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NEET 2023, Biology Q81: Classification of Chordates

NEET2023Biology
Q.

The unique mammalian characteristics are:

  1. A

    hairs, tympanic membrane and mammary glands

  2. B

    hairs, pinna and mammary glands

  3. C

    hairs, pinna and indirect development

  4. D

    pinna, monocondylic skull and mammary glands

Solution

Three features unique to mammals: hairs covering the body, an external pinna of the ear, and mammary glands for nourishing the young. The tympanic membrane is also present in amphibians and reptiles. Mammalian skulls are dicondylic (two occipital condyles), not monocondylic. Most mammals show direct development, not indirect.

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