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Question

Regarding assertion and reason, choose the correct statement:
Assertion [A]: Marine ecosystems have lesser trophic levels than terrestrial ecosystems.
Reason [R]: Most of the phytoplankton is available for consumption and assimilation by primary consumers in aquatic ecosystems.
  1. A is true and R is false
  2. Both A and R are true and R explains A
  3. Both A and R are true R does not explain A
  4. A is false and R is true


Solution

The correct option is D A is false and R is true
In marine ecosystems, phytoplankton carry out most of the photosynthesis that occurs. Phytoplankton are small organisms like diatoms with extremely simple structures, so most of their primary production or biomass is consumed by grazing organisms that feed on them. In contrast, a large fraction of the biomass that land plants produce, such as roots, trunks, are complex and cannot be consumed by herbivores for food, so proportionately less of the energy is fixed through primary production in terrestrial ecosystems. This is the reason why terrestrial ecosystems have smaller food chains or lesser trophic levels than marine ecosystems.

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