Question

Q Complete

a) The decaying organic matter present in soil called _________

b) Black soil is good for cultivation of _________​

Answer 1

a) The dark black upper layer of soil is known as humus. It is actually the dead matter 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 soil. The soil organisms use the organic matter its food and in the process convert in into nutrient rich humus for plant growth. 

b) Black soil is ideal for growing cotton and is also known as black cotton soil. These soils are made up of extremely fine i.e. clayey material. They are well-known for their capacity to hold moisture.  

Answer 2

Answer:

A. The decaying organic matter present in soil called microworms, earthworms

B. Black soil is good for cultivation of cotton crop.

Hope it's helpful to you.