Question

Which of the following waste can be removed by skin?

(i) Water

(ii) Excessive mineral salts

(iii) Urea

• A. (i) only
• B. (i), (ii), and (iii)
• C. (i), (iii)
• D. (iii), (ii)

Answer 1

The correct option is B (i), (ii), and (iii)

The skin has sweat glands that secrete a fluid waste called sweat, which contains water, urea, amino acids, glucose, and NaCl. Its pH is 4.5.

So, the correct answer is option B.