Q. Consider the following statements:
Assertion (A): In a forest ecosystem, the pyramid of numbers is generally inverted.
Reason (R): A few large-sized trees support a greater number of herbivores, parasites, and hyperparasites at successive trophic levels.
For the Assertion (A) and Reason (R) below, choose the correct alternative from the following.

[A] Both A and R are true, and R is the correct explanation of A

[B] Both A and R are true, but R is not the correct explanation of A

[C] A is true, but R is false

[D] A is false, but R is true

Answer: A
Notes:

Explanation:

  • In forest ecosystems, the pyramid of numbers is inverted because a small number of large-sized producers (trees) support a greater number of herbivores (like birds), parasites, and hyperparasites at higher trophic levels.
  • Thus, both the assertion and reason are correct, and the reason appropriately explains why the pyramid is inverted in forest ecosystems.

Source: Environment (NCERT)

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