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Zoology Multiple Choice Questions with Answers

Q.

Yawning occurs-

[A] due to excess concentration of O2 in lungs
[B] due to excess concentration of CO2 in blood
[C] due to excess concentration of CO2 in lungs
[D] None of the above

Answer & Explanation

Answer: Option [B]

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NCERT Class 12 Biology Solved Multiple Choice Questions

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