Question

Some animals convert highly toxic $N{H}_3$ into least toxic trimethylamine oxide $\left(TMAO\right)$ and retain high concentration of $TMAO$ and urea to minimise $H_{2}O$ loss from body are

• A. Sharks and rays
• B. Fresh water bony fishes
• C. Myxine
• D. Marine bony fishes

Answer 1

The correct option is A Sharks and rays

• Marine teleost fishes excrete a large proportion of their nitrogen as trimethylamine oxide (TMAO). Large amounts of this compound is also stored in their body for osmoregulation i.e. to minimize loss of water and entry of salts.

So, the correct option is 'Sharks and rays'