Plant Orientation - Plant Behaviours

Tropism

Movement resulting from growth in response to an external stimuli

Phototropism

Growth response of a plant organ to a light stimulus

Gravitropism

Directional growth response of a plant organ to the stimulus of gravity

Thigmotropism

Directional growth of plants in response to rubbing on one side of a stem or tendril

Helotropism

Growth towards direction of the sun

Nastic Movement

Response of plant organs to stimuli that do not come from any particular direction

Turgor movement

reversible and caused by changes in cell water content, happening fast

Growth movements

by slow, permanent changes in cell size

Turgor pressure

A force pushing against cell wall due to influx of water into cells

Osmosis

Movement of water from an area of high concentration to an area of low concentration down a concentration gradient

Photonasty

A response to a change in light intensity

Thermonasty

A response to a change in temperature

Haptonasty

Leaf movement of a plant in response to a stimulus

Nyctinasty

Sleep movement where leaves/flowers of some plants adopt a different position at night

Etiolation

A plant that has reduced light/grown in the dark