HORTICULTURE

Detailed explanation-1: -Tropism is specific to the direction of the stimulus. Plants can either display a negative or positive movement in response to a stimulus. It is positive tropism when the movement is towards the direction of stimuli while it is negative tropism when the movement is away from the stimuli.

Detailed explanation-2: -There are two forms: Positive = the plant, or a part of it, grows in the direction from which the stimulus originates. and Negative = growth away from the stimulus. A tropism is a growth movement whose direction is determined by the direction from which the stimulus strikes the plant.

Detailed explanation-3: -Positive tropism is the movement or growth shown by organisms towards the direction of the stimulus. Therefore, organisms grow or move in the direction of the stimulus. For example, plant shoots grow upwards looking for sunlight. This is positive phototropism.