By,Georgina.P

Induced Movements.

Tropic Movements.

The movements of plant which are directional, either towards the stimulus or away from it, are called Tropic Movements.

Tropism.

A tropism is a biological phenomenon, indicating growth or turning movement of a biological organism, usually a plant, in response to an environmental stimulus.

Types of Tropic Movements.

*Phototropism

*Geotropism

*Chemotropism

*Hydrotropism

Phototropism.

The bending of a plant towards the light is called as phototropism.

It is the growth and response to a light stimulus.

Geotropism.

The downward movement of a plant in response to gravitational force is called geotropism.

Geotropism is also known as gravitropism.

http://en.wikipedia.org/wiki/File:Upsidedown-tree.JPG

Chemotropism.

The growth and movement of plants navigated by a chemical stimulus from outside the plant.

An example of chemotropic movement can be seen during the growth of the pollen tube.

It can be also written that conversion of a flower into fruit is the example of chemotropism.

Hydrotropism.

Hydrotropism is a plant's growth response in which the direction of growth is determined by a stimulus in water concentration.

Quiz Time!The movement or growth of plants in response to gravity is known as _______________.

The movement or growth of plants in response to lights or colours of light is known as _________.

The movement or growth of plants in response to water is known as _____________.

The movement or growth of plants in response to chemicals is known as ____________.