The Nature And Work of Plants An Introduction to the Study of Botany
The book The Nature And Work of Plants An Introduction to the Study of Botany was written by author Daniel Trembly Macdougal Here you can read free online of The Nature And Work of Plants An Introduction to the Study of Botany book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Nature And Work of Plants An Introduction to the Study of Botany a good or bad book?
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Heliotropic movements. — The action of the leaf or stem for placing the blades in the proper posi- tion for receiving light in response to the sensitive- ness of the plant to light is termed heliotrojnsm. This may be observed in house plants grown by a window. Here all of the leaves have moved in such manner as to make their blades face the window. If such a plant is turned halfway round so that the leaves face away from the window, they will quickly regain their former position. Perform this e...xperi- 74 THE NATURE AND WORK OF PLANTS ment with a geranium, and note the position of the leaves five or six hours and a day later. Repeat the experiment by bringing a plant from the open air and placing it in a box with one small opening. Sketch the position of the stems and leaves and do the same a day later. In what region has the movement taken place, the leaf stalk or the stem to which it is attached? The movements of roots away from the light, § 46, are to be recalled in this connection.
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