Tag: biology

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Multiple choice biology the soil soil erosion (geo) soil erosion, soil conservation and uses of soil soil erosion and conservation

Deforestation causes

  1. Soil erosion

  2. Soil pollution

  3. Water pollution

  4. Noise pollution
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In deforestation, there is the cutting or the removal of plants. The roots of the plants allow the soil to be held due to the presence of water. Due to deforestation, the water present in the soil gets evaporated resulting in a barren land. This barren land is prone to soil erosion which results in the loss of the upper layer of the soil. When new trees are planted, the soil erosion can be prevented. 

Thus, the correct answer is option A. 

Multiple choice biology the soil soil erosion (geo) soil erosion, soil conservation and uses of soil soil erosion and conservation

Soil erosion is due to

  1. Fast running rivers

  2. Heavy rains

  3. Occasional rains

  4. Wind
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The process of soil erosion is the washing away of the upper fertile layer of the soil. The roots of the trees and plants are responsible for holding the soil. When there is heavy rain and there are no plants in the area, the layer of the soil gets carried away along with the water. 

Thus, the correct answer is option B. 

Multiple choice biology the soil soil erosion (geo) soil erosion, soil conservation and uses of soil soil erosion and conservation

The effect of rainfall over the soil which is covered by vegetation and the effect over the soil left bare after harvesting, respectively, would be

  1. No change in both cases

  2. No soil erosion and rapid soil erosion

  3. Rapid soil erosion and no soil erosion

  4. Soil erosion in both cases
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Roots of plants hold the soil particles and prevent their loss. Hence vegetation prevents soil erosion. When vegetation is lost and soil is kept barren after harvesting there is soil erosion due to the loss of upper soil layer caused by heavy wind or flowing water. Thus the correct answer is option B.  

Multiple choice biology the soil soil erosion (geo) soil erosion, soil conservation and uses of soil soil erosion and conservation

Main cause of soil erosion

  1. Afforestation

  2. Less rains

  3. Thinning of ozone layer

  4. Deforestation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In deforestation, there is the cutting or the removal of plants. The roots of the plants allow the soil to be held due to the presence of water. Due to deforestation, the water present in the soil gets evaporated resulting in a barren land. This barren land is prone to soil erosion which results in the loss of the upper layer of the soil. When new trees are planted, the soil erosion can be prevented. 

Thus, the correct answer is option D. 

Multiple choice biology the soil soil erosion (geo) soil erosion, soil conservation and uses of soil soil erosion and conservation

What happen when rain falls on soil without vegetational cover?

  1. Rain water percolates into soil efficiently.

  2. Rain water cause loss of surface soil.

  3. Rain water leads to fertility of the soil.

  4. Does not cause any changes in the soil
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

During heavy rainfall, trees act as a natural absorber. They prevent soil erosion, thereby reducing sediments going into rivers and increasing water absorption into the ground. But when the soil is without vegetational cover rainwater carries away the soil and causes its loss. Thus the correct answer is option B.

Multiple choice biology the soil soil erosion (geo) soil erosion, soil conservation and uses of soil soil erosion and conservation

To prevent soil erosion, farmer plants a hedge across a field. This method works because

  1. The hedge prevents the soil from direct impact of rainwater

  2. The roots of plants prevent the soil erosion

  3. The hedge absorbs minerals from the soil, which makes it most compact

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The roots of the plants allow the soil to be held due to the presence of water. Soil erosion is the loss of the fertile soil due to an absence of plants which can hold the soil. The farmers plant hedges across a field which prevents the carrying away of the soil during rain. 

Thus, the correct answer is option B. 

Multiple choice biology the soil soil erosion (geo) soil erosion, soil conservation and uses of soil soil erosion and conservation

Removal of topsoil by wind and water is called as

  1. Soil conservation

  2. Soil binding

  3. Soil erosion

  4. Mulching
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Soil is formed as a result of weathering of rocks. There are also many living organisms in the soil. Soil is, in fact a product of the interaction of living organisms with rocks. Soil has many layers. The topmost layer is called the topsoil and is the most fertile. The removal of this topsoil is called soil erosion. Water and wind cause the topsoil to be removed. Soil erosion is mainly associated with deforestation and agriculture. The main cause of soil erosion is the removal of vegetation. 

Multiple choice biology the soil soil erosion (geo) soil erosion, soil conservation and uses of soil soil erosion and conservation

The removal of topsoil by water and wind is called as

  1. Soil tilling

  2. Soil erosion

  3. Soil mulching

  4. Weathering
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The surface layer of land is called as soil. Topsoil is the uppermost layer of the Earth's surface layers. Top soil is soft and light and can be carried away easily. Water and wind cause the topsoil to be removed. This process of carrying of top soil by wind and water is called as soil erosion. 

Multiple choice biology the soil soil erosion (geo) soil erosion, soil conservation and uses of soil soil erosion and conservation

Which of the following should be increased to prevent soil erosion?

  1. Flow of water

  2. Green areas

  3. Deforestation

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Trees keep the soil particles bound together. They have roots that extend deep in the soil. The roots of trees hold the soil particles tightly together and prevent their erosion and washing away due to factors like wind, water, rains etc.

So, option B is the correct answer.