NEET-UG Biology

Productivity: GPP, NPP and their numbers — practice questions

6 questions in the bank on this idea. Below are 6 of them, exactly as they appear in a test.

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Question 1 · difficulty L1 · recall
What does gross primary productivity measure?
- A. Only the energy stored after respiration
- B. Only the biomass consumed by herbivores
- C. Total producer organic-matter production
- D. The rate of decomposition
Question 2 · difficulty L2 · understanding
The rate of biomass production by consumers:
- A. secondary productivity
- B. mineralisation
- C. net primary productivity
- D. gross primary productivity
Question 3 · difficulty L2 · understanding
The relation between net and gross primary productivity:
- A. GPP = NPP - respiration
- B. NPP = GPP + respiration
- C. NPP = respiration only
- D. NPP = GPP - respiration
Question 4 · difficulty L2 · understanding
The total rate of photosynthetic production by producers:
- A. decomposition rate
- B. secondary productivity
- C. net primary productivity
- D. gross primary productivity
Question 5 · difficulty L2 · understanding
Two forests have the same GPP, but forest X has much higher producer respiration than forest Y. Which statement is correct?
- A. NPP is unrelated to respiration
- B. Forest X has higher NPP
- C. Both forests must have identical NPP
- D. Forest X has lower NPP
Question 6 · difficulty L3 · application
An ecosystem has a GPP of 2,000 units and producer respiration of 800 units over the same period. What is its NPP?
- A. 1,200 units
- B. 800 units
- C. 2,800 units
- D. 2,000 units

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