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  4. Assertion Gross primary productivity is always more than net primary productivity. Reason Consumers exhibit secondary productivity in a ecosystem.

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Q. Assertion Gross primary productivity is always more than net primary productivity.
Reason Consumers exhibit secondary productivity in a ecosystem.

AIIMSAIIMS 2017

Solution:

Net primary productivity is equal to gross primary productivity minus loss due to respiration and other reasons. Secondary productivity is defined as the rate of formation of new organic matter by consumers.