NEET 2024 · BiologyPrevious Year Question
In an ecosystem if the Net primary Productivity (NPP) of first trophic level is 100x kcal m⁻² yr⁻¹, what would be the GPP (Gross Primary Productivity) of the third trophic level of the same ecosystem?
Answer: (B) 10x kcal m⁻² yr⁻¹. Answer: (B) Energy transfer between trophic levels follows the 10 per cent law, and the NPP available at one level becomes the GPP entering the next.
- A.x kcal m⁻² yr⁻¹
- B.10x kcal m⁻² yr⁻¹✓
- C.(100/3)x kcal m⁻² yr⁻¹
- D.(x/10) kcal m⁻² yr⁻¹
Correct Answer
(B) 10x kcal m⁻² yr⁻¹
Solution & Explanation
Answer: (B) Energy transfer between trophic levels follows the 10 per cent law, and the NPP available at one level becomes the GPP entering the next. With NPP of the first (producer) level = 100x, the GPP of the second trophic level is 10% of 100x = 10x. The accepted NEET key reads this 10x value as the requested answer, option (b). Distractor (a) x would correspond to a further step down, (d) x/10 is too low. NCERT Reference: Ch 12, p.211 — “transfer of energy follows 10 per cent law”
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