Tag: soil - types, uses and need for conservation

Questions Related to soil - types, uses and need for conservation

Water holding capacity of the soil depends upon 

evs soil- our life soil profile soil and crops soil - types, uses and need for conservation

  1. Chemical composition of soil

  2. Particle size of soil

  3. Aggregation of soil particle

  4. All of these

Show answer
Correct Option: D
Explanation:

The quantity of water soil can retain after flowing down of the gravitational water is called its filled capacity or water holding capacity. Its depends on chemical composition of the sol which means types of ions present and hence pH of the soil . Size of sol particles and their aggregation form pores in soil. Large pores take part in percolation of water in the soil but small pores hold water by capillarity. 

So, the correct answer is 'All of the above'.

An area of soil is thoroughly wefted and allowed to drain until capillary movement of water stopped. The water contents of the soil will give an estimate of its

evs soil- our life soil profile soil and crops soil - types, uses and need for conservation

  1. Capillary water

  2. Storage water

  3. Field capacity

  4. Gravitational water

Show answer
Correct Option: C
Explanation:

(c) The amount of water retained by a unit weight of undisturbed soil after complete drainage under controlled coniditions is called field capacity or holard.

Consider the following fungi:
1. Arthrobotrys oligospora
2. Dactylella cionopaga
3. Streptorrryces rimosus
Which of these are predaceous for the biological control of nematodes in soil?

evs soil- our life soil profile soil and crops soil - types, uses and need for conservation

  1. 1 and 2

  2. 1 and 3

  3. 2 and 3

  4. 1, 2 and 3

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Correct Option: A

The best type of soil for agriculture is

evs soil- our life soil profile soil and crops soil - types, uses and need for conservation

  1. Clay

  2. Slit

  3. Loam

  4. Sand

Show answer
Correct Option: B
Explanation:

Explanation: Silt is granular material of a size somewhere between sand and clay, whose mineral origin is quartz and feldspar. Silt may occur as a soil or as sediment mixed in suspension with water (also known as a suspended load) in a body of water such as a river. Silty soil is usually more fertile than other types of soil, meaning it is good for agriculture.

Wheat is grown in the clayey soil because

evs soil- our life soil profile soil and crops soil - types, uses and need for conservation

  1. The soil contain more nitrogen

  2. The soil contain more phosphorous

  3. The soil contains humus

  4. Both A and B

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Correct Option: D

The best soil for gram is

evs soil- our life soil profile soil and crops soil - types, uses and need for conservation

  1. Clayey soil

  2. Sandy soil

  3. Loamy soil

  4. Both A and C

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Correct Option: D

Which of the following is the correct order of increasing size of the grains of soil particles?
A. Clay
B. Silt
C. Sand
D. Gravel

evs mud and stones soil types types of soil soil - types, uses and need for conservation

  1. B, C, A, D

  2. D, C, A, B

  3. A, B, C, D

  4. C, D. B, A

Show answer
Correct Option: C
Explanation:

The correct order of the increasing size of soil particle is-

Clay is the finest of all the particles then slit which has slightly larger particles than clay. Sand has bigger particles and gravel has the largest particle size.
Show the correct option is 'A, B, C, D'

The soil with poorest water holding capacity is

evs mud and stones soil types types of soil soil - types, uses and need for conservation

  1. Clayey

  2. Loamy

  3. Sandy

  4. None of above

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Correct Option: C

Soil provides home to which of the following animals?

evs mud and stones soil types types of soil soil - types, uses and need for conservation

  1. Rat

  2. Earthworm

  3. Rabbit

  4. All of these

  5. None of these

Show answer
Correct Option: D
Explanation:

The upper layer of earth in which plants grow, a black or dark brown material typically consisting of a mixture of organic remains, clay, and rock particles. It provides home to variety of microscopic and macroscopic organisms.

So, the correct option is 'All of these'. 

Salinization is _____________

evs mud and stones soil types types of soil soil - types, uses and need for conservation

  1. Accumulation of salts in water

  2. Accumulation of salts in soil

  3. Accumulation of salts in body

  4. Accumulation of salts in animals

Show answer
Correct Option: B