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NTA Abhyas NEET2020BotanyEcosystemPractice

Which of the following statements are true? 1 . Gross Primary Productivity is always greater than Net Primary Productivity. 2 . Gross Primary Productivity plus the respiration losses give us Net Primary Productivity. 3 . The rate of respiration of plants affects the Net Primary Productivity. 4 . Net Primary Productivity + Gross Primary Productivity = Respiratory loss.

Options

  1. A1 – T r u e ; 2 – F a l s e ; 3 – T r u e ; 4 – F a l s e
  2. B1 – T r u e ; 2 – T r u e ; 3 – F a l s e ; 4 – F a l s e
  3. C1 – F a l s e ; 2 – F a l s e ; 3 – T r u e ; 4 – F a l s e
  4. D1 – T r u e ; 2 – T r u e ; 3 – T r u e ; 4 – F a l s e

Correct answer

A. 1 – T r u e ; 2 – F a l s e ; 3 – T r u e ; 4 – F a l s e

Step-by-step solution

The rate at which the organic matter is produced by photosynthesis is called gross primary productivity. Plants make use of a substantial amount of GPP in respiration. The available biomass for consumption by heterotrophs is called as net primary productivity. So, respiratory losses minus the GPP will give the N P P. G P P – R = N P P . Therefore NPP can never be greater than GPP.

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