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Question

Assertion :Net primary productivity is gross primary productivity minus respiration. Reason: Secondary productivity is produced by heterotrophs.


A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
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C
Assertion is correct but Reason is incorrect.
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D
Assertion is incorrect but Reason is correct.
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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
Assertion is correct as net primary productivity is the rate of organic matter built up or stored by producers in their bodies per unit time and area. It is equal to the difference between the rate at which the plants in an ecosystem produce useful chemical energy (GPP) and the rate at which they use some of that energy during respiration which means is equal to gross primary productivity minus loss due to respiration and other reasons. 
Reason is correct as well but not correct explanation of assertion as rate of increase in energy containing organic matter or biomass by heterotrophs or consumers per unit time and area is known as secondary productivity. 
Therefore, the correct answer is option B.

Biology

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