Tag: soil as a natural resource

Questions Related to soil as a natural resource

The lower limit of water availability is soil is known as

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

  1. Field capacity

  2. Hypolimnion

  3. Thermocline

  4. Wilting point

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Correct Option: D

Which one is the main source of minerals essential for man and other organisms?

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

  1. Lithosphere

  2. Ionosphere

  3. Mesosphere

  4. Stratosphere

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Correct Option: A
Explanation:

The lithosphere serves as a source of minerals. The minerals supply the basic materials, required for making a variety of commodities, which man uses daily. The lithosphere is also the major source of fuels, such as coal, petroleum and a natural gas. 

The lithosphere in combination with the hydrosphere and the atmosphere plays a vital role in the growth of plants and animals. It provides nutrients to the plants. The plants are the source of food for man and all other animals.

Materials of biological origin which are commonly used to maintain and improve soil fertility are 

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

  1. green manures

  2. biofertilizers

  3. bioinsecticides

  4. both (a) and (b).

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Correct Option: D
Explanation:

Green manures are added to the soil to increase the productivity. Manures is of natural origin. The presence of nutrients in manure have a great role in increasing soil fertility. Biofertilizers are organisms which enrich the soil with nutrients e.g., Rhizobiumin symbiotic association with legume plants.

Soil is a component of

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

  1. Lithosphere

  2. Hydrosphere

  3. Atmosphere

  4. None of above

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Correct Option: A
Explanation:

Lithosphere is the outer solid crust of Earth, which we call land. Its upper weathered part forms the soil.

When large patches of forests are being cleared for cultivation of crops, the environmental impact of such a practice would lead to______

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

  1. Soil erosion

  2. Soil conservation

  3. Soil pollution

  4. Soil fertility

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Correct Option: A
Explanation:

 Deforestation is a direct cause of the erosion happening in tropical rain forests. Once plant cover is gone there are no roots to hold the soil in place during heavy tropical rains, which then wash away the topsoil and the nutrients necessary to regenerate future vegetation.

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

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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

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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