Class 7 Science MCQ Questions of Soil with Answer are available here. Every one of the various decision questions is offered here with reasonable answers and clarification of answers. The content is updated for academic session 2021-2022. Significant MCQ Questions for Class 7 Science, collectively give a perfect revision of the part for Class 7 understudies. Practice here with MCQ Questions to score great marks in tests and clear your questions. 

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Practice MCQ Questions for Class 7 Science

1. 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

2. In which horizon of soil minerals are found?

(a) A
(b) B
(c) C
(d) None of these

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

(a) Clay
(b) Silt
(c) Sand
(d) Gravel

4. Which factor influences soil formation?

(a) Climate
(b) Vegetation
(c) Parent rock
(d) All of these

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

(a) structure
(b) texture
(c) nutrient potential
(d) fertility level

6. 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

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

(a) Plants
(b) Topsoil
(c) Sub soil
(d) Soil organisms

8.  Soil is the substance which makes up the _________ of the earth.

(a) rock
(b) layers
(c) surface
(d) all of the above

9. Which of the following does not cause soil erosion?

(a) Deforestation
(b) Solid wastes 
(c) Floods
(d) Overgrazing

10. The best top soil for growing plants is

(a) sandy soil
(b) loamy soil
(c) clayey soil
(d) all of these

11. The mixture of rock particles and humus is called

(a) soil
(b) weathering
(c) silt
(d) gravel

12. One of the following is not a type of soil. This one is

(a) loamy soil
(b) silty soil
(c) clayey soil
(d) sandy soil

13.  Which of the following has smallest size soil particles?

(a) Gravel
(b) Silt
(c) Clay
(d) Sand

14. Cotton grows well in

(a) black soil
(b) laterite soil
(c) red soil
(d) loamy soil

15.  Which of the following cannot prevent soil erosion?

(a) Reforestation
(b) Deforestation
(c) Silviculture
(d) Plantation

16. Sandy soils are found in

(a) hilly areas
(b) tropical region
(c) deserts
(d) polar region

17. _________ are soils in which more than half of the parent mineral matter is volcanic ash and appear very dark in colour.

(a) Desert soil
(b) Volcanic soil
(c) Alluvial soil
(d) Clayey soil   

18. A well-developed soil profile is the result of:

(a) physical process
(b) chemical process
(c) organic process
(d) All of the above

19. Soil contains rock particle and_______.

(a) water and air
(b) water and plants
(c) minerals, organic matter, air and water
(d) water, air and plants

20. Soil best suited for cultivation of wheat, rice and sugarcane is

(a) Alluvial soil
(b) Laterite soil
(c) Mountain soil
(d) None of these.

21. Humus refers to the:

(a) top most layer
(b) bottom layer
(c) rotting dead matter in soil
(d) None of these

22. Clay particles are of size

(a) More than 0.004 mm
(b) Less than 0.04 mm
(c) More than 0.02 mm
(d) Less than 0.002 mm

23. Assertion: The hills with dense vegetation cover do not experience heavy soil erosion.

Reason: The vegetation cover helps infiltration of rainwater and binding of soils.

(a) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion            
(b) Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
(c) Assertion is correct but Reason is incorrect       
(d) Assertion is incorrect but Reason is correct

24. In India laterite soil is found in 

(a) Bihar
(b) Haryana
(c) Kerala
(d) Uttar Pradesh

25.  __________ should be banned to prevent soil pollution.

(a) Fertilisers
(b) Metals
(c) Plastics
(d) Glass

Answer:

1. Answer: (b) Weathering of rocks

Explanation: Weathering of rocks is a step in the formation of soil because the basis of the formation of soil is soil minerals which are produced from the rocks.

2. Answer: (a) A

Explanation: Topsoil that is the A horizon is the layer of soil that is located just below the O Horizon. This layer consists of minerals and decomposed organic matter.

3. Answer: (a) Clay

Explanation: Clay soil will form a colloidal solution when suspended in water.

4. Answer: (d) All of these

Explanation: Formation of soil is called pedogenesis. Soil formation is the process of soil formation from its parental material. In addition to the soil parent material, soil formation is also dependent upon other prevailing processes like climate, relief, etc.

5. Answer: (b) texture

Explanation: Texture refers to the size of the particles that make up the soil. The terms sand, silt, and clay refer to relative sizes of the soil particles. The combined portions of sand, silt, and clay in a soil determine its textural classification.

