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Human Health and Disease — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYHuman Health and Disease1 Mark
MCQ
Tobacco smoke contains carbon monoxide, which:
  • A
    Reduces the oxygen-carrying capacity of blood.
  • B
    Causes gastric ulcers.
  • C
    Raises blood pressure.
  • D
    Is carcinogenic.
✓

Answer

  1. Reduces the oxygen-carrying capacity of blood.

Explanation:

Tobacco smoke ha 2-6% CO.The inhaled concentration is 400 ppm.

The gas combines with haemoglobin and forms an stable complex called carboxyhaemoglobin (COHb), thus reducing the concentration of haem bound oxygen.This causes oxygen deficiency in body.

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