Peristalsis

TROPISM Plant growth in response to a stimulus

TYPES OF TROPISM

PhototropismGeotropismHydrotropismChemotropismThermotropism

GEOTROPISM

Geotropism is the growth of a plant in response to gravity.Positive Geotropism It is the growth of a plant towards the center of the earth down with gravity.Negative GeotropismIt is the growth of a plant away from the center of the earth. PHOTO TROPISM

Photo tropism is the growth of plant in the direction of its light source.

Phototropism is the movement or growth of part of an organism towards a source of light, without overall movement of the whole organism.

Auxin distribution controls phototropism. This is the normal plant that has the sun positioned almost directly over the plant.

Phototropism is the growth of organisms in response to a light stimulus. It is most often observed in plants. HYDROTROPISM Hydrotropism is the growth in responseto water. Ex.roots growing toward moistre.

CHEMOTROPISM

Chemotropism is movement caused by chemical stimuli.Ex. Growth of a pollen tube is always towards the ovules so that reproduction can occur.

THERMOTROPISM Thermotropism is the tendency of plants or other organisms to bend toward or away from heat.

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