Multiple choice questions XXXXV — task. Science CBSE, Class 10.

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1. In other to maintain proper ecological balance

a tree should be planted in place of one to be cut
some quick growing annuals should be planted if a tree must be cut for other uses
tree must be curt whenever necessary because the underground part performs the useful purpose
the existing forests should be cleared and new ones should be planted

2. A biosphere is composed of

living organisms, lithosphere and atmosphere
living organisms and lithosphere
living organisms
living organisms, lithosphere, atmosphere and hydrosphere

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