Multiple choice

Spiny skin is a characteristic feature of

  1. echinoderms

  2. molluscs

  3. nematodes

  4. chordates
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A Correct answer
Explanation

Echinoderms (starfish, sea urchins, sea cucumbers) are characterized by their spiny skin, which gives the phylum its name (echino = spiny, derm = skin). This endoskeleton is made of calcareous ossicles beneath the epidermis and provides protection and structural support. This feature clearly distinguishes them from molluscs (soft-bodied), nematodes (smooth worms), and chordates.

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