Unit 4 Flashcards
Guard Cells
specialized cells in the epidermis that control the opening and closing stoma by responding to changes in water pressire
Air spaces
spaces of air
Mesophyll
cells packed with chloroplasts and carry out nearly all photosynthetic activity of most plantd
(Waxy Cuticle)
in plants a thick waxy layer on exposed outer surfaces of cells that protects them in water loss and injury
Stoma
pore like openings in the underside of the leaf that allow carbon dioxide and oxygen to diffuse in and out of the leaf
Upper Epidermis
a single layer of cells containing few or no chloroplasts
Palisade Mesophyll
closely packed cells that absorb much of the light that enters the leaf
Spongy Mesophyll
a loose tissue with many air spaces between its cells
Vein (vascular bundle)
in plants a cluster of vascular tissue in leaves
Xylem
vascular tissue that carries water upward from the roots to every part of the plant
Phloem
vascular tissue responsible for the transport of the nutrients and the carbs produced by the photosynthesis