Question:
Blowhole, present in aquatic mammals, helps in
Blowhole, present in aquatic mammals, helps in
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Marine Mammal Anatomy: The BLOWHOLE represents modified dorsally positioned nostrils dedicated to aerial PULMONARY RESPIRATION.
Updated On: Sep 7, 2026
- Reproduction
- Echolocation
- Feeding
- Respiration
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
Marine mammal respiratory adaptations: cetaceans (whales, dolphins, porpoises) possess dorsally displaced cranial nares (blowholes) for atmospheric aerial respiration at the water surface.
Step 2: Detailed Explanation:
In marine mammalogy and respiratory physiology:
- Aquatic cetaceans (Whales, Dolphins, Porpoises) are air-breathing homeothermic mammals with lungs rather than gills.
- Evolutionary adaptation has migrated their external nasal openings (nostrils) to the dorsal apex of the skull, forming a specialized, muscularly sealed Blowhole (single in odontocetes/toothed whales, paired in mysticetes/baleen whales).
- The blowhole functions exclusively for Atmospheric Respiration (Gas Exchange Breathing) when surfacing, forcefully expelling warm, moisture-laden exhaust air (the 'spout/blow') and inhaling oxygen before diving.
Step 3: Final Answer:
Therefore, the blowhole helps in Respiration, matching option (D).
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