attaches blade of leaf to stem
has many leaflets (blades) coming of a single petiole
area which petiole of leaf grows off the stem
petiole's ability to twist to light
pattern of veins within leaf
main vein down center (if present)
pipeline for transporting sap/water
protects and covers. it is thin and covered by waxy cuticle (holds in water)
protection for woody plants
makes and stores food
thick cells and fiber
tube like cells in veins
move water/minerals upward from roots
move sap/food downward from leaves
apicable meristem at root/stem tips
growth in diameter
new xylem and phloem
covered by cuticle
pores on bottom; permits air to enter/leave; transpiration
excess water leaves
slow air flow /water loss
(upper) colums like cells; site of most photosynthesis-chlorophyll
(lower) large air spaces between cells; provides air for photosynthesis
cellulose and lignin
putting together of light; process whereby a green plant is able to capture radiant energy of sunlight and convert it into the chemical energy of food.
chlorophyll pigment in chloroplasts
process of photosynthesis
water enter chloroplast in leaf and is exposed to sunlight; suns energy split to the hydrogens off the water and releases oxygen as byproduct; water is converted into 2 other compounds in via stomata and air apaces of spongy layer; result is glucose/sugar
Why make glucose?
provide energy for plant cells to live and work; extra glucose is linked together into starch and stored in the plant which we eat
glucose is burned for energy
Why leaves fall?
shortened days in fall; lower temperature; abcission layer; enzymes release at base of petiole; cellulose weakened
Water and Wilting
influenced by temperature; water available in soil; windspeed across leaves (hairs present); air humidity
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