Question

With respect to the given assertion and reason, choose the correct option

Assertion [A]: Net primary productivity is greater than gross primary productivity.
Reason [R]: A part of net primary productivity goes waste during respiration.

• A. Both A and R are true R explains A
• B. Both A and R true but R does not explain A
• C. A is true but R is false
• D. Both A and R are false

Answer 1

The correct option is D Both A and R are false

Gross primary productivity (GPP) is the rate at which energy is captured or organic matter is synthesised by the producers per unit area and time. Net primary productivity (NPP) is a measure of the GPP remaining after meeting the cost of respiration and maintenance for the producers. This relationship between NPP and GPP can be simplified by the following equation: NPP = GPP – R (R = respiration and other losses).