Study Set Content:
veins fork evenly and progressively from the base of the blade to the opposite margin
dichotomous venation
In a few leaves like Gingko, no midvein or other large veins are present instead they have
dichotomous venation
How can the lower surface of the blade can be distinguished from the upper epidermis
stomata
Wavy, undulating walls of epidermal cells often resemble pieces of a jigsaw puzzle fit together. Except for
guard cells
the upper epidermal cells do not contain?
chloroplast, they function only in protecting delicate tissues to the interior
3 regions of the leaves
epidermis, Mesophyll, veins(vascular bundles in roots and stems)
The blade is covered by
an upper and lower epidermis
a photosynthetic tissue, that is often arranged into palisade and spongy layers
Mesophyll
single layer of cells covering the entire surface of the leaf
Epidermis
Veins branch throughout the
Mesophyll
different types of these may also occur in the epidermis
Glands
waxy-coating that is normally present although it may not be visible with ordinary light microscopes without being especially stained
Cutin(cuticle)
Glands occur in the form of
depressions, protuberances, or appendages either directly on the leaf surface or on the ends of hairs
Glands often secrete
sticky substance
stomata on both leaf surfaces
Corn and alfalfa
perforates the lower epidermis
stomata
stomata exclusively on the upper epidermis
Water lillies
stomata of submerged aquatic plants are
absent
how many stomata are there in the sunflower
2 million
Part of the epidermis that contains chloroplast
Guard cells
