CBSE Class 7 Science - MCQ and Online Tests - Unit 9 - Soil

CBSE Class 7 Science – MCQ and Online Tests – Unit 9 – Soil

 

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CBSE Class 7 Science – MCQ and Online Tests – Unit 9 – Soil

Choose the correct answer:

Question 1.
The proportion of sand, silt and clay in a soil sample determines
(a) structure
(b) texture
(c) nutrient potential
(d) fertility level

Answer

Answer: (b) texture

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Question 2.
Soil conservation measures are mainly aimed at protecting which of the following?
(a) Plants
(b) Topsoil
(c) Sub soil
(d) Soil organisms

Answer

Answer: (b) Topsoil
Soil conservation measures mainly aim at protecting topsoil, which is rich in humus and nutrients making it fertile to grow plants.

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Question 3.
Which physical property of soil is important to us?
(a) Texture
(b) Water holding capacity
(c) Both of these
(d) None of these

Answer

Answer: (c) Both of these

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Question 4.
Which of the following type of soil will form a colloidal solution when suspended in water?
(a) Clay
(b) Silt
(c) Sand
(d) Gravel

Answer

Answer: (a) Clay

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Question 5.
Which one of the following is a step in the formation of soil?
(a) Earthquakes or volcanic eruptions
(b) Weathering of rocks
(c) Addition of humus
(d) All are involved in the formation of soil

Answer

Answer: (d) All are involved in the formation of soil

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Question 6.
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.
(a) (ii) and (iv)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (i) and (ii)

Answer

Answer: (a) (ii) and (iv)

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Question 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.
(a) Desert
(b) Forest
(c) Open field
(d) Cricket ground

Answer

Answer: (b) Forest

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Question 8.
Availability of water and minerals in the soil for maximum absorption by roots is in the:
(a) B-horizon
(b) C-horizon
(c) A-horizon
(d) Surface of soil

Answer

Answer: (c) A-horizon

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Question 9.
Which factor influences soil formation?
(a) Climate
(b) Vegetation
(c) Parent rock
(d) All of these

Answer

Answer: (d) All of these

Question 10.
In which horizon of soil minerals are found?
(a) A
(b) B
(c) C
(d) None of these

Answer

Answer: (b) B

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