MCQ practice · SSC Biology Board questions · Chapter 8: Excretory System
The causes of kidney stones are-
- i. obesity
- ii. drinking little water
- iii. intestinal infection
Think it through first, then pick an option.
- a i and ii
- b i and iii
- c ii and iii
- d i, ii and iii
Answer and explanation
Correct answer: a i and ii
Obesity and little water are both causes in the book; it is infection of the kidney, not the intestine.
Why the other options are wrong
- b i and iii: iii is false: the cause is infection of the kidney, not of the intestine; and the true ii is left out.
- c ii and iii: iii is false because intestinal infection is not a cause; and i is left out.
- d i, ii and iii: iii is false: intestinal infection is not a cause in the book.
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