CBSE Science Class 7
Soil
Soil - Chapter Wise CBSE Solved Question and Answer Based On NCERT
Very Short Q&A:
Q1: Name an important natural resource that supports growth of plants.
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Q2: Name major soil pollutants.
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Ans:
Polythene bags, plastics, waste products, chemicals and pesticides.
Q3: Waste products and chemicals should be treated before they are released into the soil. True/False.
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Ans:
The rotting dead matter in soil is called humus
Q4: Define humus.
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Q5: What do you mean by soil profile?
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Ans:
A vertical section through different layers of the soil is called the soil profile.
Q6: What is soil?
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Ans:
Soil is the crust part of the earth. It is mainly the mixture of rock particles and humus.
Q7: Name the process by which soil is formed.
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Q8: Each layer of soil differs in feel (texture), colour, depth and _______________.
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Ans:
Chemical composition.
Q9: Loamy soil It is a mixture of
- sand
- soil
- silt
- All of the above
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Q10: Loamy soil also contains humus, and is, therefore, considered the best for the growth of plants. True/ False
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Q11: Name the soil with highest water absorption rate.
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Q12: Name the soil having very less space between particles.
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Q13: Clay soils are heavy and hold more _______________.
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Q14: Ram hast to grow wheat crop in his field, what kind of soil he will prefer?
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Q15: Deforestation causes
- Rainfall
- Water pollution
- Soil erosion
- None of these.
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Q16: Name some places with severe soil erosion.
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Ans:
Areas of little or no surface vegetation, such as deserts and barren lands.
Q17: Classify soil on the basis of appearance and properties of particles.
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Ans:
Sandy soil, Clay soil and Loamy soil
Q18: State on property of sandy soil.
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Ans:
Sandy soils are light, well aerated and dry.
Q19: State on property of loamy soil.
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Ans:
It is a mixture of sand, soil and silt. And also contain humus.
Q20: State on property of clayey soil.
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Ans:
It is made of a relatively high proportion of fine particles.
Q21: What is deforestation?
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Ans:
Clearing or Removal of forests or stands of trees.
Q22: In addition to rock particles, the soil contains
- Air and water
- Minerals
- Minerals, organic matter air and water
- Organic matter
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Ans:
Minerals, organic matter air and water
Q23: The water holding capacity is highest in
- clayey soil
- Loamy soil
- Sandy soil
- None of these
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Q24: Name the soil horizon which contains humus.
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Q25: Upper layer of soil is ___________ in colour.
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Q26: Middle layer of soil contains less amount of _________________.
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Q27: Why is uppermost layer of soil, dark in colour?
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Ans:
Because it is rich in humus and minerals.
Q28: Suggest an alternative of chemical fertilizer.
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Q29: Acid rain causes soil pollution or not?
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Q30: We can prevent soil erosion by:
- Using step farming in hill regions
- Afforestation
- Avoiding overgrazing of grass lands
- All of these
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Q31: Plastics and poly bags should get mixed in soil. True/False
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Q32: Humus is important for soil fertility. True/False
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Q33: If the amount of large and fine particles is about the same, then soil is called _____________.
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Q34: What is bedrock?
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Ans:
After the C- horizon, there lies bedrock which is hard and difficult to dig with a spade.
Q35: Name the layer of soil having lesser amount of humus but more of minerals.
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Q36: What kind of soil is used for making matkas and toys?
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Q37: Give the formulae for percolation rate.
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Ans:
Percolation rate= amount of water (mL)/ Percolation time (min)
