Question

Can someone define tropism and describe the different types of tropism exhibited in plants?

Answer 1

Tropism is a response to certain stimuli. A positive tropism is moving towards the stimuli, while a negative tropism is moving away from a stimuli.

Positive Phototropism - Growing towards light

Negative Phototropism - Growing away from light

Positive Thigmotropism- Moving towards touch

Negative Thigmotropism- Moving away from touch

Positive Hydrotropism - Growing towards water

Negative Hydrotropism - Growing away from water

Positive Gravitropism - Growing towards ground

Negative Gravitropism - Growing upwards

Answer 2

Hello.

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.