General Science MCQs

Biology - Excretion Questions with solutions MCQs

1. Assertion (A): Marine fishes excrete nitrogenous waste primarily as ammonia.

Reason (R): Marine fishes are hyperosmotic, leading to high water retention.


A

Both A and R are true, and R explains A.

B

Both A and R are true, but R does not explain A.

C

A is correct, R is incorrect.

D

A is incorrect, R is correct.

Biology - Excretion Veterinary Pharmacist 2025
Correct Answer : C
Explanation :

Marine fishes excrete urea/trimethylamine oxide, not ammonia; so A is wrong.

Correct Answered :

Wrong Answered :

2. If loop of Henle were absent from nephron, what would be expected?

A

The urine will be more dilute

B

The urine will be more concentrated

C

There will be no urine formation

D

There will hardly be any change

Biology - Excretion Veterinary Pharmacist 2025
Correct Answer : A
Explanation :

Loop of Henle concentrates urine; without it urine is more dilute.

Correct Answered :

Wrong Answered :

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