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SPONGY LAYER
- * the leaf layer that has many air spaces between its cells
- *causes the underside of a leaf to have a lighter shade of green than the top side because the air spaces allow for less chlorophyll
- *is not found in roots
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STOMATA
*the tiny openings on the underside of leaves
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ROOT HAIRS
*the tiny extensions in the epidermis cells of the root that help them to absorb water
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GUARD CELLS
- *the pair of cells that regulate the size of the stomata
- *plants might suffer excessive water loss if this malfunctions
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TRANSPIRATION
- * when water vapor passes out of the leaf through the stomata
- * water vapor is lost
- *this process is most directly linked with the function of the guard cells
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LENTICELS
- * tiny openings in bark that allow the exchange of gases in woody areas of plants
- *basically aids in gas exchange
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ALL AFFECT WATER TRANSPORT
- * Narrow cells of xylem
- * transpiration
- * osmosis
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PLANT HORMONES
- *chemical that.. . .
- *are used to
- -kill weed
- -control fruit ripening
- -root cuttings
- *auxin is a type of this
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GRAVITROPISM
* a plant�s response to gravity
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NASTIC MOVEMENTS
- * what makes morning glory flowers open in the morning, close in the afternoon, and open again the next morning.
- *controls the Venus Fly Trap
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TROPISM
* a plant�s growth responses of plants to their environment (such as light, gravity, etc.)
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PALISADE LAYER
- *made up of tall, thin, closely packed cells
- *located under the upper epidermis
- *contains the most chloroplasts in a leaf
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PHOTOPERIODISM
- * a plant�s growth in response to the length of time it is exposed to light
- *the time when plants flower is determined by this
- *chemical phytochrome is associated with it and poinsettias
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DAY-NEUTRAL PLANTS
- *are not affected by the length of day
- *bloom regardless of the length of day
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SUGAR, STARCH, OIL
- *plants store energy in the form of
- *plants might suffer excessive water loss if this malfunctions
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TRANSPIRATION
- * when water vapor passes out of the leaf through the stomata
- * water vapor is lost
- *this process is most directly linked with the function of the guard cells
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MOVEMENT OF WATER
- THROUGH A PLANT
- * Root hair, root, xylem, stomata
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VASCULAR CAMBIUM
- * helps form both xylem and phloem
- *found between the xylem and phloem of a plant
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PHLOEM
* the tissue of the plant that carries sugar from the leaf to other parts of the plant
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POSITIVE GRAVITROPISM
*a plant�s roots exhibit
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POSITIVE PHOTOTROPISM
*a plant�s stem and leaves turn toward light exhibit
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