Growth and Multiplication of Microorganisms
40 Questions
2 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

Which of the following is NOT a use of coke?

  • It is used as a reducing agent.
  • It is used in the manufacture of coal gas.
  • It is used in the production of biofuels. (correct)
  • It is used in the manufacture of steel.

    • What is referred to as 'Black Gold'?

  • Petroleum (correct)
  • Bitumen
  • Coal
  • Natural gas

    • Which of the following statements is incorrect?

  • Electricity is a renewable resource. (correct)
  • Wildlife is an exhaustible natural resource.
  • Oxygen in the air is an exhaustible natural resource.
  • CNG is a less polluting fuel than petrol and diesel.

    • Under what conditions are dead plants converted to coal?

    <p>Under high temperature and pressure.</p> Signup and view all the answers

    Which of the following is a suggested step for using fossil fuels judiciously?

    <p>We should use fossil fuels when necessary.</p> Signup and view all the answers

    What happens when air is passed through red hot coke?

    <p>It produces a gaseous fuel.</p> Signup and view all the answers

    Which of the following is an exhaustible natural resource?

    <p>Natural gas</p> Signup and view all the answers

    What is the primary use of bitumen?

    <p>For road surfacing</p> Signup and view all the answers

    What will be the effect of sowing wheat in the kharif season for Raghu?

    <p>Air in the soil will reduce because of rainfall and waterlogging.</p> Signup and view all the answers

    Why are Indian farmers concerned about the 'Terminator Seed Technology'?

    <p>It results in seeds that are sexually sterile.</p> Signup and view all the answers

    Which rabi and kharif crop combination will replenish the soil with nitrogen?

    <p>Pea and Soyabean</p> Signup and view all the answers

    What characteristic of the seeds in Akshat's pots will be affected by the soil amendments?

    <p>The type of soil amendment will influence the growth and germination of seeds.</p> Signup and view all the answers

    Which of the following plants is likely to show poor germination due to kharif conditions?

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

    What is a direct consequence of waterlogging in kharif season for crops?

    <p>Reduced germination rates for crops like wheat.</p> Signup and view all the answers

    Why might chemical fertilizers not be the best choice for Akshat's pots?

    <p>They can lead to soil degradation over time.</p> Signup and view all the answers

    What type of crop is typically cultivated during the rabi season?

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

    What is the metal present in the hormone insulin?

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

    Which non-metal is used in a purple color solution as an antiseptic?

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

    Which option represents the decreasing order of reactivity of the metals?

    <p>Potassium, calcium, lead, zinc</p> Signup and view all the answers

    Which type of soil is most conducive for microorganism growth?

    <p>Wet soil due to the presence of air and water</p> Signup and view all the answers

    What contributes to the high density of metals?

    <p>They have closely packed atoms.</p> Signup and view all the answers

    What is a recommended precaution for preventing seed insect infestations?

    <p>Rejecting unhealthy plants before sowing</p> Signup and view all the answers

    Which metal will not react completely with dilute sulphuric acid to form a salt and hydrogen gas?

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

    Which of the following is NOT a measure to increase crop yield?

    <p>Ignoring pest management strategies</p> Signup and view all the answers

    Which attributes should be considered while selecting seeds for sowing?

    <p>Freshly stored and disease-resistant</p> Signup and view all the answers

    What property of a metal is used to make musical instruments?

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

    Which statement about aluminium is incorrect?

    <p>It can only make covalent compounds.</p> Signup and view all the answers

    What is the primary role of fertilizers in agriculture?

    <p>To provide specific nutrients required by crops</p> Signup and view all the answers

    What happens in dry soil concerning microorganism growth?

    <p>Limits the presence of beneficial microorganisms</p> Signup and view all the answers

    Which reaction is feasible?

    <p>Zn + Cu²⁺ → Zn²⁺ + Cu</p> Signup and view all the answers

    Which agricultural practice can help control plant diseases?

    <p>Following suitable agricultural practices</p> Signup and view all the answers

    Which of the following seed attributes does NOT contribute to successful sowing?

