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- #Diversity in Living World
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- #National Eligibility Cum Entrance Test - 2023
- #Biology
- #Class 11
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The unique mammalian characteristics are:
Hairs, tympanic membrane and mammary glands
Hairs, pinna and mammary glands
Hairs, pinna and indirect development
Pinna, monocondylic skull and mammary glands
Answers (1)
The correct answer is Option 2) Hairs, pinna, and mammary glands.
Hairs: Mammals are characterized by the presence of hairs or fur on their bodies. Hairs serve various functions such as insulation, protection, and sensory perception.
Pinna: The pinna refers to the external, visible part of the mammalian ear. It is a characteristic feature of mammals and helps in collecting sound waves and directing them into the ear canal.
Mammary glands: Mammary glands are unique to mammals and are responsible for producing milk to nourish the young. They are specialized glands that undergo development and enlargement during pregnancy and lactation.
For incorrect options,
Tympanic membrane: This is incorrect as the tympanic membrane, also known as the eardrum, is not unique to mammals. It is found in various animals, including reptiles, birds, and amphibians.
Indirect development: This is also incorrect as most mammals exhibit direct development, where the young are born in a relatively advanced state and undergo minimal or no metamorphosis.
Monocondylic skull: This is incorrect as the monocondylic skull, which refers to having a single occipital condyle, is not unique to mammals. It is found in various groups of vertebrates, including reptiles and amphibians.
Therefore, the correct answer is Option 2) Hairs, pinna, and mammary glands.
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