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Zoology Multiple Choice Questions with Answers
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General Knowledge
yawning-occurs
Question
Yawning occurs-
A
due to excess concentration of O
2
in lungs
B
due to excess concentration of CO
2
in blood
C
due to excess concentration of CO
2
in lungs
D
None of the above
View Answer
Answer & Explanation
Answer: Option [B]
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NCERT Class 12 Biology Solved Multiple Choice Questions
