Question

What is tropism ?Write its types

Answer 1

A trophism is a biological phenomenon, indicating growth or turning movement of a biological organism, usually a plant, in response to an environmental stimulus. ... Tropisms are typically associated with plants.
it is of two types;
positive trophism and negative trophism..
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Answer 2

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The growth movement of a plant part in response to an external stimulus in which direction of stimulus determine the direction of response is called tropism

It is two types:

1. positive tropism

2.: Negative Tropism

Positive tropism: If the growth of a plant part is toward the stimulus it is called positive tropism.

Negative Tropism : if the growth of a plant part is away from the stimulus , then it is called Negative Tropism

There are five common stimuli in the environment.

stimulus. Types of tropism

Light. ----> Phototropism

Gravity. ----> Geotropism

Chemical. ---> chemotropism

Water. ----> Hydrotropism

Touch. ---> Thigmotropism