Primary productivity does not depend upon which one of the following factors?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → predators and decomposers
Option (1) Plant species inhabiting a particular area — Affects it.
Option (2) predators and decomposers — Does not affect it. Predators and decomposers are not named among the factors.
Option (3) availability of nutrients — Affects it.
Option (4) Photosynthetic capacity of plants — Affects it.
NCERT Extract:
Productivity – “… Primary productivity depends on the plant species inhabiting a particular area. It also depends on a variety of environmental factors, availability of nutrients and photosynthetic capacity of plants. Therefore, it varies in different types of ecosystems. The annual net primary productivity of the whole biosphere is approximately 170 billion tons (dry weight) of organic matter.”