A response to a nondirectional stimulus, such as temperature or humidity, is a nastic movement.
2.
The ethylene produced causes nastic movements ( epinasty ) of the leaves, perhaps helping the plant to lose water.
3.
Nastic movements results from differential cell growth ( e . g . epinasty and hiponasty ), or from changes in turgor pressure within plant tissues ( e . g ., nyctinasty ), which may occur rapidly.
4.
Fundamental processes such as photosynthesis, respiration, plant nutrition, plant hormone functions, tropisms, nastic movements, photoperiodism, photomorphogenesis, circadian rhythms, environmental stress physiology, seed germination, dormancy and stomata function and transpiration, both parts of plant water relations, are studied by plant physiologists.
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