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Plant Processes and Reproduction

stimuli are any changes in an organism's environment that cause a response.
tropism plant growth toward or a away from an external stimulus.
light leaves and stems tend to grow in the direction of light, root generally grow away from the light.
touch the structures called tendrils, help to hold the plants
gravity stem grows away from the gravity, but the root grow toward the gravity.
Auxins they grow toward light.
Ethylene helps stimulate the ripening of fruit.
Gibberellins increase the rate of the cell division and cell elongation.
Cytokenins increase the rate of cell division and slow the aging process of flowers and fruits.
photoperidism a plant's response to the number of hours of darkness in its environment.
Plant hormones a substance that acts as a chemical messenger within a plant.
Long-day Plants Plants that flower when exposed to less than 10-12 hours of darkness.
Short-day plants plants that require 12 or more hours of darkness for flowering to begin.
Day-Neutral Plants the flowering of some plant doesn't seem to be affected by the number of hours of darkness.
response any behavior of a living organism that results from an external or internal stimulus.
Created by: muangthonglink