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Excretory Products and their Elimination — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYExcretory Products and their Elimination1 Mark
MCQ
Stratum corneum is absent in:
  • A
    Bony fish
  • B
    Amphibians
  • C
    Reptiles
  • D
    All of the above
✓

Answer

  1. Bony fish

Explanation:

Corneous cell envelopes are absent in fish and first appeared in adult amphibian epidermis. Complete absence of a protective keratinized stratum corneum is compensated by the relatively thick squamous zone and the copious mucus secretion in fish.

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