Photosynthesis, Plants & there
Impact on the Energy Available
in our Ecosystems
Chapter 10, Parts of 53 & 54
Diversity of life: What organisms use
photosynthesis?
Redox
• Label oxidation, reduction, oxidizing agent,
reducing agent
Basic Experiments
• Priestly
• Ingenhousz
• How do these show
the interrelated nature
of photosynthesis and
respiration?
Where is
this all
going on?
Fig 10.4
A two-part reaction divided…
photophosphorylation & carbon
fixation
Fill in the basics using 10A and
10B
Question to think about…
• Where does the
oxygen come from in
photosynthesis
• How could this be
determined for sure?
– Van Neil--H2S bacteria
– O-18
Review of electromagnetic spectrum
• Activity 10C
• Understand absorption
spectrum vs. action
• How does the
Englemann
experiment show the
absorption of
Chlorophyll?
Activity 10C
• Light Reactions
– Label the organization within the
thylakoid membrane
Purpose of a photosystem
• Direct energy to a
reaction center.
• Allows the release of
an_______________
by ______________.
Review of the 2 photosystems
More ATP is needed than
NADPH
• Noncyclic Flow
• Cyclic Flow
Chemiosmosis: how structure
meets function
Comparison to Respiration
• How are the light reactions similar to the
electron transport chain in cellular
respiration?
• How are they different?
• What is the purpose of the ATP produced
during photosynthesis?
• Do plants need cellular respiration?
Calvin Cycle—Sugar Shack!
• Watch Campbell’s Activity—10E
Calvin Cycle
Comparisons to Cellular
Respiration
• How is the Calvin Cycle similar to the
Kreb’s cycle?
• How is it different?
• What molecule in cellular respiration is
equivalent to G3P?
• How would you explain to a 9th grader that
photosynthesis and respiration are related?
Chloroplast vs.
Mitochondria
• How are these
organelles
structurally similar?
Functionally
similar?
Evolutionarily
similar? Different?
Photorespiration
• Photorespiration: oxygen
added to the Calvin Cycle
instead of carbon dioxide
• Activity 10E and pages 191193, adaptations to deal with
water loss/photorespiration
• Be able to discuss physical
differences, differences in
the molecular processes, and
examples of C3, C4 and
CAM plants
Review of Food Web and Transfer
of Energy
• Heterotroph
– Primary Consumer
– Secondary
Consumer
– Tertiary consumer
• Autotroph
– Producer
• Decomposer
Productivity—What can the producers
of an ecosystem support?
10% Rule
How much a given ecosystem can
support depends on the producers
Why less at the top?
• Why are there
Even less carnivores?