Tag: evs

Questions Related to evs

.......... soil holds highest water capacity.

evs soil- our life horizons of soil soil - formation and profile soil-nature

  1. Sandy

  2. Clayey

  3. Loamy

  4. Both A and C

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Correct Option: B
Explanation:

Clay particles are extremely small in size. They also have a large surface area owing to their small sizes. So they can absorb a large amount of water. Apart from this, clay particles also have very little space between their particles. So, their water retention capacity is also less. 

Sandy soil has large particles, less surface area, less absorption, and water holding capacity. As a result, they can retain less amount of water.
So, option B "Clayey " soil is the correct answer.

.......... soil holds plenty of air.

evs soil- our life horizons of soil soil - formation and profile soil-nature

  1. Sandy

  2. Clayey

  3. Silt

  4. Both B and C

Show answer
Correct Option: A
Explanation:

Sandy soil has large-sized particles. These particles are loosely bound to each other. Apart from this, they also have large interparticle spaces between them. A lot of air can be trapped in this space. Same is the case with silt. Its particles are water holding capacity is more.

Clay has very small particles with great water holding capacity.
So, option A "Sandy" is the correct option.

In the soil profile, which layer is harder and more compact?

evs soil- our life horizons of soil soil - formation and profile soil-nature

  1. Bedrock

  2. Subsoil

  3. Surface soil

  4. Parent rock

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Correct Option: A
Explanation:

Bedrock is the lowermost layer of soil. It lies beneath the soil layers. It is hard and made of rocks. Its constituents are tightly bound to each other. 

The subsoil is formed by the horizon B. Layer C forms the parent material.
Surface soil is the upper layer of soil that withers away easily under the effect of water, air etc causing soil erosion.
So, option A " Bedrock" is the correct answer.

........... is the collective name for layers of soil.

evs soil- our life horizons of soil soil - formation and profile soil-nature

  1. A-horizon

  2. B-horizon

  3. C-horizon

  4. Soil profile

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Correct Option: D
Explanation:

Soil is arranged in various layers. These layers collectively form the entire structure of the soil. This is called a soil profile. The soil profile is made up of different layers, called horizons. A soil horizon is a layer of soil that runs parallel to the soil surface. Each of the layer has different and specific characteristics that are different from the other layers.

So, option D " Soil Profile" is the correct answer. 

Soil building begins with the physical fragmentation of

evs soil- our life horizons of soil soil - formation and profile soil-nature

  1. Lichens

  2. Humus

  3. Aggregate

  4. Parent material

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Correct Option: D
Explanation:
The development of a soil would begin with the weathering of lava flow bedrock, which would produce the purely mineral-based parent material from which the soil texture forms. Soil development would proceed most rapidly from bare rock of recent flows in a warm climate, under heavy and frequent rainfall. This The mineral material from which a soil forms is called parent material. Rock, whether its origin is igneous, sedimentary, or metamorphic, is the source of all soil mineral materials and the origin of all plant nutrients with the exceptions of nitrogen, hydrogen and carbon. As the parent material is chemically and physically weathered, transported, deposited and precipitated, it is transformed into a soil.
So, the correct answer is 'Parent material'.

The dead rotting matter which is found in the water floating on the top layer belongs to 

evs soil- our life horizons of soil soil - formation and profile soil-nature

  1. Matter

  2. Clay

  3. Humus

  4. Sand

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Correct Option: C

The study of the vertical section of the layers of the soil is known as 

evs soil- our life horizons of soil soil - formation and profile soil-nature

  1. Soil study

  2. Soil profile

  3. Soil layering

  4. Soil weathering

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Correct Option: B
Explanation:
A soil profile consists of multiple horizontal layers of soil called horizons. Horizons occur parallel to each other. Each horizon is distinct from the other with respect to age, texture, color etc, these horizons can be observed when the soil layers are dug through vertically
So, the correct answer is 'Soil profile'

Weathering is the process of

evs soil- our life horizons of soil soil - formation and profile soil-nature

  1. Formation of rock

  2. Formation of soil

  3. Formation of humus

  4. All of the above

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Correct Option: B

The layer of humus in the soil profile is observed at

evs soil- our life horizons of soil soil - formation and profile soil-nature

  1. The lowermost layer of the soil

  2. The topmost layer of the soil

  3. The soil layer beneath the clay

  4. The soil layer above the sand

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Correct Option: B

The soil layer is made up of :

evs soil- our life horizons of soil soil - formation and profile soil-nature

  1. R Horizon

  2. A Horizon

  3. B Horizon

  4. C Horizon

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Correct Option: A
Explanation:

The soil layer is made up of R Horizon It is only between $5$ to $10$ inches thick and consists of organic matter and minerals. This layer is also called subsoil.