Question

What will happen when a fresh water protozoan is placed in marine water?

Options

• The contractile vacuole will become larger in size.

• The number of contractile vacuole will increase.

• The contractile vacuole will disappear.

• The contractile vacuole will remain unchanged.

Answer 1

The contractile vacuole will disappear.

Explanation:

The contractile vacuole's function is to remove excess water from the body through the process of osmoregulation. In marine water, it is necessary to keep the water inside the body rather than expel it. If the contractile vacuoles do not disappear, the cell will become dehydrated.