Download Photosynthesis lab

Biology 101 Lab 4
Photosynthesis
Announcements
• Quiz #2– Questions on population
growth thrown out (11/
• Midterm Exam next Wed
• Study sessions?
• Mistake ecosystem lecture– 10% rule
edited on posted slides!
1
Plant Anatomy: Vegetative Organs
Leaves:
Stem:
Photosynthesis
Gas exchange
Light absorption
Support
Transport
Storage
Roots:
Anchorage
Storage
Transport
Absorption
leaf blade
Form = Function
Leaf Vein
(one vascular
bundle)
leaf vein
cuticle
Upper
Epidermis
Palisade
Mesophyll
stem
xylem
Spongy
Mesophyll
Water, dissolved
mineral ions from
roots and stems
move into leaf
vein (blue arrow)
Lower
Epidermis
50m
phloem
Photosynthetic
products (pink
arrow) enter
vein, will be
transported
throughout
plant body
cuticle-coated cell
of lower epidermis
one stoma (opening
across epidermia)
Oxygen and
water vapor
diffuse out
of leaf at
stomata.
Carbon
dioxide in
outside air
enters leaf at
stomata.
Fig. 29-14, p.501
2
Making Energy - Photosynthesis
• Chloroplasts contain the pigment chlorophyll.
• Chlorophyll a & b
Photosynthesis: The Components
?
?
What are the inputs?
?
What are the outputs?
?
?
3
Photosynthesis: The Components
6CO2 + 6H2O + Light energy  C6H12O6 + 6O2
What are the inputs?
- light
- water
- carbon dioxide
What are the outputs?
- glucose
- oxygen
Light is a wave of energy:
colors are different
wavelengths
4
Photosynthesis: Input - Light
The color you see
Intensity
Energy (wavelength)
absorbed
Photosynthesis: Light Absorption
Plants are green because…
• Reflect green light.
• Absorb red, blue
and purple light.
5
Photosynthesis: Light Absorption
Plant pigments absorb light….
Absorb red, blue
and purple light
Reflect green light
Photosynthesis: The Components
6CO2 + 6H2O + Light energy  C6H12O6 + 6O2
What are the inputs?
- light
- water
- carbon dioxide
What are the outputs?
- glucose
- oxygen
6
Guard Cells
Vascular plants: have stomata
7