Question

A. VERY SHORT ANSWER TYPE QUESTIONS
1. What are the three layers of soil ?
2. Which soil is best for growing crops ?
3. Why clayey soil is considered good for growing paddy?
4. What is humus?
5. Name some organisms living in the soil.​

Answer 1

Explanation:

1.the three layers of soil areMost soils have three major horizons (A, B, C) and some have an organic horizon (O). The horizons are: O -(humus or organic) Mostly organic matter such as decomposing leaves. The O horizon is thin in some soils, thick in others, and not present at all in others.

2.loam soil is best

3.it grows well in clayey soil as it has a lower percolating rate. That means it's water holding capacity is very high.

4.the organic component of soil, formed by the decomposition of leaves and other plant material by soil microorganisms

5.bacteria, actinomycetes, fungi, algae, protozoa, and a wide variety of larger soil fauna, including springtails, mites, nematodes, earthworms, ants, insects.

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Answer 2

Answer:

• 1.The simplest soils have three horizons: topsoil (A horizon), subsoil (B horizon), and C horizon.

• 2.Loam soils are best for plant growth because sand, silt, and clay together provide desirable characteristics.

• 3 .Water does not drain quickly through clayey soil because of less space among particles. So, clayey soil is not well aerated and retains more water. ... Clayey soil is good for growing paddy. Loamy Soil: Particles of loamy soil are smaller than sand and larger than clay.

• 4.Humus is dark, organic material that forms in soil when plant and animal matter decays. When plants drop leaves, twigs, and other material to the ground, it piles up.

• 5.Living organisms present in soil include archaea, bacteria, actinomycetes, fungi, algae, protozoa.

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