Term
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Definition
| Broad portion of the leaf |
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Term
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Definition
| short stalk, which may or may not be present, composed mostly of vascular tissue that attches the blade to the stem. |
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Term
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Definition
| if the petiole is missing, the leaf is called this |
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Term
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Definition
| angle formes by the petiole and the stem |
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Term
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Definition
| small leaf like bracts (modified leaves) that can vary in size and shape |
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Term
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Definition
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Term
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Definition
| central vein of a pinnate leaf |
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Term
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Definition
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Term
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Definition
| the pattern followed by leaf veins |
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Term
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Definition
| Monocots have this (the veins run parallel to the leaf margin with no branching) |
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Term
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Definition
| Dicots have this :___(the veins are highly branched producing a net effect) |
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Term
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Definition
two types of
-Pinnate
-Palmate |
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Term
| Leaf arrangement: opposite |
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Definition
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Term
| Leaf Arrangement: Opposite |
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Definition
| There are two leaves at each node on opposite sides of the stem. |
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Term
| Leaf Arrangement: Alternate |
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Definition
| There is one leaf at each node on alternating sides of the stem (grasses always have this type of arrangement) |
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Term
| Leaf Arrangement: Whorled |
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Definition
| there are three or more leaves at each node |
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Term
| Structure of Leaves: Leaf epidermis |
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Definition
| a layer of transparent cells located on the upper and lower surfaces of leaf blades. Is covered by a thin waxy layer called the cuticle, which prevents the loss of water through epidermis cells. |
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Term
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Definition
| Contains specialized cells called guard cells, which form pores called stomata (stomate) -functions to regulate gas exchange |
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Term
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Definition
| contains mesophyll (palisade and spongy) tissue and vascular bundles |
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Term
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Definition
| cylindrical in shape and are located just below the upper epidermis |
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Term
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Definition
| are rounded and are located between the palisade cells and the lower epidermis ( corn leaves have only this type of mesophyll) |
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Term
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Definition
| (veins) are numerous in leaves to help the removal of sugar from photosynthesis |
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Term
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Definition
| Veins in leaves usually contain specialized cells called this (almost all photosynthesis in corn occurs in these cells) - these cells are very active in photosynthesis and more efficient than mesophyll cells because the product of photosynthesis (photosynthate) moves directly into the phloem. |
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Term
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Definition
-photosynthesis
-storage of plant food (mostly minor)
-translocate plant food
-gas exchange |
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Term
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Definition
the loss of water vapor from a plant through diffusion
-on average, a single plant can transpire 2 quarts of water a day (400,000 gallons per acre during the growing season) |
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Term
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Definition
95-97% of the total transpiration occurs through the stomata ; the other 3-5% is lost through the cuticle.
-Some woody plants (no crop plants) have lenticels in the stems where transpiration occurs as well. |
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Term
| Factor affecting transpiration: Temperature |
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Definition
| Relative Humidity : percent of water vapor in the air - warmer air holds more water than cooler air |
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Term
| Factors affecting transpiration : |
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Definition
-wind
-light: stomata open in response to light
-Soil water: stomata close when the leaves begin to lose more water through transpiration than is being supplied through the xylem
-Intercellular Carbon Dioxide |
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