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12 terms

leaf cross section

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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
cuticle
Waxy, protective layer that covers the stems, leaves, and flowers of many plants. Helps prevent water loss.
mesophyll
The ground tissue of a leaf, sandwiched between the upper and lower epidermis and specialized for photosynthesis.
air space
The area in the spongy mesophyll where carbon dioxide is changed into oxygen
guard cell
Pairs of cells that surround stomata and control their opening and closing.
lower epidermis
protective layer on the bottom of leaf which contains stomata & guard cells
vein
in plants, a cluster of vascular tissue in leaves
upper epidermis
cell layer that protects the leaf from drying out
vascular tissue
tissue that conducts water and nutrients through the plant body in higher plants
bundle sheath cells
Cells in the leaves of C4 plants in which the four-carbon acids produced during carbon fixation are broken down to three-carbon acids and CO2.
spongy mesophyll
Loosely arranged photosynthetic cells located below the palisade mesophyll cells in a leaf.
paliside mesophyll
One or more layers of elongated photosynthetic cells on the upper part of a leaf.