HORTICULTURE

Detailed explanation-1: -The movement or growth of any part of a plant in response to an external stimulus is called tropism or tropic movement.

Detailed explanation-2: -A tropism is directional growth in response to a stimulus. A positive tropism occurs when a plant (or a part of the plant) grows towards the stimulus, and a negative tropism is growth away from the stimulus. Phototropism is directional growth in response to light (Figure 14.1.

Detailed explanation-3: -A tropism is a directional growth response to a stimulus, for example to light, water, or gravity. These responses can be the result of cells growing longer, or elongating, but this is not always the case. Tropisms may actually cause a change in direction of growth by inhibiting elongation of cells.

Detailed explanation-4: -Explanation of correct option-Thigmotropism is the directional growth movement of plants that occurs in response to the stimulus of touch. Thigmotropism is generally found in tendrils and creepers.

Detailed explanation-5: -Tropism is when a plant moves in response to an external stimulus in the environment. Positive tropism is when a plant moves towards a stimulus. Negative tropism is when a plant moves away from a stimulus.