Question

Which is not true about vacuole?

• A. It is bounded by a single membrane called tonoplast
• B. It has hypotonic cell sap and transport of a number of ions and other materials
• C. In plant cell vacuoles can occupy up to 90 percent volume of the cells
• D. Contractile vacuole of amoeba is important for excretion

Answer 1

Answer: (B)

It has hypotonic cell sap and transport of a number of ions and other materials

Vacuoles are surrounded by a single membrane called Tonoplast which is a lipid bilayer. So statement A is correct.

The pH of vacuolar sap is acidic and hypertonic. It is filled with highly concentrated solution. So statement B is wrong.

Vacuoles usually occupy 30% of cell volume and can occupy up to 90%. so Statement C is correct.

Excretion in Amoeba usually occurs through the body surface but also through contractile vacuole. So statement D is also correct.

So, the correct answer is 'It has hypotonic cell sap and transport of a number of ions and other materials'.