    <p>Smaller seeds for less planting cost</p> Signup and view all the answers

    What is the term for the process in which a substance reacts with oxygen to produce heat?

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

    Which type of fuel can exist in solid, liquid, or gas forms?

    <p>Combustible fuel</p> Signup and view all the answers

    What is the lowest temperature at which a substance catches fire called?

    <p>Ignition temperature</p> Signup and view all the answers

    What are the three essential requirements for producing fire?

    <p>Fuel, air, and heat</p> Signup and view all the answers

    What happens to a vapor in a fractionating column when it reaches a height with a temperature equal to its boiling point?

    <p>Condenses to form a liquid</p> Signup and view all the answers

    Which of the following substances can easily catch fire with a flame?

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

    What is the term for the conversion of solid coal into gas?

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

    What may happen if one of the essential requirements for fire is removed?

    <p>Fire can be controlled</p> Signup and view all the answers

    Study Notes

    Growth and Multiplication of Microorganisms

    • Wet soil facilitates better growth of microorganisms as it holds more air and water, promoting multiplication.
    • Dry soil restricts air and water, slowing down microbial growth.
    • Loose soil increases microbial activity due to increased aeration and water retention.
    • Tight soil hinders growth as it lacks sufficient air and water.

    Seed Precautions Against Insects

    • Sowing seeds properly prevents insect infestations.
    • Healthy plants should be selected for sowing to minimize risk.
    • Implement timely inspections of storage to detect any infestations early.
    • Spraying chemicals beforehand can provide an additional layer of protection.

    Selecting Seeds for Sowing

    • Seeds should be clean and healthy, disease-resistant, and freshly stored.
    • Bigger seed size is preferable for better growth.
    • Selection should consider scientific methods for improved soil fertility and pest control.
    • Good quality seeds and awareness of new agricultural technology boost yield.

    Role of Fertilizers

    • Fertilizers provide specific nutrients essential for rapid crop development.
    • They are crucial for the overall health and growth of soil/crops.

    Impact of Mistaken Sowing

    • Sowing wheat in the kharif season leads to reduced air in the soil due to waterlogging.
    • Waterlogging can prevent germination of wheat seeds.

    Concerns with Terminator Seed Technology

    • Farmers are concerned as Terminator seeds lead to sterile plants that do not produce viable seeds.

    Crop Rotation for Nitrogen Replenishment

    • Practice crop rotation using legumes to replenish nitrogen in soil.
    • Example of suitable rabi and kharif crop combinations includes wheat with legumes like pea or soyabean.

    Properties and Uses of Coke

    • Coke is a fuel with a low impurity and carbon content, used in steel manufacturing and as a reducing agent.
    • It is not used for producing photographic materials.

    Fractionating Column in Distillation

    • Various fractions are obtained based on their boiling points during the distillation process.
    • Vapors condense into liquid at heights matching their boiling points.

    Combustion and Flame

    • Combustion involves a reaction between a combustible substance and oxygen producing heat.
    • Inflammable substances like petrol have low ignition temperatures and can easily catch fire.
    • Essential requirements for fire include fuel, air, and heat, any of which can be removed to control fire.

    Characteristics of Metals

    • Noble metals (e.g., gold, silver) resist reactions with air and water, maintaining their lustre.
    • Metals exhibit properties like ductility and malleability, important for applications like musical instruments.

    Reactivity of Metals

    • The order of reactivity in metals varies; potassium is the most reactive.
    • Certain metals (e.g., lead, calcium) do not react completely with dilute sulfuric acid.

    Aluminium Characteristics

    • Aluminium exhibits unique characteristics: it is malleable, ductile, and primarily forms covalent compounds.
    • It is extracted from its ore, bauxite.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    ISFO Science Practice Book Grade 8 2022 PDF

    Description

    This quiz explores the various factors influencing the growth and multiplication of microorganisms in different soil conditions. Participants will learn about the relationship between soil type and microbial activity, emphasizing the advantages and disadvantages of wet vs. dry soil. Test your understanding of how soil conditions affect microorganism growth!

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser