Question

Define tropism explain fiur kind of trooisms with one examples .

Answer 1

A growth movement of a plant part in response to an external stimulus in which the direction of stimulus determines the direction of response is called tropism .
kind of tropism are.
1.Phototropism:The movement of a plant part in response to light is called phototropism.
Example:Growth of stem.
2.Geotropism :The movement of plant part in response to gravity is called geotropism .
Example: Growth of root.
3.Hydro Tropism :The movement of plant part in response to water is called hydro tropism.
Example. Growth of root.
4.Chemo tropism :The movement of a plant part in response to chemical is called chemo tropism.
Example . The growth of pollen tube toward the ovuel.