6. Answer: (b) Forest

Explanation: In the forest, plenty of plants and trees are grown. Because of plants and trees, in the forest moisture and nutrients are sufficient. It helps to promote the expansion of micro-organisms. 

7. Answer: (b) Topsoil

Explanation: The soil conservation measures are mainly aimed at protecting the topsoil. It is the nutrient-rich soil with humus and is fertile in nature that helps the plants to grow.

8. Answer: (c) surface

Explanation: Soil is a mixture of organic matter, minerals, gases, liquids, and organisms that together support life. Earth's body of soil, called the pedosphere, has four important functions: as a medium for plant growth. as a means of water storage, supply and purification.

9. Answer: (b) Solid wastes 

Explanation: Soil erosion occurs when the weathered soil particles are dislodged and carried away by wind or water. Deforestation, agricultural development, temperature extremes, precipitation including acid rain, and human activities contribute to this erosion. Humans speed up this process by construction, mining, cutting of timber, over cropping and overgrazing. It results in floods and cause soil erosion.

10. Answer: (b) loamy soil

Explanation: The best topsoil for growing plants is loam. Loam is a mixture of sand, silt, clay and humus. It has the right water-holding capacity for plant growth.

11. Answer: (a) soil

Explanation: The mixture of rock particles and humus is called the Soil.

12. Answer: (b) silty soil 

Explanation: Silty is not a type of soil. Sand, clay, silt, and humus in the proper amounts make up loamy soil.

13. Answer: (c) Clay

Explanation: Clay has the smallest size of particles, less than 0.002 mm in diameter.

14. Answer: (a) black soil

Explanation: Black Soil covers the Deccan plateau along the Godavari and Krishna valleys. This soil is rich in calcium carbonate, potash, magnesium, and lime making it ideal for growing cotton.

15.  Answer: (b) Deforestation

Explanation: Deforestation causes soil erosion. Deforestation causes soil erosion.

16. Answer: (c) deserts

Explanation: In the desert, there are few plants to hold soil in place and little water. Instead, wind is the main way that the rock pieces are moved around. The wind cannot move all the pieces though, just the small lighter ones, so sand is left behind. Over a long time the deserts become mostly sand.

17. Answer: (b) Volcanic soil

Explanation: They are often very rich in nutrients and hold water well because of their volcanic ash content. These soils are called Andisols, and they are often very young, and acidic depending on which type of volcano they come from.

18. Answer: (d) All of the above

Explanation: The soil is a mixture of fine rock particles and organic matter. Chemical processes involve the weathering of rocks by chemical reactions. Organic or biological processes involve the weathering of rocks by biological agents such as lichens and mosses.

19. Answer: (c) minerals, organic matter, air and water

Explanation: Soil composition refers to the nutrients and various other substances present in the soil. The basic components of soil are minerals, organic matter, water, and air. The typical soil consists of approximately 45% mineral, 5% organic matter, 20-30% water, and 20-30% air.Hence In addition to the rock particles, the soil contains Minerals, organic matter, air, and water.

20. Answer: (a) Alluvial soil

Explanation: Alluvial soils are ideal for the growth of sugarcane, paddy, wheat and other cereal and pulse crops.

21. Answer: (c) rotting dead matter in soil

Explanation: The dark black upper layer of the soil is known as humus. It is the dead remains of plants and animals that have been decomposed by bacteria and fungi. This humus-rich soil increases the aeration capacity of soil and also helps in the penetration of roots of plants. The decomposition of organic matter helps in bringing the plant and animal residues back to the soil.

22. Answer: (d) Less than 0.002 mm

Explanation: Starting with the finest, clay particles are smaller than 0.002 mm in diameter. Some clay particles are so small that ordinary microscopes do not show them. Silt particles are from 0.002 to 0.05 mm in diameter.

23. Answer: (a) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion        

Explanation: The roots of the plants bind the soil together, and interweave with other roots, forming a more solid mass that is less susceptible to both water and wind erosion. The removal of vegetation increases the rate of surface erosion.

24. Answer: (c) Kerala

Explanation: Laterite has been derived from the Latin word ‘later’ which means brick.  The laterite soil develops in areas with high temperature and heavy rainfall.  These soils are mainly found in Karnataka, Kerala, Tamil Nadu, Madhya Pradesh, and the hilly areas of Orissa and Assam. This soil is very useful for growing tea and coffee. 

25. Answer: (c) Plastics

Explanation: necessary throw waste also contain food with plastic, when cattles hunt for their food they eat food along with plastic which can led to their death. plastic also cause soil pollution as plastic is not burn completely and it leaves residue.

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