Question

Which one of the following in real sense is NOT an excretory activity?

• A. Giving out carbon dioxide
• B. Passing out faecal matter
• C. Sweating
• D. Removal of urea.

Answer 1

The correct option is C Sweating

A) Giving out carbon dioxide is a part of respiration. Carbon dioxide is formed as a waste product of respiration and hence is not exactly an excretory activity.

B) Fecal matter is solid excretory product evacuated from the bowels after digestion of food.

C) Sweat glands in the skin secrete sweat or perspiration through which salts and trace elements are excreted. Sweating also maintains the level of salt in the body.

D) Removal of ammonia waste in the form of urea (in humans) is called excretion.

So the correct answer is 'Giving out carbon dioxide'.