Question

Rate of storage of organic matter not used by heterotrophs is termed as

• A. Net productivity
• B. Net primary productivity
• C. Gross primary productivity
• D. Secondary productivity

Answer 1

The correct option is B Net primary productivity

Productivity is also called as the rate of production. It is defined as the amount of organic matter accumulated in a given time. Gross primary productivity is defined as the total rate of photosynthesis including the organic matter used up in respiration in a given time. Net primary productivity is defined as the rate of storage of organic matter not used by heterotrophs. Secondary productivity is defined as the amount of organic matter stored at consumer level.

Thus, the correct answer is 'Net primary productivity.'