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The unique mammalian characteristics are: (NEET 2023)
- a)hairs, tympanic membrane and mammary glands
- b)hairs, pinna and mammary glands
- c)hairs, pinna and indirect development
- d)pinna, monocondylic skull and mammary glands
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
The unique mammalian characteristics are: (NEET 2023)a)hairs, tympan...
Unique mammalian characteristics include:
- Hair or fur: Mammals are the only animals that have hair. This hair helps to insulate the body to maintain a constant body temperature.
- Mammary glands: These are glands that, in females, produce milk for the nourishment of young ones. This is a characteristic feature of all mammals and is, in fact, the feature that gives this group its name.
- The presence of pinnae (external ears): Most mammals have pinnae that help to collect and direct sound waves into the ear.
Option A is incorrect because while mammals do have a tympanic membrane (ear drum), it is not unique to mammals; other vertebrate groups, such as birds and reptiles, also have a tympanic membrane.
Option C is incorrect because indirect development is not a unique characteristic of mammals; many animals, including certain insects, amphibians, and fishes, undergo indirect development.
Option D is incorrect because a monocondylic skull, in which the skull only articulates with the first vertebra via a single condyle, is a characteristic of some reptiles and amphibians, not mammals. Mammals possess a dicondylic skull, with two occipital condyles.
So, the correct answer is :
Option B : hairs, pinna and mammary glands.
Option C is incorrect because indirect development is not a unique characteristic of mammals; many animals, including certain insects, amphibians, and fishes, undergo indirect development.
Option D is incorrect because a monocondylic skull, in which the skull only articulates with the first vertebra via a single condyle, is a characteristic of some reptiles and amphibians, not mammals. Mammals possess a dicondylic skull, with two occipital condyles.
So, the correct answer is :
Option B : hairs, pinna and mammary glands.
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The unique mammalian characteristics are: (NEET 2023)a)hairs, tympan...
Unique Mammalian Characteristics
Mammals are distinguished by a set of unique characteristics that set them apart from other vertebrates. The correct answer to the unique mammalian characteristics in the context of NEET 2023 is option B: hairs, pinna, and mammary glands.
Hairs
- Mammals are the only vertebrate group that possess hair.
- Hairs provide insulation, protection, and play a crucial role in sensory perception.
Pinna
- The presence of a pinna (external ear) is a defining feature of most mammals.
- It aids in sound localization and enhances hearing capabilities, which are vital for communication and survival.
Mammary Glands
- Mammary glands are specialized organs that produce milk to nourish offspring.
- This characteristic is exclusive to mammals, allowing for prolonged parental care and increased offspring survival.
Comparison with Other Options
- Option A (hairs, tympanic membrane, and mammary glands) lacks the pinna, which is significant for sound and communication.
- Option C (hairs, pinna, and indirect development) incorrectly includes indirect development, which is not a unique characteristic of mammals.
- Option D (pinna, monocondylic skull, and mammary glands) misses the essential feature of hairs that define mammals.
In conclusion, the combination of hairs, pinna, and mammary glands uniquely characterizes mammals, making option B the correct choice. Understanding these features underscores the evolutionary adaptations that have allowed mammals to thrive in diverse environments.
Mammals are distinguished by a set of unique characteristics that set them apart from other vertebrates. The correct answer to the unique mammalian characteristics in the context of NEET 2023 is option B: hairs, pinna, and mammary glands.
Hairs
- Mammals are the only vertebrate group that possess hair.
- Hairs provide insulation, protection, and play a crucial role in sensory perception.
Pinna
- The presence of a pinna (external ear) is a defining feature of most mammals.
- It aids in sound localization and enhances hearing capabilities, which are vital for communication and survival.
Mammary Glands
- Mammary glands are specialized organs that produce milk to nourish offspring.
- This characteristic is exclusive to mammals, allowing for prolonged parental care and increased offspring survival.
Comparison with Other Options
- Option A (hairs, tympanic membrane, and mammary glands) lacks the pinna, which is significant for sound and communication.
- Option C (hairs, pinna, and indirect development) incorrectly includes indirect development, which is not a unique characteristic of mammals.
- Option D (pinna, monocondylic skull, and mammary glands) misses the essential feature of hairs that define mammals.
In conclusion, the combination of hairs, pinna, and mammary glands uniquely characterizes mammals, making option B the correct choice. Understanding these features underscores the evolutionary adaptations that have allowed mammals to thrive in diverse environments.
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