HORTICULTURE

Detailed explanation-1: -Thigmonastic movement is shown by some plants and fungi in response to touch. Thigmonastic movement is nastic movement and non-directional. The leaves of Albizia (related genus to Mimosa) exhibit thigmonastic movement. In Thigmonastic movement is, the leaves of plants get closed when stimuli touch.

Detailed explanation-2: -The movement of plant due to touch is known as a thigmotropic movement. Thigmotropism is a directional growth movement which occurs as a mechanosensory response to a touch stimulus. For example, once a shoot touches a suitable support, it grows towards the surface it is touching.

Detailed explanation-3: -The correct option is C Thigmonasty. In Greek, the prefix “thigmo-” refers to the touch stimuli and the suffix “-nasty” denotes the nastic movement; thus, the term “thigmonasty” indicates the coiling or curling up movement of plant structures when they are touched.

Detailed explanation-4: -An example of thigmotropism is the coiling movement of tendrils in the direction of an object that it touches. On the other hand, the folding movement of the Mimosa pudica leaflets, can be considered as an example of thigmonastism.