Question

give an experiment to show chemotropism.with diagram.

Answer 1

The movement shown by plants in response to specific chemicals is called chemotropic movement.The application of chemotropic movement in plants is called chemotropism.
The growth of pollen tube towards the ovule is a best example for chemotropism.(as mentioned in the figure attached)

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Answer 2

Answer:

Chemotropism: Movements due to chemical stimulus as seen during the pollen tube growth.

Activity:-

Aim: To study the response of plant to chemicals (chemotropism).

Explanation:

The response of plant to chemical stimulus is briefly explained below:

The ripe stigma of carpel ( female reproductive part ) of a flower secretes a sugary substance ( chemical) into the style towards the ovary. The pollen grains ( which fall on the stigma of the carpel ) respond to this sugary substance ( chemical stimulus) by growing respective pollen tubes in the downward direction in the style of the carpel. Generally, one pollen grain is successful in elongating its pollen tube to reach the ovule in the ovary of the flower. This happens to ensure fertilization in plant.

This response of pollen grain (that is growth of pollen tube) to sugary substance ( chemical stimulus ) secreted by the stigma of the carpel of a flower is an example of chemotropism.