BIOLOGY [2 Mark Question Answer]

It is an important abiotic factor, it indicates the amount of water vapor in the air. It directly regulates the rate at which water evaporates from the body surface of the land organisms by transpiration, perspiration and other means. Different plants and animals show various adaptation to withstand dry condition.

Humus is a substance formed by dead leaves and plants, that we put into the ground to help plants grow. Humus is partially decayed organic matter. The uppermost layer of the soil is rich in humus.

The space around us is filled with air and dust particles. This envelop of air surrounding the earth's unit surface area is called the atmosphere. It acts as a protective blanket for the Earth. It absorbs most of the harmful radiations such as UV rays of the sun.