leaves pages 578; 595 - 597. a. function co 2 + h 2 0 c 6 h 12 o 6 + o 2 carry out photosynthesis...
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B. Parts of the Leaf
the upper & lower surface of the
leaf that functions in protection
2. Epidermis - single layer on
1. Cuticle - thin, waxy outer layer
that prevents the loss of too
much water
Parts of the Leaf
(food)
b. Phloem - transports sugar
a. Xylem - transports water
4. Vein - bundles of vascular tissues
3. Mesophyll - area where there are cells with chloroplasts; area of photosynthesis
Parts of the Leaf5. Stomata - tiny pores on the lower surface that allows carbon dioxide to enter and water & oxygen to exit the leaf during photosynthesis; allows oxygen to enter and water & carbon dioxide to exit the leaf during respiration
Parts of the Leaf6. Guard Cells - opens & closes
the stomata; regulates gas
exchange and water loss
stomata closed
stomata open
* More than 90% of the water taken up by the roots are lost to the atmosphere as water vapor (through the stomata); this is called transpiration
cuticle
upper
epidermis
lower
epidermis
vascular tissues
(xylem & phloem)
guard cellsstomata
mesophyll
Leaf Adaptation:
collect sunlight (tropical)3. Broadleaf: large, flat leaves to
reduce water loss2. Pine Needles: thin and waxy to
photosyntheticreduce water loss; they are not
1. Cactus: “thorns” are thin to
Leaf Adaptation:
enzymescontains rainwater and digestiveto “funnel” insects; the “pitcher”
a. pitcher plant: leaves are shaped
4. Carnivorous:
Leaf Adaptation:
digestive enzymes
secretions (which trap insects) and
b. sundew: leaves have sticky
Leaf Adaptation:
release digestive enzymestrap the animals inside andare hinged; they fold up & and
c. Venus Flytrap: leaf blades