7th grade plant chapter
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| cellulose | chemical compound made by plants out of sugar | ||||
| cuticle | waxy, protective layer that covers the stems, leaves and flowers of many plants and prevents water loss | ||||
| vascular plant | plant with tubelike structures that move minerals, water and other substances throughout the plant | ||||
| nonvascular plant | plant that absorbs water and other substances directly through its cell walls | ||||
| rhizoids | threadlike structures that anchor nonvascular plants to the ground | ||||
| stomata | tiny openings in a plants epidermis through which carbon dioxide and water vapor gases enter and leave a leaf | ||||
| guard cell | pairs of cells that surround stomata and control their openings and closing | ||||
| gymnosperms | vascular plants that do not flower | ||||
| angiosperms | flowering vascular plants that produce fruit containing one or more seeds | ||||
| xylem | vascular tissue that forms hollow vessels that transport substances, other than sugar throughout a plant | ||||
| phloem | vascular tissue that forms tubes that transport dissolved sugar throughout a plant | ||||
| cambium | vascular tissue that produces xylem and phloem cells as a plant grows | ||||
| photosynthesis | food making process that takes place in the chloroplasts of plant cells | ||||
| chlorophyll | green, light trapping pigment in plant chloroplasts that is important to photosynthesis | ||||
| respiration | series of chemical reactions used to release energy stored in food molecules | ||||
| auxin | plant hormone that causes plant leaves and stems to exhibit positive phototropism | ||||
| tropism | positive or negative plant response to an external stimulus such as touch, light, or gravity | ||||
| photoperiodism | a plant's response to the lengths of daylight and darkness each day |
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Created by:
dlynns1
on 2007-03-08