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The Leaves


Functions:
1
...
Respiration CHO + O2 (from atmosphere through stomata or
lenticel) -> CO2

Addition of oxygen

Young stem (green)
o
Photosynthesis & respiration can occur because
chlorophyll in chloroplast (inside stomata) is present

Old stem (bark)
o
Lenticels are present (note: leaves don’t have lenticels)

Periderm (note: found only in stem)
o
Lenticels facilitate gas exchange but photosynthesis doesn’t occur because stem is not green anymore, so
chlorophyll is no longer present
o
The outer suberized layer that protects underlying tissues
o
Tissues consisting the periderm: (review)

Phellogen (cork cambium)

Phellem (cork)

Phelloderm

Photosynthesis can occur in
o
Leaves
o
Young stem

Lenticels
o
Only contain oxygen because there are no chloroplasts present, they disintegrated
o
Only carbon dioxide enters

Respiration is a two way process:
a) Inhalation
b) Exhalation
o
Carbonic acid is acidic
3
...

o
Irregular or zygomorphic – flower cannot be cut into two symmetrical halves along any plane
...
E
...
magnolia, mustard, and brinjal
o
Perigynous – ovary is partially sunken in the thalamus
...
Plumule
2
...
Hypocotyl
4
...
Hilum
2
...
Microphyte

Notes by: Alexandra Breatriz Silva, Aubrey Olaran and Mary Divine Alegado



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