Air is always around us, though we have never seen it but always felt its presence. Air can be felt when the leaves of the trees rustle and the clothes hanging on the cloth wires swag. The pages of a book start fluttering when the fan in the room is switched on. The wind makes the kite fly.
During storm the wind blows with high speed which can also uproot trees and blow off rooftops. In earlier times, air was thought to be one single substance but now it is known that air is a mixture of many gases. Oxygen and nitrogen are the significant components of air that play an important role in the survival of life on earth.
Importance of Air
We all need oxygen for respiration. The terrestrial lives directly take oxygen from the atmosphere for breathing. What about the organisms living in water or soil? Even they need oxygen in order to remain alive. Air in small concentrations is dissolved in water and aquatic organisms take this oxygen. Bubbles are observed in water due to the dissolved air in it.
If we take a lump of dry soil and add water to it, bubbles will be observed which indicates the presence of air molecules. Water displaces the air present in the soil and hence bubbles are formed. The organisms living in the soil respire through oxygen present in this air. Animals living in soil form holes and burrows. These burrows make space for air molecules to move in. When it rains, water fills up the vacant spaces and this is the reason why we see organisms like earthworms coming up the soil for air during rainy season.
We use oxygen all the time but it is still not exhausted because trees return this oxygen to the atmosphere during the process of photosynthesis. Plants also consume oxygen but their consumption is very less as compared to their production. Hence the net effect is that they add oxygen to the atmosphere. Animals are dependent on plants for oxygen and plants are dependent on animals for carbon dioxide (plants use carbon dioxide as a raw material for producing food). Hence plants and animals are interdependent and they maintain a balance between carbon dioxide and oxygen in the atmosphere.
The article briefly describes the importance of air for survival. For any further detail install, Byju’s the learning app.
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