Tag: evs

Questions Related to evs

The four main bases in a soil are

evs mud and stones importance of soil in agriculture soil - formation, profile and properties soil as a natural resource

  1. Calcium, magnesium, sodium and potassium

  2. Vitamins A, B, C and D

  3. Nitrogen, Phosphorus, Iron and Potassium

  4. Magnesium, Vanadium and Iron and Aluminum

Show answer
Correct Option: C
Explanation:

As rock becomes broken down through a variety of processes, such as weathering and erosion, the particles become ground smaller and smaller. The four main bases in a soil are Nitrogen, Phosphorus, Iron and Potassium.

The soil is a complex mixture of

evs mud and stones importance of soil in agriculture soil - formation, profile and properties soil as a natural resource

  1. Soil biota

  2. Eroded rock

  3. Gases and water

  4. All of the above

Show answer
Correct Option: D
Explanation:
  • The soil is the mixture of minerals, organic matter, gases, liquids, and the countless organisms that together support life on Earth. 
  • The soil is a natural body known as the pedosphere and which performs four important functions. It is a medium for plant growth. 
  • It is a means of water storage, supply, and purification. 
  • It is a modifier of Earth's atmosphere. 
  • It is a habitat for organisms, all of which, in turn, modify the soil.
So the correct answer is 'All of the above'.

What is a soil horizon?

evs mud and stones importance of soil in agriculture soil - formation, profile and properties soil as a natural resource

  1. A factor influencing how soil is formed

  2. A layer of soil

  3. An organism found within the soil

  4. A technique used to map soils

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Correct Option: B
Explanation:

Explanation: Virtually all soil profiles are composed of a number of distinctive layers, termed horizons, interpretation of which is the key to understanding how the soil has formed.

The component of environment which is essential for agriculture is

evs mud and stones importance of soil in agriculture soil - formation, profile and properties soil as a natural resource

  1. Air

  2. Fertilizers

  3. Soil

  4. None of the above

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Correct Option: C

The renewable natural resource is

evs mud and stones importance of soil in agriculture soil - formation, profile and properties soil as a natural resource

  1. Petrol

  2. Coal

  3. Soil

  4. None of the above

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Correct Option: C

The circulation of oxygen in various form through nature is called as

evs bio-geo chemical cycles in nature nutrient cycles- flow of substances carbon cycle biogeochemical cycles - gaseous

  1. Respiration

  2. Circulation

  3. Oxygen cycle

  4. All of the above

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Correct Option: C

.......... oxygen is present in the atmosphere.

evs bio-geo chemical cycles in nature nutrient cycles- flow of substances carbon cycle biogeochemical cycles - gaseous

  1. 78%

  2. 21%

  3. 3%

  4. 1%

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Correct Option: B

Who discovered oxygen?

evs bio-geo chemical cycles in nature nutrient cycles- flow of substances carbon cycle biogeochemical cycles - gaseous

  1. Priestley

  2. Winogradsky

  3. Humphry

  4. None of the above

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Correct Option: A

True or False:
Burning of fossil fuels liberate oxygen.

evs bio-geo chemical cycles in nature nutrient cycles- flow of substances carbon cycle biogeochemical cycles - gaseous

  1. True

  2. False

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Correct Option: A

Which gas is likely to be reduced in the atmosphere by deforestation?

evs bio-geo chemical cycles in nature nutrient cycles- flow of substances carbon cycle biogeochemical cycles - gaseous

  1. Carbon dioxide

  2. Nitrogen

  3. Oxygen

  4. Sulphur dioxide

Show answer
Correct Option: C