Plant Movements – Definition and Key Points

The movements induced by some internal causes are called autonomic movement. It example is ciliary movement.
Paratonic movement The movement induced by external stimuli is called Paratonic mmement.
Tropic movement The movements in curvature  of  whole organ. towards or away form the stimuli    such as   light. gravity and touch are called tropic movement
Thigmotropism The tropic movement in response to stimulus of touch is called thigmotropism.
Chemotropism The tropic movement in response to some chemical is called chemotropism.
Hydrotropism The tropic movement of plant in  response  to stimulus of water is called hydrotropism.
Geotropism The tropic movements in response to gravity are called geotropism.
Cholodny and Went theory of photoperiodism Cholodny   and   Went   theory  suggested  that   the phototropicresponse     occur    due    to  unequal
distribution of auxin (IAA).
Cholodny and Went theory of geotropism This theory suggests that differential  growth  in geotropism is caused due to unequal distribution of auxin (IAA) in the upper and loner halves or the shoot.
Statocysts The cells containing amyloplasts are called statocysts.
Nyctinasty The  diurnal movements are called nyctinastic or



sleep movements.

Pulvinus The pulvinus is the swollen portion of petiole.
Seismonastic The shock movements are called Seismonastic.
The nastic movements occurs due to stimulus of touch are called Haptonastic movements.

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