in agriculture. Test your understanding of key agricultural practices and the science behind them.

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