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Question

What is common to whales, seals and sharks?


A

Thick subcutaneous fat

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B

Homoiothermy

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C

Seasonal migration

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D

Convergent evolution

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Solution

The correct option is D

Convergent evolution


The correct answer is Option D.

Explanation of the correct answer:

  1. Whales, seals, and sharks are marine and spend their entire lives in oceans.
  2. Thus, they have developed some similar organs.
  3. Appendages in whales, seals, and sharks are fin-shaped which helps in pushing through the water.
  4. The bodies of whales, seals, and sharks are streamlined and smooth.
  5. Whales, seals, and sharks have a single tail fin which is used for propulsion.
  6. These similar methods in whales, seals, and sharks for locomotion are examples of convergent evolution.

Explanation of the incorrect options:

Option A: Thick subcutaneous fat is the fat found under the skin. Thick subcutaneous fat is not common in whales, seals and sharks.

Option B: Homoiothermy is a phenomenon in which the temperature of the body of the organism is constant irrespective of the temperature of the surrounding. Whales, seals and sharks are not homoiotherms.

Option C: Seasonal migration is movement from one place to another on the basis of season. Seasonal migration is not seen in whales, seals and sharks.

Final answer: Convergent evolution common to whales, seals and sharks.


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