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NEET 2024
Exam
NEET
Year
2024
Subject
Botany
Chapter
Ecosystem

NEET 2024 · Botany · Ecosystem

In an ecosystem if the Net Primary Productivity (NPP) of first...

In an ecosystem if the Net Primary Productivity (NPP) of first trophic level is 100x(kcalm−2)yr−1100 x\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?

Options

  1. Ax(kcalm−2)yr−1x\left(\mathrm{kcal} \mathrm{m}^{-2}\right) \mathrm{yr}^{-1}
  2. B10x(kcalm−2)yr−110 x\left(\mathrm{kcal} \mathrm{m}^{-2}\right) \mathrm{yr}^{-1}
  3. C100x3x(kcalm−2)yr−1\frac{100 x}{3 x}\left(\mathrm{kcal} \mathrm{m}^{-2}\right) \mathrm{yr}^{-1}
  4. Dx10(kcalm−2)yr−1\frac{x}{10}\left(\mathrm{kcal} \mathrm{m}^{-2}\right) \mathrm{yr}^{-1}

Correct answer

B. 10x(kcalm−2)yr−110 x\left(\mathrm{kcal} \mathrm{m}^{-2}\right) \mathrm{yr}^{-1}

Step-by-step solution

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, 100x(kcal/m2/yr100 x\left(\mathrm{kcal} / \mathrm{m}^2 / \mathrm{yr}\right. ) would be GPP at second trophic level and 100x×10%(kcal/m2/yr)100 x \times 10 \%\left(\mathrm{kcal} / \mathrm{m}^2 / \mathrm{yr}\right) i.e., 10 x\left(\mathrm{kcal} / \mathrm{m}^2 / \mathrm{yr}\right) energy would be GPP at third trophic level.
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