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bio l0l leaves
leaves
| Question | Answer |
|---|---|
| photosynthetic organs that appear in diverse shapes and features and can be used to identify the plant are | leaves |
| main part of a leaf. Flat, lightweight easily supported. much surface area for capturing sunlight and gas exchange with the atmosphere. | blade |
| stalk, narrower. attaches the leaf to the stem or a branch. | petiole |
| vascular bundles of the stem that pass thru the petiole | veins |
| MIDRIB or central vein | netted veination |
| several midveins or large veins coursing in the same direction | parallel veination |
| dicot leaves have | wide blades, petioles, horizontal leaves, & netted veination. |
| monocot leaves have | long blades, NO petioles, vertical leaves, & parallel veination. |
| protects the leaf has a cuticle and stomata | upper epidermis |
| secrete the cuticle, flat like tiles. | lower epidermis |
| prevents evaporation or sogging of the leaf, impedes gas exchange with the environment. its upper surface is shiny and thick and lower surface is dull and thin. | cuticle |
| leaf pores | stomata |
| open and close the stomata | guard cells |
| 2 layers of closely packed brick like cells, standing on end; absorb light, dicots only, horizontal leaves. | palisade mesophyll |
| 2-3 or more layers of loosely packed cells, with many air spaces between. gas exchange dicots horizontal leaves. | spongy mesophyll |
| All cells are same shape and size, monocots only, vertical leaves | uniform mesophyll |
| run thru spongy mesophyll in dicots with horizontal leaves. | leaf veins |
| the normal process in which plants shed their leaves is called | leaf abscission |
| all drop off in autumn, many angiosperms | deciduous leaves |
| drop gradually but never completely when the plant is alive(gymnosperms- needles; angisperms-tropical broad leaves) | Evergreen leaves |
| A series of days at a cool temperature when a separation layer forms, the cell swells, enzymes digest there walls, and wind rain and animals help the leaves fall | abscission zone |
| photosynthesis, gas exchange, protect the plant, support the plant, storage, nourishment, and transport are all | functions of a leaf |
| transport sends food down ward for storage in | stems & roots |
| transport sends food upwards for storage in | flowers and fruit |
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