Q164 / 180 · AIIMS 2015 · Zoology

Assertion: The nymph of a cockroach undergoes moulting several times. Reason : There is gradual metamorphosis in cockroach.

  • Correct answer
    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
  • B
    Ifboth assertion and reason are true but reason is not the correct explanation of assertion.
  • C
    If assertion is true but reason is false.
  • D
    If both assertion and reason are false.

Solution

Gradual metamorphosis occurs in many insects such as cockroaches. In gradual metamorphosis, there are three stages: egg, nymph and adult. As nymphs, they moult several times (13 times in cockroach), but once they become adults they do not moult again. Nymphs are similar in shape to the adults, but smaller in size and without wings.

Hence, the correct answer is option: 'A'.

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