Study Set Content:
scattered throughout the mesophyll
Veins(Vascular bundles)
Consist of xylem and phloem tissues surrounded by a bundle sheath(jacket of thicker-walled parenchyma cells)
Veins(Vascular bundles)
Phloem transports sugars and other carbs throughout the plant while xylem transports water
Veins(Vascular bundles)
Give the leaf its skeleton
Veins(Vascular bundles)
parallel veins, do not have the mesophyll differentiated into palisade and spongy layers
Monocots
veins run in all directions
Dicots
Under dry conditions, bulliform cells
partly collapse
some grasses have large, thin walled bulliform cells on
either side of the midrib toward the upper surface
bulliform cells collapsing cause the leaf-blade
to fold or roll-reduces transpiration
receive less total light needed for photosynthesis
Shade Leaves
Shade Leaves have thinner and fewer
well-defined mesophyll layers and chlooroplasts
Shade leaves Tend to be larger than their counterparts
in the sun
-reduce water loss through transpiration
stomata are sunken below the surface in special depressions
Limited availability of water, wide temperature ranges, high light intensities developed adaptation of plant to allow to thrive
Leaves of Arid regions
Do not have as many hairs
Shade Leaves
Leaves of Arid Regions characteristics
thick, leathery leaves and fewer stomata, or stomata are sunken below the surface in special depressions
they may have dense, hairy coverings
Leaves of Arid Regions
Stems of plants in Arid regions can do what?
function in photosynthesis
May have succulent, water-retaining leaves or no leaves at all
Leaves of Arid regions
Modifications of Leaved of Arid Regions
sunken stomata, thick cuticle and a layer of thick-walled cells beneath the epidermis
