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| Openings between guard cells of a leaf; permit water vapor and gases to pass into and out of the leaf. |
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| One of the cells that surround a stoma and control the opening and closing of the stoma. |
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| The release of water from leaves through stomata. |
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| The leaf tissue that consists of closely packed, tall, thin cells that carry on the majority of the photosynthesis. |
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Definition
| The leaf tissue consisting of loosely packed cells that carry on photosynthesis; has air spaces between the cells. |
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Definition
| A chemical produced by living cells and transported to other body tissues where is causes a specific effect. |
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| The growth of plants in response to external stimuli such as light, gravity, or contact. |
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Definition
| The growth of a plant part in a certain direction in response to light. |
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Definition
| The growth of a plant part in a certain direction in response to gravity. |
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| The growth of a plant to changes in the length of daylight and night. |
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Definition
| Name a plant organ that absorbs water? |
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