Q138 / 180 · NEET 2016 (Phase 1) · Zoology

Which of the following features is not present in Periplaneta americana?

  • A
    Schizocoelom as body cavity
  • Correct answer
    B
    Indeterminate and radial cleavage during embryonic development
  • C
    Exoskeleton composed of N-acetylglucosamine
  • D
    Metamerically segmented body

Solution

Periplaneta americana shows indeterminate and spiral cleavage. 

The developing embryo of a cockroach is called nymphs. This nymph undergoes morphological change around 13 times to attain an adult form. Nymphs don’t have wings, but the last two changes develop a structure called a wing pad. This mode of cockroach development by various nymphal stages is called paurometabolous.

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

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