Question

An important protective function of forest is reduction of atmospheric pollution.
A. True
B. False
C. Neither
D. Either

Answer 1

Hint: The deforestation is one of the major reasons of increased air pollution. Trees purify the air in various ways most importantly, by giving out Oxygen as a by-product of photosynthesis.

Step by step answer:Trees during photosynthesis absorb carbon dioxide from the atmosphere and make food in the form of glucose. During this process, oxygen is produced as a by-product which is given out by trees. In a way, trees act for purifying air by eliminating carbon dioxide and mixing oxygen in it. Trees also hold onto soil via their roots and prevent soil pollution. Trees also perform transpiration, a process in which water is lost in the form of water vapour into the atmosphere and thus maintain the humidity and moisture content of the air. In highly polluted areas, the leaves of trees serve as a platform for allowing the harmful gaseous pollutant in the air to settle on them and thus reduces the amount of impure pollutants from the air.
Gaseous exchange co-ordinated by trees makes the water cycle more regular and smooth and in turn balances the other geological cycles in the environment. Trees and other vegetation also resist the airflow in their immediate vicinity, preventing pollution from being spread from one place to another by currents of cleaner air. If tall and thick trees are planted roadside, they can trap the pollutants emitted by vehicles. Thus, the forest definitely helps reduce pollutant levels and in turn, reduces pollution.
Hence, the correct answer is option A. true.
 Additional information: Trees only emit oxygen during daytime when sunlight is available which enables them to perform photosynthesis. At night, trees also perform respiration like all other living organisms and at that time they absorb oxygen and give out carbon dioxide.

Note: The forests help in reduction of pollution also balance various cycles including carbon cycle, oxygen cycle, etc. They also reduce the phenomenon of global warming by absorbing carbon dioxide and thus reducing the overall temperature of the earth’s atmosphere.