Discussion
Assertion (A) : Biosphere constitutes an excellent life-support system which is sustainable and can fulfil all human needs.
Reason (R) : The size and productivity of the biosphere is limited by availability of water, nutrients and environmental conditions.
Identify the correct code :
Answer: D
The correct code is (A) is false, but (R) is true.
The Reason is a sound ecological statement: the biosphere's size and productivity are limited by the availability of water, nutrients and suitable conditions such as temperature and light.
Those very limits make the Assertion false. A life-support system with finite productivity cannot fulfil all human needs sustainably, however large they grow; overuse of soil, water, forests and fisheries shows that human demand can exceed what the biosphere regenerates. Since the Assertion is false, the options that call it true are all wrong.
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