Question

Which statement about ammonia is false?

• A. Kidney does not excrete ammonia
• B. More water is required for ammonia excretion
• C. Ammonia is a more toxic substance
• D. Ammonia is converted into urea

Hint:

Ammonia is highly toxic and water-soluble — it must be excreted quickly or converted into less toxic forms like urea or uric acid.

Answer 1

The Correct Option is A

The kidneys do excrete ammonia, although in small amounts. Ammonia plays a role in maintaining acid-base balance in the body, and it is excreted in the urine in the form of ammonium ions.

• (A) This statement is false — kidneys do excrete ammonia. — Correct answer
• (B) This is true — ammonia requires a large volume of water for safe excretion because of its high toxicity.
• (C) This is true — ammonia is highly toxic and needs to be removed quickly.
• (D) This is true — in many organisms, ammonia is converted into urea (ureotelic organisms) to reduce toxicity.