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NEETBotanyEcosystem

In a grassland ecosystem, a grasshopper feeds on living grass leaves while a fungus decomposes fallen dead leaves. The total rate of biomass production that serves as the available food source for both of these organisms is mathematically represented as:

Options

  1. AGPP - R
  2. BGPP + R
  3. COnly GPP
  4. DSecondary productivity - R

Correct answer

A. GPP - R

Step-by-step solution

The grasshopper acts as a herbivore and the fungus acts as a decomposer. According to NCERT, Net Primary Productivity (NPP) is the available biomass for the consumption of heterotrophs, which includes both herbivores and decomposers. NPP is calculated as Gross Primary Productivity (GPP) minus the respiration losses (R) of the producers. Therefore, the mathematical representation of the available food source for these organisms is GPP - R. Answer: GPP - R

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