NEET · Biology · STD 12 - 12. ecosystem
In an ecosystem if the Net Primary Productivity (\(NPP\)) of first trophic level is \(100 \times\left(\mathrm{kcal} \mathrm{m}^{-2}\right) \mathrm{yr}^{-1}\), what would be the \(GPP\) (Gross Primary Productivity) of the third trophic level of the same ecosystem?
- A \(x\left(\mathrm{kcal} \mathrm{m}^{-2}\right) \mathrm{yr}^{-1}\)
- B \(10 x\left(\mathrm{kcal} \mathrm{m}^{-2}\right) \mathrm{yr}^{-1}\)
- C \(\frac{100 x}{3 x}\left(\mathrm{kcal} \mathrm{m}^{-2}\right) \mathrm{yr}^{-1}\)
- D \(\frac{x}{10}\left(\mathrm{kcal} \mathrm{m}^{-2}\right) \mathrm{yr}^{-1}\)
Answer & Solution
Correct Answer
(B) \(10 x\left(\mathrm{kcal} \mathrm{m}^{-2}\right) \mathrm{yr}^{-1}\)
Step-by-step Solution
Detailed explanation
\(NPP\) at first trophic level would be the \(GPP\) for second trophic level. \(NPP\) at second trophic level would be \(GPP\) for third trophic level. Therefore, \(100 x\left(\mathrm{kcal} / \mathrm{m}^2 / \mathrm{yr}\right)\) would be \(GPP\) at second trophic level and \(100 x\) \(\times 10 \%\left(\mathrm{kcal} / \mathrm{m}^2 / \mathrm{yr}\right)\) i.e., \(10 \times\left(\mathrm{kcal} / \mathrm{m}^2 / \mathrm{yr}\right)\) energy would be \(GPP\) at third trophic level.
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