Photosynthesis
Learning Outcomes
- Explain how energy is absorbed
by pigments
- Explain the process of photosynthesis through:
- Electron transport chain
- Photolysis
- ATP synthesis
- Calvin Cycle
- Carbon Fixation
What do you Know?
Answer the following questions without your
books or cell phones or each other!
1. Write the formula for photosynthesis
2. Why is water used in photosynthesis?
3. Why are deciduous leaves green in the summer but
yellow in the fall?
4. What is carbon fixation?
5. How do plants get ATP for photosynthesis?
6. How are photosynthesis and cellular respiration
complementary?
Video
https://www.youtube.com/watch?v=joZ1EsA5_NY
Photosynthesis Web
In the middle of your page write
the word Photosynthesis.
Create a web of all the information you know
and all the information you can get from the
textbook branching off of it.
Photosynthesis Web
Chlorophyll b
Green pigment
2 kinds
Chlorophyll
Absorbs
photons
Chlorophyll a
Photosynthesis
Light
Light is a form of electromagnetic
radiation that travels through waves
Light is made up of small molecules called
photons
Light
Light
Our eyes perceive photons of
different wavelengths, or energies, as
different colours
Remember:
The chemical formula for
photosynthesis is as follows:
CO2 + H2O + energy → C6H12O6 + O2
Chlorophyll
This is the light-absorbing green
coloured pigment that begins the process of
photosynthesis
There are many forms of this pigment in plants
The most common are chlorophyll a and chlorophyll
b
Chlorophyll
Chlorophyll a - blue green
Chlorophyll b - yellow green
These chlorophylls absorb photons in be blueviolet and red regions of the spectrum which our
eyes see as green light
Chlorophyll
Chlorophyll
Chlorophyll a is the only pigment that
can transfer the energy from sunlight to the
reactions of photosynthesis
Chlorophyll b is an accessory pigment and
absorbs photons that chlorophyll a absorbs poorly
or not at all
Chloroplasts
Chloroplasts
Chloroplasts are membrane bound
organelles found in plant cells
http://www.learnalberta.ca/content/seb20p/index.
html
Chloroplasts
Lamella
Chloroplasts
Chlorophyll in plants lives in the
chloroplasts
Chloroplasts give plants their green appearance
They are the site of photosynthesis
Parts of Chloroplasts
Stroma: liquid material in the
chloroplast
Thylakoid: system of interconnected flattened
membrane sacs forming a separate compartment
within the stroma
Grana: stacks of thylakoids
Lamellae: groups of unstacked thylakoids between
grana
Quick Review
What pigments are present in green
leaves?