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NEET2024BotanyEcosystemActual

In an ecosystem if the Net Primary Productivity (NPP) of first trophic level is 100 x ( kcal m ⁻² ) yr ⁻¹ , what would be the GPP (Gross Primary Productivity) of the third trophic level of the same ecosystem?

Options

  1. Ax ( kcal m ⁻² ) yr ⁻¹
  2. B10 x ( kcal m ⁻² ) yr ⁻¹
  3. C100 x 3 x ( kcal m ⁻² ) yr ⁻¹
  4. Dx 10 ( kcal m ⁻² ) yr ⁻¹

Correct answer

B. 10 x ( kcal m ⁻² ) 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, 100 x ( kcal / m ^2 / yr . ) would be GPP at second trophic level and 100 x 10 % ( kcal / m ^2 / yr ) i.e., 10 x ( kcal / m ^2 / yr ) energy would be GPP at third trophic level.

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