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NEETBotanyEcosystem

Read the following statement and identify the correct terms for X and Y. The rate of formation of new organic matter by a herbivore (such as a rabbit) is called ___(X)___, and this process strictly depends on the ___(Y)___ of the producers.

Options

  1. AX = Secondary productivity, Y = Gross primary productivity
  2. BX = Secondary productivity, Y = Net primary productivity
  3. CX = Net primary productivity, Y = Gross primary productivity
  4. DX = Gross primary productivity, Y = Net primary productivity

Correct answer

B. X = Secondary productivity, Y = Net primary productivity

Step-by-step solution

According to NCERT, the rate of formation of new organic matter by consumers (heterotrophs) is defined as secondary productivity (X). Consumers depend on the biomass made available by producers. Since plants utilize a portion of their gross primary productivity (GPP) for respiration, only the remaining biomass, known as net primary productivity (NPP), is available for consumption by herbivores and decomposers (Y). Therefore, X is secondary productivity and Y is net primary productivity. Answer: X = Secondary produc

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