Question

What is meant by photo tropism and geotropism.

Answer 1

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◆Phototropism ◆
The growth and movement of a plant part in response to light is called phototropism.
There are two types of phototropism•
1- Positive phototropism
2- Negative phototropism

◆Geotropism◆
The downward movement of roots in response to gravitational force of earth is called geotropism.

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Answer 2

Gravitropism is a coordinated process of differential growth by a plant or fungus in response to gravity pulling on it. Gravity can be either "artificial gravity" or natural gravity. It is a general feature of all higher and many lower plants as well as other organisms.

Phototropism is the growth of an organism in response to a light stimulus. Phototropism is most often observed in plants, but can also occur in other organisms such as fungi. The cells on the plant that are farthest from the light have a chemical called auxin that reacts when phototropism occurs.