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STD 11 - 14. Breathing and exchange in gases — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 14. Breathing and exchange in gases1 Mark
MCQ
Tobacco smoke contains carbon monoxide, which
  • ✓
    Reduces the oxygen-carrying capacity of blood
  • B
    Causes gastric ulcers
  • C
    Raises blood pressure
  • D
    Is carcinogenic
✓

Answer

Correct option: A.
Reduces the oxygen-carrying capacity of blood
a
Carbon monoxide has higher affinity to combine with haemoglobin of blood han oxygen. Tobacco smoke also contains carbon monoxide, so it reduces the oxygen carrying capacity of blood.

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