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NEET · Biology · STD 12 - 12. ecosystem

જો એક નિવસનતંત્રમાં પ્રથમ પોષક સ્તરની વાસ્તવિક પ્રાથમિક ઉત્પાદકતા (\(NPP\)) \(100 x\left(\mathrm{kcal} \mathrm{m}^{-2}\right) \mathrm{yr}^{-1}\) છે, તો તે જ નિવસનતંત્રમાં તૃતીય પોષક સ્તરની કુલ પ્રાથમિક ઉત્પાદકતા (GPP) કેટલી હશે?

  1. A \(x\left(\mathrm{kcal} \mathrm{m}^{-2}\right) \mathrm{yr}^{-1}\)
  2. B \(10 x\left(\mathrm{kcal} \mathrm{m}^{-2}\right) \mathrm{yr}^{-1}\)
  3. C \(\frac{100 x}{3 x}\left(\mathrm{kcal} \mathrm{m}^{-2}\right) \mathrm{yr}^{-1}\)
  4. D \(\frac{x}{10}\left(\mathrm{kcal} \mathrm{m}^{-2}\right) \mathrm{yr}^{-1}\)
Verified Solution

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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