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Topic 4 Lesson 4: Factors Influencing Growth

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Across
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A chemical that affects growth and development​
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a plant's response to seasonal changes in the length of night and day​
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Stems and leaves grow toward sources of light
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needed or necessary ​
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Any change or signal in the environment that can make an organism react in some way ​
Down
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The stems of plants respond to the stimulus of gravity by growing upward, away from gravity
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A hormone that controls a plant's growth and response to light​
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A period of time when an organism's growth or activity stops ​
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A type of rock that forms from an existing rock that is changed by hear, pressure, or chemical reactions​
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A plant's growth response toward or away from a stimulus​