Question

Excretion is the removal of

• A. Nitrogen
• B. Nitrogenous waste
• C. Waste
• D. All waste

Answer 1

The correct option is B

Nitrogenous waste

The correct answer is option B.

Explanation of correct option:

1. The process of removing all toxic or harmful substances from the body of an organism is termed excretion. In humans, there are various excretory organs to remove excess amounts of nitrogen from the nitrogen compounds.
2. Nitrogenous waste is all the excess amount of nitrogen compounds produced by protein metabolism.
3. Urea and Creatinine are nitrogenous substances produced by the human body.

Explanation of incorrect options:

Option A: Nitrogen is required for many cellular functions and only an excess amount of nitrogen needs to be removed from the body.

Option C: Waste is a general term. The excretion term is used specifically for the removal of nitrogenous waste from the body.

Option D: The term excretion is not used for the removal of all kinds of waste.

Excretion is the removal of nitrogenous waste.