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Practice Listening: Fill in the Blanks (Type In)
ID: #37369
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Hormone 2
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The word hormone is derived from a Greek verb that means to excite. Hormones are found in all organisms and function to coordinate the parts of the organism. A hormone is a chemical signal. It is by one part of the body and is then transported to other parts of the body where it responses in cells and tissues. The concept of chemical messengers and plants first emerged from a series of experiments on how plant stands respond to light. Think about this, a houseplant on the windowsill grows toward light. If you rotate the plant, it will soon its growth until its leaves again face the window, the growth of a plant toward light is called photo . In a forest or other natural ecosystem where plants may be crowded.
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