Q4 of 13 Page 159

Give reasons for the following.

Smoking increases the risk of blood clots.

Smoking increases the risk of blood clot because the inner lining of the artery gets damaged due to smoking. This makes the blood sticky as the lumen of artery gets constricted, thereby increasing the risk of blood clot.

The diagram depicts blood clot. The lumen of blood vessel can be seen constricted.



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2

The deficiency of thyroxine hormone in children is cretinism. It slows down growth. Apart from this, write one more disorder.

 3

Note the endocrine glands given in column A with their respective hormones in column B.

 4

Give reasons for the following.

Smoking aggravates asthma.

 4

Give reasons for the following.

Bean sprout is good for health.