Question

Guard cell movements are an example of

• A. Turgor movement
• B. Tropic movement
• C. Nastic movement
• D. Tactic movement

Answer 1

The correct option is A Turgor movement

In most of the plants, stomata are surrounded by kidney bean shaped guard cells. The opening and closing of stomatal pore depend on the turgidity of guard cells. When guard cells are turgid stomatal pore open and when the guard cells lose turgidity, stomatal pore closes.

Tropic movement is the growth movement, example- stem is positively phototropic, while roots are positively geotropic.

Nastic movement is nondirectional responses, For example- thigmonasty showed by Mimosa pudica.

Tactic movement is a movement of an entire organism either in direction or in a direction opposite to the stimulus.

So, the correct answer is option A.