Question

The natural purifiers of the air___________.

Answer 1

Hint: Clean air is a key for good health. The major air pollutant is the carbon dioxide which is the by-product of respiration. It causes a greenhouse effect which needs to be purified naturally. Other pollutants include automobile exhaust, industrial gases etc.

Complete answer:
The addition of harmful substances to the air is called air pollution. Carbon dioxide is one such pollutant which causes maximum pollution in the environment. As a result of which greenhouse effect is created which causes global warming. Global warming leads to an increase in temperature which affects all the flora and fauna.

The photosynthesis is the process which utilises the carbon dioxide. The green plants and photosynthetic algae carry out this process. The photosynthesis is the process by which green plants and algae utilise carbon dioxide and prepare their own food in the form of carbohydrate and release oxygen which is essential for all the living organisms.

Thus, the plants and photosynthetic algae act as natural air purifiers which absorb carbon dioxide from the environment and in turn release oxygen.

The advantages of plants as air purifiers are that they are natural and cost effective. Apart from absorbing carbon dioxide, plants and algae are efficient in absorbing formaldehyde and benzene.

Note: The plants carry out photosynthesis during the day time. During the night it also releases carbon dioxide as a by-product of respiration. Some plants like aloe vera, snake plants can evolve oxygen during the night as well. The plants and photosynthetic algae are cost effective, natural and therapeutic.