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| tiny openings in a plant's epidermis through which carbon dioxide, water vapor, and oxygen enter and exit |
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| green, light-trapping pigment in plant chloroplasts that is important in photosynthesis |
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| process by which plants, algae, and many types of bacteria use light energy to produce a simple sugar from carbon dioxide and water and give off oxygen |
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| series of chemical reactions used to release energy store in food molecules |
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| positive or negative plant response to an external stimulus such as touch, light, or gravity |
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| plant hormone that causes plant leaves and stems to exhibit positive phototropisms |
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| a plant's response to the lengths of daylight and darkness each day |
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| plant that generally requires short nights less--less than ten to 12 hours of darkness--to begin the flowering process |
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| plant that generally requires long nights--12 or more hours of darkness--to begin the flowering process |
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| plant that doesn't require a specific photoperiod and can begin the flowering process over a range of night lengths |
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