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Handout
University of Hamburg

University of Hamburg: Photoperiodism and Stimulation

For Students 9th - 10th
A good summary of the photoperiodic effects of plants. Discussion of the way that the length of the day effects the growth of plants.
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eBook
McGraw Hill

Mhhe: Plant Growth and Growth Regulators

For Students 9th - 10th
A very good overview of the hormonal control of plant responses to different environmental cues. Good place to start research.