MCQ Soil Chapter 9 Class 7 Science

1. Which one of the following is a step in the formation of soil?

Earthquakes or volcanic eruptions

Weathering of rocks

Addition of humus

All are involved in the formation of soil

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Question 1 of 10

2. In which horizon of soil minerals are found?

None of these

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Question 2 of 10

3. Which physical property of soil is important to us?

Texture

Water holding capacity

Both of these

None of these

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Question 3 of 10

4. Which of the following type of soil will form a colloidal solution when suspended in water?

Clay

Silt

Sand

Gravel

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Question 4 of 10

5. Which factor influences soil formation?

Climate

Vegetation

Parent rock

All of these

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Question 5 of 10

6. The proportion of sand, silt and clay in a soil sample determines

structure

texture

nutrient potential

fertility level

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Question 6 of 10

7. The microorganisms present in the soil require moisture (water) and nutrients for growth and survival. Choose from the options below the habitat (place) where the soil has plenty of water and nutrients.

Desert

Forest

Open field

Cricket ground

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Question 7 of 10

8. Availability of water and minerals in the soil for maximum absorption by roots is in the:

B-horizon

C-horizon

A-horizon

Surface of soil

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Question 8 of 10

9. Soil conservation measures are mainly aimed at protecting which of the following?

Plants

Sub soil

Top soil

Soil organisms

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Question 9 of 10

10. Read the following statements with reference to soil:
(i) Weathering is a very fast process of soil formation.
(ii) Percolation of water is faster in sandy soils.
(iii) Loamy soil contains only sand and clay.
(iv) Top soil contains the maximum amount of humus.
Choose the correct statements from the above.

(ii) and (iv)

(i) and (iii)

(ii) and (iii)

(i) and (ii)

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Question 10 of 10

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