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science plant test

Terms

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epidermis
to protect
cuticle
waxy layer, prevents water loss
active xylem is?
sapwood
palisade layer
main site of photosynthesis, contain chloroplast, long tightly packed cells
spongy layer
loosely packed cells, storing excess gases, gas exchange, 2nd site of photosynthesis
root hairs
extensions of epidermis, inscrease H2O absorption
functions of stems
holds leaves to sun, holds up flower, transports nutrients and H2O, contains xylem and phloem, if green performs photosynthesis, store food
wood of stem is composed of what?
inactive xylem (heartwood)
cortex
stores excess sugar as starch
angiosperms
flowering plant, seeds are hidden, most dominant plantform on planet
raw materials
light, H2O, CO2, chloroplast
vascular cylinder
xylem and phloem
root cad
layer of dead cells, protects growing root
examples: tap root system
cacti, dandelions
what are the specialized organs?
roots, stems, leaves
stomata
opening
tracheophytes
contain vascular tissue, tall growing, specialized organs, found almost anywhere
products
O2, glucose
examples: fibrous root system
grasses, some trees
tap root system
one main root, digs deep to find H2O
functions of the leaf
photosynthesis, gas exchange
structure of a leaf
cuticle, epidermis, palisade layer, spongy layer, vein, stomata and guard cells
guard cell
regulate gas exchange
nutrients absorbed?
nitrogen, sulfer, phosphorus, magnesium
vascular bundle
vein
four families of gymnosperm
cycads, ginkgoes, conifers, ganetophytes
3 types of tracheophytes?
ferns, gymnosperms, angiosperms
apical meristem
found at tip of stem, site of mitosis
ferns
do not produce seeds, produce spores, found in moist environments, leaves called fronds
cortex
stores excess food
photosynthesis
conversion of light energy into chemical energy
gymnosperms
produce cones, seed inside cone, naked seed
naked seed
not hidden within a fruit
bark is?
dead phloem cells
phloem
carries glucose from leaves to roots
epidermis
protection, absorbs H2O
xylem
carries H2O from roots to leaves
functions of a root
anchor the plant, absorb nutrients, absorb water, retain soil
vien
transport
fibrous root system
many main roots, shallow root system,

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