Question

Turgor movement is due to

• A. Reversible changes in cell volume by efflux and influx of $K^{+}$
• B. Synthesis of new cell-wall
• C. Irreversible change in cell volume
• D. None of the above

Answer 1

The correct option is A Reversible changes in cell volume by efflux and influx of $K^{+}$

Turgor growth movements are types of movements brought about by changes in turgor pressure of the cells, causing the movement. These may be divided into two types-

(i) Autonomous or spontaneous- which do not require any external stimulus and

(ii) Paratonic or induced- which require external stimulus.

The opening and closing of stomata by changes in turgidity of guard cells is an example of turgor movement.

The changes in turgidity of guard cells are brought about by changes in osmotic pressure due to movement of potassium ions.