Sample Questions — Productivity
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MCQ
Q10. What distinguishes primary productivity from secondary productivity?
✅ Correct Answer: A
Primary productivity relates to autotrophs, secondary to heterotrophs.
MCQ
Net primary productivity (NPP) is calculated by subtracting:
✅ Correct Answer: B
NPP = GPP – R (where R = respiration losses).
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MCQ
The biomass available for consumption by herbivores and decomposers is called:
✅ Correct Answer: A
Only net productivity is available to heterotrophs.
MCQ
Which of the following statements are TRUE regarding productivity?
1. Productivity is measured in gm⁻² or kcal m⁻²
2. NPP includes losses due to herbivory and decomposition
3. Oceans contribute the majority of Earth's NPP
4. Secondary productivity depends on consumer metabolism
✅ Correct Answer: A
Statement 2 is false: NPP excludes losses by herbivory/decomposition. Statement 3 is false: Oceans have lower productivity. Statement 1 and 4 are correct.
MCQ
Match-the-Column:
Column I
A. Primary Productivity
B. Net Primary Productivity
C. GPP – R
D. Secondary Productivity
Column II
1. Productivity by herbivores and carnivores
2. Productivity of autotrophs before respiration loss
3. Available biomass to heterotrophs
4. kcal m⁻² yr⁻¹
✅ Correct Answer: B
Primary Productivity → measured in gm⁻² or kcal m⁻² yr⁻¹; NPP → biomass available to heterotrophs; GPP – R is how NPP is calculated; Secondary Productivity = consumer biomass gain
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