NEET 2023 Phase 1 · BiologyAves MammaliaPrevious Year Question
The unique mammalian characteristics are:
Answer: (B) hairs, pinna and mammary glands. The most unique mammalian feature is the presence of milk-producing mammary glands, while the skin uniquely possesses hair and external ears (pinnae) are present.
- A.Hairs, lymphatic membrane and mammary gland
- B.hairs, pinna and mammary glands✓
- C.hairs, pinna and indirect development
- D.pinna, monocondylic skull and mammary glands
Correct Answer
(B) hairs, pinna and mammary glands
Solution & Explanation
The most unique mammalian feature is the presence of milk-producing mammary glands, while the skin uniquely possesses hair and external ears (pinnae) are present. Mammalian development is direct, not indirect, so option (b) listing hairs, pinna and mammary glands is correct. NCERT Reference: Page 51, line 4
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