Q3 / 180 · AIIMS 2018 (27 May) · Botany

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

  • A
    If both assertion and reason are true and reason is the correct explanation of assertion.
  • Correct answer
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
  • C
    If assertion is true but reason is false.
  • D
    If both assertion and reason are false.

Solution

Net primary productivity is the rate of organic matter built up or stored by producers in their bodies in a unit area/volume per unit time. Net productivity is equal to gross primary productivity minus loss due to respiration and other reasons. Rate of increase in energy containing organic matter or biomass by heterotrophs or consumers per unit time and area is known as secondary productivity.

Hence, the correct answer is option: 'B'.

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