Question

Read the assertion and reason carefully to mark the correct option in question.

Assertion: Sebum provides a protective oily covering for the skin.
Reason: Small amounts of nitrogenous wastes would be eliminated through saliva too.

Answer 1

• Sebaceous glands excrete substances like sterols, hydrocarbons and waxes through sebum. This secretion is constituted by lipid molecules. Being water-insoluble, the oily layer provides a protective oily covering for the skin. Hence, the given assertion is correct.
• Saliva contains compounds such as small amounts of nitrogenous wastes like urea, electrolytes/ dissolved ions, enzymes etc. Thus small amounts of nitrogenous wastes like urea can be eliminated through saliva. Hence, the given reason is correct.
• Hence, option (B) is correct: If both assertion and reason are true but reason is not the correct explanation of the assertion.