steroid hormones in plants that have a variety of effects
The turning or bending movement of an organism or a part toward or away from an external stimulus, such as light, heat, or gravity.
Directional growth of a plant organ in response to a gravitational field roots grow downwards, shoots grow upwards. Achieved by differential growth on the sides of the root or shoot. A gravitation field is thought to be sensed by sedimentation of statoliths (starch grains) in root caps.
specialized starch containing plastids, settle to lower part of cell
a plants response to chronic mechanical stimulation
The change in membrane potential occurring in nerve, muscle, or other excitable tissue when excitation occurs.
A daily rhythmic activity cycle, based on 24-hour intervals, that is exhibited by many organisms
The response of an organism to changes in its photoperiod, especially as indicated by vital processes
a plant that flowers only when the light period is shorter than a critical length