Multiple choice

Chitin as an exoskeleton is found in

  1. periplaneta

  2. ascaris

  3. pheretima

  4. hydra

  5. amoeba
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A Correct answer
Explanation

Chitin forms the exoskeleton in arthropods including Periplaneta (cockroaches). Ascaris and Pheretima are annelids (worms) that lack chitinous exoskeletons. Hydra is a cnidarian and amoeba is a protozoan - neither has a chitin exoskeleton. Chitin provides structural support and protection in arthropods.

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