Term
THE LEAF TISSUES & GAS EXCHANGE
LENTICEL |
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Definition
* An area of pores on the bark of some trees that allows gas exchange between the air& the inner part of the trunk
*One of many raised pores in the stem of a woody plant that allows gas exchange between the atmosphere and the internal tissues |
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Term
THE LEAF TISSUES & GAS EXCHANGE
MESOPHYLL |
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Definition
* A general term for the two types of tissue found between the upper epidermis & the lower epidermis
*The inner tissue of a leaf, containing many chloroplasts
*The most important role of the mesophyll cells is in photosynthesis. Mesophyll cells are large spaces within the leaf that allow carbon dioxide to move freely |
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Term
THE LEAF TISSUES & GAS EXCHANGE
PALISADE TISSUE CELL |
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Definition
*A cell where photosynthesis occurs & found just below the upper epidermis of leaves
* Are plant cells located on the leaves, right below the epidermis and cuticle. They are vertically elongated, a different shape from the spongy mesophyll cells beneath them. The chloroplasts in these cells absorb a major portion of the light energy used by the leaf |
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Term
THE LEAF TISSUES & GAS EXCHANGE
SPONGY MESOPHYLL TISSUE |
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Definition
* A layer of loosely packed cells that allows for movement of gases within the leaf; found between the palisade cells & the lower epidermis
*Spongy mesophyll In a leaf, mesophyll tissue comprising cells of irregular shape, some of them lobed, separated by large spaces in which the atmosphere is humid. Spongy mesophyll is the site of gaseous exchange for photosynthesis and respiration |
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Term
THE LEAF TISSUES & GAS EXCHANGE
TRANSPIRATION |
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Definition
* The process of water leaving a leaf through the stomata
* Transpiration is the process of water movement through a plant and its evaporation from aerial parts, such as leaves, stems and flowers. Water is necessary for plants but only a small amount of water taken up by the roots is used for growth and metabolism |
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