Transcript CHAPTER 10 “INTRO TO PLANTS” p. 259

Leaves - where photosynthesis
occurs.
Structure p. 252.
A) cuticle
B) upper
epidermis
C) palisade
layer
D) spongy
layer
E) lower
epidermis
A) Cuticle - keeps moisture
in.
B) Upper epidermis - for
protection.
C) Palisade layer - where
most of the chloroplasts
are.
- where the photosynthesis
occurs.
D) Spongy layer - full of air
spaces and more
chloroplasts.
E) Lower epidermis
Stomate - opening for water vapor,
CO2, and oxygen.
- they close
during hot
weather to
stop water
loss.
Guard cell - opens and closes the stomate.
- they ‘swell up’ with water to close.
Stomates and
Guard Cells.
USES OF PLANTS
1) Clothing
ex. cotton
flax into linen
(P. 259)
2) Medicines
ex. aspirin
(from tree bark)
3) Wood and paper
- mostly from
conifers.
4) Turpentine / resins/
dyes. (mostly from
conifers).
5) Food
(energy transfer)
Sun --- plants -animals
6) Creation of oxygen
- thru photosynthesis.
Plant Evolution
- the seed plants ‘pushed
out’ the ferns over 70
million years ago.
- seeds are more
survivable than
spores.
Gymnosperms are over
200 million years old.
Angiosperms are over
120 million years old.
- are today’s most
common form of plant
life.
ASSIGNMENT:
WORKSHEET
“PLANT STRUCTURE”