1. Photosynthesis Using light E to produce food Autotrophs Producers
Food for
entire biosphere

2. Where in plants does photosynthesis occur?

3. another redox reaction…
Water is split apart
Lose e- or oxidized, leaving O2
CO2 is reduced to sugar
Gain e-
Opposite of cellular respiration?

4. Photosynthesis occurs in two stages
Light Reactions
Convert light E to chemical E and O2 waste
Thylakoid membranes
Cellular respiration
NADP+ is reduced to NADPH as e- carrier
Calvin Cycle

5. Stage 2 – Calvin Cycle
In stroma
Builds sugars
from CO2 and E
converted in Stage 1
NADPH provides
the e- to reduce CO2
ATP provides the E to drive the Calvin cycle

6. What is solar or light energy??

7. Pigments Light absorbing molecules In thylakoid membranes
Absorb wavelengths of light (some is reflected or transmitted)
Chlorophyll a
blue-violet & red
Chlorophyll b
blue & orange
Carotenoids
accessory
protect from excess
Xanthophylls

8. Filters, greenhouses, & global warming?
How do filters work?
What color filter is best suited for growing green plants?
What are the effects of varying levels of CO2?
How does a greenhouse affect plant growth?
What is the greenhouse effect?

9. Measure photosynthetic rate by CO2 assimilation
difference in CO2 input to CO2 output
Manipulate light and CO2
Measure surface area
Set parameters
Collect data
Analyze…

11. white
blue
red
green

12. How does a greenhouse affect plant growth?
When its too cold outside
Light passes inside
Reflective heat is trapped inside

13. What is the greenhouse effect?
Solar radiation passes in through atmosphere
Ozone filters out
most of UV
Sunlight passes inside
Reflective heat is
trapped inside by
atmospheric gases
Good thing; keeps Earth warm

14. Global Warming CO2 production and release to the atmosphere increases?
Burning more fossil fuels
Carbon based (coal, oil, gasoline)
Widespread deforestation
Less plants to consume or recycle CO2
Thus… temperature increases
Melting polar ice
Rising sea level
Extreme weather patterns

15. “Who speaks for the trees?”