MCQ practice · SSC Biology Board questions · Chapter 8: Excretory System
Which is a function of the kidney?
Think it through first, then pick an option.
- a To remove waste substances from the body
- b To supply oxygen to the blood
- c To make the insulin the body needs
- d To produce red blood cells
Answer and explanation
Correct answer: a To remove waste substances from the body
The kidney removes waste substances from the body.
Why the other options are wrong
- b To supply oxygen to the blood: Supplying oxygen to the blood is the work of the lung, not the kidney.
- c To make the insulin the body needs: Insulin is a hormone of the pancreas, not of the kidney.
- d To produce red blood cells: Red cells are made in the bone marrow; they are not in the book's list of kidney functions.
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