1
Question
Which of the following statements are true?
1. A-horizon is rich in humus.
2. Few plant roots can reach to B-horizon.
3. B-horizon is rich in both humus and minerals.
4. C-horizon is made up of small lumps of rocks with cracks and crevices.
5. Wind and water are the only agents responsible for weathering of rocks.
Which of the following statements are true?
1. A-horizon is rich in humus.
2. Few plant roots can reach to B-horizon.
3. B-horizon is rich in both humus and minerals.
4. C-horizon is made up of small lumps of rocks with cracks and crevices.
5. Wind and water are the only agents responsible for weathering of rocks.
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Solution
The correct option is D 1, 2, and 4 only
- A-horizon or topsoil contains more humus than the other layers of soil. Humus is the decayed remains of plants and animals, which breaks down in the soil by the microbes. Therefore, this happens more in the topsoil, than in any other soil layer. Thus, the top layer of soil has more humus than other layers. Hence, statement 1 is correct.
- The roots of tall plants can reach to B-horizon of the soil. This is because tall plants require more water, minerals and mechanical support. Therefore, statement 2 is correct.
- B-horizon is rich in minerals but the humus content is very less in B-horizon. Therefore, statement 3 is incorrect.
- C-horizon is made up of small lumps of rocks with cracks and crevices. Therefore, statement 4 is correct.
- Soil is formed by weathering of rocks. Weathering is the breakdown of rocks by the action of flowing water, wind, or extreme temperature. The factors responsible for weathering of rocks are wind, water, temperature and types of rocks. Therefore, statement 5 is incorrect.
- On comparing the options, the correct answer is option C.
- A-horizon or topsoil contains more humus than the other layers of soil. Humus is the decayed remains of plants and animals, which breaks down in the soil by the microbes. Therefore, this happens more in the topsoil, than in any other soil layer. Thus, the top layer of soil has more humus than other layers. Hence, statement 1 is correct.
- The roots of tall plants can reach to B-horizon of the soil. This is because tall plants require more water, minerals and mechanical support. Therefore, statement 2 is correct.
- B-horizon is rich in minerals but the humus content is very less in B-horizon. Therefore, statement 3 is incorrect.
- C-horizon is made up of small lumps of rocks with cracks and crevices. Therefore, statement 4 is correct.
- Soil is formed by weathering of rocks. Weathering is the breakdown of rocks by the action of flowing water, wind, or extreme temperature. The factors responsible for weathering of rocks are wind, water, temperature and types of rocks. Therefore, statement 5 is incorrect.
- On comparing the options, the correct answer is option C.
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