| Term | Definition |
|---|
| provide surface area for photosynthesis | what is the function of a leaf? |
| petiole | the structure that holds the leaf to the lateral shoot |
| cutin | thin, waxy layer which covers the leaf (not composed of cells). It may be present on either top and bottom, or just the top of the leaf, It helps prevent water loss |
| upper epidermis | single protective layer of cells along the top edge of the leaf |
| palisade layer | rectangular photosynthetic cells directly below the upper epidermis (normally green) |
| spongy layer | loosely arranged photosynthetic cells below the palisade layer (normally green). causes silvery appearance |
| lower epidermis | thin, protective single layer of cells along the bottom edge of the leaf |
| stomata | opening along the lower epidermis that allows gas exchange (carbon dioxide) |
| guard cells | cells surrounding the stomata (green) that control stomata opening and closing |
| veins | groups of thick walled cells forming round tubes withing the spongy layer, usually surrounded by a single layer of cells forming a tube which transports needed materials throughout the leaf (contains xylem and phloem) |
| air space | large empty spaces within the spongy layer |
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