The organ that is responsible for the detoxification of ammonia to urea in humans is the: MCQ with Answer and Explanation

The organ that is responsible for the detoxification of ammonia to urea in humans is the:
A. Kidney
B. Liver
C. Spleen
D. Pancreas
Answer: Option B
Solution (By JKSSB Mock Tests)
The liver converts toxic ammonia (from amino acid deamination) into less toxic urea via the urea cycle (ornithine cycle) in hepatocytes. Urea is then excreted by the kidneys. The kidneys filter urea but do not produce it. Pancreas produces enzymes/hormones, spleen filters blood.

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Practice More Biology Questions

Question #1
In genetics, the 'Hardy-Weinberg equilibrium' can be disrupted by several evolutionary forces. Which of the following is NOT a factor that disrupts this equilibrium?
A. Mutation
B. Genetic drift
C. Random mating
D. Gene flow (migration)

Correct Answer: Option C


Explanation:
The Hardy-Weinberg principle states that allele and genotype frequencies in a population will remain constant (in equilibrium) from generation to generation in the absence of evolutionary influences. The conditions required for this equilibrium are: no mutation, random mating, no gene flow (migration), very large population size (no genetic drift), and no natural selection. Therefore, random mating is a condition that MAINTAINS the equilibrium, not a factor that disrupts it. Non-random mating would disrupt it.

This question belongs to: Science Biology
Question #2
During the depolarization phase of an action potential, there is a rapid influx of:
A. Chloride ions (Cl-)
B. Potassium ions (K+)
C. Calcium ions (Ca2+)
D. Sodium ions (Na+)

Correct Answer: Option D


Explanation:
An action potential is initiated when a stimulus causes the membrane potential to reach a threshold. This opens voltage-gated sodium channels, leading to a rapid influx of sodium ions (Na+) into the neuron. This makes the inside of the cell positively charged relative to the outside, a process called depolarization. Repolarization follows with the efflux of K+ ions.

This question belongs to: Science Biology
Question #3
Apical dominance in plants is primarily controlled by which hormone?
A. Auxin
B. Gibberellin
C. Ethylene
D. Cytokinin

Correct Answer: Option A


Explanation:
Apical dominance is the phenomenon where the main central stem (apical bud) grows more strongly than the side stems (lateral buds). This is primarily controlled by auxin (specifically IAA), which is produced at the shoot apex and moves downwards, inhibiting the growth of lateral buds. Removal of the apical bud promotes lateral branching.

This question belongs to: Science Biology