Assertion: Greater number of individuals are present in lower trophic levels.

Reason: The flow of energy is unidirectional.



Producer is the first trophic level. As we move to higher trophic levels, the number of organisms keeps decreasing . This is to maintain a balance in the ecosystem. If the producers were not more than the consumers, then the consumers would simply starve to death.

Therefore, a greater number of individuals are  present in lower trophic levels.  

The flow of energy in a food chain is unidirectional. 


  • Assertion is true.
  • Reason is true.
  • Reason is not the correct explanation for assertion.

So, the correct answer is (b).

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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo