Trimethylamine oxide is an excretory product in

1. fresh water teleosts

2. marine teleosts

3. marine invertebrate

4. none of these.

Assertion   :       Secreting hypotonic urine is effective in reducing urinary loss of water.

Reason      :       Hypotonic urine is more concentrated and higher in osmotic pressure than the blood.

Urea remains in the kidney matrix of which of the following organisms?

1.Aquatic Insects

2.Aquatic amphibians

3.Bony fishes

4.Marine fishes