1. Limiting Factors

2. What happens during photosynthesis?
light energy
carbon dioxide
water
oxygen
glucose
chlorophyll
Why is this useful to all living organisms?

3. What is photosynthesis?
What happens in summer to the grass when it rains a lot? Why does this happen?
Some commercial growers pump extra CO2 into their greenhouses for crops like tomatoes. Why?

4. Limiting factors (1) Weak bicarbonate solution No bicarbonate solution
Oxygen collected
Bicarb solution
Pond weed
No bicarbonate solution
Weak bicarbonate solution
Strong bicarbonate solution
What is the bicarb for?
What variables are we controlling?

5. What is happening here?

6. Carbon dioxide concentration
Rate of photosynthesis increases with light to a point
We will reach a point when no matter how much carbon dioxide you add the rate of photosynthesis stays the same
Carbon dioxide concentration is no longer the limiting factor

7. Limiting factors (2) Light Dark What variables are we controlling?
Oxygen collected
Bicarb solution
Pond weed
Light
Dark
What variables are we controlling?
What did we find out?

8. What are we investigating in this experiment?

9. Light intensity Rate of photosynthesis increases with light to a point
We will reach a point when no matter how close the light is (the intensity of light) the rate of photosynthesis stays the same
Light intensity is no longer the limiting factor

10. What is happening here?

11. Temperature What do we know about rate of reaction and temperature?
Photosynthesis is controlled by enzymes. Enzymes are made of protein. What happens to proteins as they get hotter?
Modest increases in temperature will speed up a chemical reaction but above a certain temperature rates will start to fall