Question

Ammonia is converted into urea in

• A. Liver
• B. Kidney
• C. Ureters
• D. Stomach

Answer 1

The correct option is A

Liver

The correct option is A:

The explanation for the correct option:

Ammonia:

1. It is highly toxic and should not be accumulated in the body.
2. It requires a large amount of water for its removal.
3. It is highly soluble in water (H₂O).
4. It is produced in the body by the degradation of amino acids, amines, and nitrogenous bases.

Urea:

1. It is less toxic than ammonia.
2. It requires a moderate amount of water for its removal.
3. It can be transported by blood.
4. Animals that excrete urea are Ureotelic. e.g., Mammals.

Urea Formation:

1. Occurs by the conversion of ammonia into urea.
2. Ammonia deposited in the mitochondria of the hepatocytes of liver is converted to urea by the urea cycle.

The explanation for the incorrect options:

Option B:

1. The kidney excretes nitrogenous and other metabolic wastes from the blood in the form of urine.
2. It regulates blood ionic composition, blood pH, blood volume, blood pressure, etc.

Option C:

Ureters:

1. Two tube-like structures arise from the kidneys.
2. It carries urine formed in the kidneys to the urinary bladder.

Option D:

Stomach:

1. It is a J-shaped, muscular organ in the upper part of the abdomen.
2. The main functions of the stomach are digestion of food, temporary storage of food, mixing, and breaking down of food.

Final answer: Ammonia. is converted into urea in the Liver.