Answer:
Forests
need to be replenished because of the following reasons:
(i) Rainfall: During transpiration, trees give out enormous amount of
water vapour. This water vapour helps in the formation of rain clouds. So, if trees
are cut and not replenished, the rainfall in the area will reduce.
(ii) Natural rate of tree growth: Forests cannot be
regrown in a few days or months as trees take many years to grow fully. Thus,
it becomes necessary to replenish the forests periodically.
(iii) Soil erosion: If a large number of trees are cut,
the soil becomes naked.
The top soil, which is rich in organic matter will be
washed away by water or carried away by wind. Trees help in binding the soil.
(iv) Carbon dioxide-oxygen balance: Forests have a very
large number of trees which give out O2 and take in CO2
in day time by photosynthesis. In this way, they help in maintaining the carbon
dioxide-oxygen balance in the atmosphere.
(v) Timber and fuel: Forests are the best suppliers of
timber for furniture and fuel. So, for their constant supply forests need to be
replenished.
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