Download - Biology 23.4
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23.4 LEAVES
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BLADE
Thin, flattened section of a plant leaf that collects sunlight
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PETIOLE
Thin stalk by which a leaf blade is attached to a stem
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MESOPHYLL
Specialized ground tissue that makes up the bulk of most leaves; performs most of a plant’s photosynthesis
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PALISADE MESOPHYLL
Layer of tall, column-shaped mesophyll cells just under the upper epidermis of a leaf.
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SPONGY MESOPHYLL
Loose tissue beneath the palisade layer of a leaf
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STOMA
Opening in the underside of a leaf that allows carbon dioxide and oxygen to diffuse into and out of the leaf
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GUARD CELL
Specialized cell in the epidermis of plants that controls the opening and closing of stomata by responding to changes in water pressure
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TRANSPIRATION
Loss of water from a plant through its leaves
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KEY CONCEPT
The structure of a leaf is optimized for absorbing light and carrying out photosynthesis.
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KEY CONCEPT
Plants keep their stomata open just enough to allow photosynthesis to take place but not so much that they lose an excessive amount of water.