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SCIENCE CHALLENGE
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xylem carries water and minerals from roots to leaves and phloem carries food from leave to other parts
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Plants have a variety of developmental, physiological, and growth responses to light—sometimes only to particular wavelengths of light.
In phototropism a plant bends or grows directionally in response to light. Shoots usually move towards the light; roots usually move away from it.
In photoperiodism flowering and other developmental processes are regulated in response to the photoperiod, or day length.
Short-day plants flower when day length is below a certain threshold, while long-day plants flower when day length is above a certain threshold.
In many plants, photoperiodism is controlled by the overlap between the day length cue and the plant's internal circadian rhythms.
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