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Elementary Notes on Structural Botany (Classic Reprint) - Hardcover

Church, A. H.

 
9780267803828: Elementary Notes on Structural Botany (Classic Reprint)

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Excerpt from Elementary Notes on Structural Botany

The most fundamental response is to sunlight, Heliotropism plant-shoots are normally positively heliotropic, and tend to lie pointed in the direction of Optimum light-effect (orthotropic); leaves are 'plagiotropic or tend to lie at right angles to incident light. The movement is originally a general growth-response; but may be differentiated, as effected by the petiole to display the lamina, implying a certain amount of conduction of stimulus, and foliage-leaves normally attain a fixed light position.

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