Download - Biology 23.4

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Page 1: Biology 23.4

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.


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