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Diversity in Living Organisms — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceDiversity in Living Organisms1 Mark
MCQ
Hard calcium carbonate structures are used as skeleton by:
  • ✓
    Echinodermata.
  • B
    Protochordata.
  • C
    Arthropoda.
  • D
    Nematoda.
✓

Answer

Correct option: A.
Echinodermata.
a. Echinodermata.
Explanation:
Body wall of echinodermata is covered with spiny, hard, calcareous (calcium carbonate) plates (ossicles) that form a rigid or flexible endoskeleton.

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