Tag: soil : our life

Questions Related to soil : our life

The type of soil which can hold water for more time have 

biology soil : our life soil properties soil - properties basics of soil pollution

  1. Lower percolation rate

  2. Higher percolation rate

  3. Intermediate percolation rate

  4. None of the above

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Correct Option: A
Explanation:

Percolation rate of a soil is the water absorption rate of the soil. It depends on the composition of the soil. It is different for different types of soil. Hence, it helps in selection of proper soil for the crop growth. Soil with lower percolation has high water retention capacity whereas soil with high percolation has low water retention capacity. Lower percolation rate refers that the soil can hold water for more time while higher percolation rate refers that the soil can hold water for less time. 

Thus, the correct answer is option A. 

The rate of water absorption by the soil defines the 

biology soil : our life soil properties soil - properties basics of soil pollution

  1. Rate of water movement

  2. Rate of seeping

  3. Rate of percolation

  4. Rate of absorption

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Correct Option: C
Explanation:

Percolation rate of a soil is the rate of water absorption by the soil. It depends on the composition of the soil. It is different for different types of soil. Hence, it helps in selection of proper soil for the crop growth. Soil with lower percolation rate has high water retention capacity whereas soil with high percolation rate has low water retention capacity. 

Thus, the correct answer is option C. 

The principal cation in alkaline soil is

biology soil : our life soil properties soil - properties basics of soil pollution

  1. $Na^{+}$

  2. $K^{+}$

  3. $Ca^{2+}$

  4. Either of these

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Correct Option: C

Physical and chemical conditions of soil are studied under

biology soil : our life soil properties soil - properties basics of soil pollution

  1. Topographic factors

  2. Edaphic factors

  3. Biotic factors

  4. Climatic factors

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Correct Option: B

Good soil is the one which

biology soil : our life soil properties soil - properties basics of soil pollution

  1. Allows water to percolate slowly

  2. Allows water to pass quickly

  3. Allows limited amount of water into it

  4. Holds whole of water entering it

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Correct Option: A

What is best pH of soil for cultivation?

biology soil : our life soil properties soil - properties basics of soil pollution

  1. 3.4 to 5.44

  2. 5 to 5.5

  3. 5.5 to 6.5

  4. 6.5 to 7.5

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Correct Option: C
Explanation:

The optimal pH range for cultivation is between 5.5 and 7.0

A fertile agricultural soil appears deep coloured at the surface as compared to soil one metre down. The reason for colour of top soil is

biology soil : our life soil properties soil - properties basics of soil pollution

  1. More moisture

  2. Rich in organic matter

  3. Rich in iron, calcium and magnesium

  4. Recent formation

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Correct Option: B

Top soil is darker and

biology soil : our life soil properties soil - properties basics of soil pollution

  1. Contains more Na and Mg

  2. Is drier than subsoil

  3. Contains more organic matter

  4. Is wetter than subsoil

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Correct Option: C

The principal cation in alkaline soil is 

biology soil : our life soil properties soil - properties basics of soil pollution

  1. Na$^+$

  2. K$^+$

  3. Ca$^{2+}$

  4. Any of the above

Show answer
Correct Option: C
Explanation:
  • Alkaline soils are clay soils with high pH, a poor soil structure and a low infiltration capacity.pH of alkaline soil is  > 8.5, 
  • The principal cation in alkaline soil is Ca2+ because alkaline soils are primarily caused by a calcium carbonate-rich parent material weathering (developing) in an arid or dry environment.
  • Hence the principal cation in alkaline soil is  Ca2+.
  • So, the correct answer is 'Ca2+'.

Soil salinity is measured by

biology soil : our life soil properties soil - properties basics of soil pollution

  1. Porometer

  2. Potometer

  3. Calorimeter

  4. Conductivity meter

Show answer
Correct Option: D
Explanation:

Soil salinity can be measured by conductivity meter, it is a device which measures electrical conductivity in a solution due to presence of salts or impurities

So, the correct answer is 'Conductivity meter'