Study Set Content:
Niyog-niyogan Phyllotaxy, Shape/Form Leaf margin
Opposite, Oblong to elliptic, Undulate
Yerba Buena Phyllotaxy, Shape/Form Leaf margin
Opposite, Oblong-ovate, Crenate
Ulasimang bato Phyllotaxy, Shape/Form Leaf margin
Alternate, Heart-shaped, Entire
Why do leaves turn yellow during the
fall?
Sunlight during fall is insufficient to generate chlorophyll hence
the leaves turn yellow or red.
protects the leaf; retains water
Cuticle
secretes cuticle
Epidermis
Epidermis contains what that regulates gas exchange
Guard cells
division of epidermis
upper and lower epidermis
Guard cells contain?
Stomata
Columnar cells with spaces between cells
– Most chloroplasts are present here
Palisade Mesophyll
Consists of tube-shaped structures called xylem and phloem
Vascular tissue
Located below the palisade mesophyll
– Composed of irregularly shaped cells
– Leaf vascular tissue is found here
Spongy mesophyll
May have succulent, water-retaining leaves or no
leaves at all (stems function in photosynthesis) or they may have dense,
hairy coverings.
Leaves of Arid Regions
Receive less total light needed for photosynthesis. Tend to
be larger than their counterparts in the sun. Thinner and have fewer well-
defined mesophyll layers and fewer chloroplasts. Do not have as many hairs.
Shade Leaves
leaves of many cacti and other desert plants to reduce water loss
Spines
Submerged leaves of plants that grow in water
usually have considerably less xylem than phloem, and the mesophyll, not
differentiated into palisade & spongy layers, has large air spaces.
Leaves of Aquatic Areas
Help the plant in climbing or in supporting weak stems when
curled tightly around more rigid objects.
Tendrils
There is a mass of tightly packed, transparent water-
storage cells below the exposed end; these allow light coming through the
“windows” to penetrate to the chloroplasts in the mesophyll.
Window Leaves
air plants, a succulent, have little notches along
their leaf margins where new plants are produced with leaves and roots of
their own.
Reproductive Leaves
Insectivorous plants grow in swampy areas and
bogs of tropical and temperate regions. Certain elements particularly
nitrogen may be deficient in the soil, or they may be in the form not readily
available to plants.
Insect-Trapping Leaves
