Nastic movement is in response to

Explanation

Nastic movement is a type of movement in plants that is not directional. This means that the movement does not occur in response to a particular direction. The correct option for the question is Option C: Non-directional stimuli. Plants undergo various types of movements in response to different stimuli. For example, tropism is a type of movement that occurs in response to directional stimuli such as light, gravity, and touch. However, nastic movements are different from tropisms as they are not directional. Nastic movements occur in response to non-directional stimuli such as temperature, humidity, and touch. These movements are rapid and reversible and can be either inwards or outwards. For example, the closing of the leaves of the Venus Flytrap in response to touch is a nastic movement. In summary, nastic movement is a type of plant movement that is not directional and occurs in response to non-directional stimuli. The correct option for the question is Option C: Non-directional stimuli.