Question

Turgor movements occur in response to

• A. Stimulation of amyloplasts
• B. Activation and deactivation of phytochrome
• C. Circadian rhythm
• D. Changes in $K^{+}$ ion concentration

Answer 1

The correct option is D Changes in $K^{+}$ ion concentration

Turgor movement is a reversible change in position of a plant part due to a change in turgidity of cells. It is mostly caused by contact. In plants, turgor changes occur in thin walled cells of pulvinus present on lower side and pulvinnules present on upper side. Both side has different concentration of potassium and calcium ions. Upon touching, potassium ion concentration changes in the cells which results in turgor movement.

Thus, the correct answer is option D.