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Breathing and Exchange of Gases — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYBreathing and Exchange of Gases1 Mark
MCQ
The alveoli in human lung are:
  • A
    3 crore
  • B
    300 million 
  • C
    350,000
  • D
    5 lakhs
✓

Answer

  1. 300 million

Explanation:

Alveoli are the site of respiration inside the lungs. The human lungs have 300 million alveoli with a total area of about 100m2 which is 50 times than that of the skin surface.

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