Photoperiodism - Physiological response due to length of light exposure.
Photophosphorylation - Generation of ATP via photosynthesis.
Photorespiration - Metabolic pathway that uses oxygen and produces CO2.
Photoperiodism- The physiological response of an organism to the periodicity and duration of light and darkness which affects many processes including growth, flowering, and germination.
PHOTOPERIODISM - The response of plants to the length of a day and night (i.e. poinsettias, cactus, night blooming flowers)
PINCH OUT - Pinching with the fingers to remove the tip of a growing shoot to encourage lateral growth.
It is actually the plant's leaves that provide its color through a process called photoperiodism. This process, in response to certain amounts of light or lack thereof, turns the leaves from green to red (or pink, white, and other shade variations).
A plant that blooms when the length of day is either long or short. See also: photoperiodism.
GardenWeb Glossary of Botanical Terms
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 See also: Plant, Photoperiod, Neutral, Botanical, Epiphyte
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