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Solution


Q.

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
1 A
2 B
3 C
4 D

Ans.

(a) Carbon monoxide has higher affinity to combine with haemoglobin of blood than oxygen. Tobacco smoke also contains carbon monoxide, so it reduces the oxygen carrying capacity of blood.