Question

Thigmonasty refers to the nastic response of plant to ______.

• A. touch
• B. light
• C. water
• D. gravity

Answer 1

The correct option is A touch

Plants respond to their surroundings. The nastic response of the plants to touch is known as thigmonasty. Touch-me-not plant (or $Mimosa$ $pudica$ ) is an example of this type of movement. When we touch the leaves of touch-me-not plant, an electrical impulse is generated which acts on plant hormone and produces a response, i.e., closes it's leaves when touched.