Question

A plant cell may burst when

• A. Turgor pressure equalises wall pressure
• B. Turgor pressure exceeds wall pressure
• C. Wall pressure exceeds turgor pressure.
• D. None of the above.

Answer 1

The correct option is B

Turgor pressure exceeds wall pressure

The correct option is B.

Explanation of the correct option.

1. The turgor pressure is the pressure which allows the cell to maintain the shape of cell.
2. Due to endosmosis, water enters in the cell , this increase the turgor pressure.
3. The wall pressure is always equal to the turgor pressure .
4. When the turgor pressure will exceed beyond the wall pressure ,cell wall will burst.

Explanation of the incorrect options.

Option A:

1. If wall pressure is equal to turgor pressure, then no exchange of water takes place.
2. So, cell retain in its shape.

Option B:

1. Wall pressure is that pressure which exerted by the wall over the swelling protoplast.
2. So, it is not be a reason of cell burst.

Final answer : A plant cell may burst when turgor pressure exceeds wall pressure.