Question

What is tropism? How many types of tropism are there ?​

Answer 1

When the movement is towards the stimulus, it is called positive tropism. Likewise, when the movement is away from the stimulus, it is called negative tropism. While there are several forms of tropism, we'll just focus on three key types: phototropism, geotropism and thigmatropism.,

Answer 2

tropism is the action taken by plants in the response to the stimuli

They are of 5 types of tropism in ncert syllabus namely-

1 hydrotropism -stimuli(signal) is water

2 geotropism- stimuli is gravity

3 phototropism - stimuli is light

4 thigmotropism- stimuli is touch

5 chemotropism -stimuli are some particular substances