Sci. ch. 5
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10 terms
Terms | Definitions |
|---|---|
 stomata | tiny openings in a plant's epidermis through which carbon dioxide and water vapor gases enter and leave a leaf. |
| chlorophyll | green, light-trapping pigment in plant chloroplasts |
| photosynthesis | process by which plants and many other producers use light energy from the Sun to make sugars, which can be used as food. |
| respiration | series of chemical reactions used to release energy stored in food molecules. |
| tropism | positive or negative plant response to an external stimulus such as touch, light, or gravity. |
| auxin | plant hormone that causes plant leaves and stems to exhibit positive response to light |
| photoperiodism | a plant's response to the lengths of darkness each day. |
| long-day plant | a plant that requires less than 10 to 12 hours of darkness to flower |
| short-day plant | a plant that needs 12 or more hours of darkness to flower |
| day-neutral plant | a plant that has no specifi.c photoperiod, and the flowering process can begin within a range of hours of darkness |
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