1. Photosynthesis

2. What is photosynthesis?
Where does it happen?
What do you know about it already?
Why is it useful?

3. Looking at the underside of a leaf
Look at the underside of a leaf
Capture a photograph
Stick the photograph in your book – label the following
What are the parts for?
epidermis
leaf
guard cell
stomata
(singular stoma)
Video link

4. Structure of a leaf

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

6. How do we know photosynthesis has happened?
Starch testing Plants turn glucose (a monomer) into starch (a polymer)
We pick a leaf
We fix the leaf
We remove the chlorophyll
We soften the leaf
We add iodine
Black = starch
Brown = no starch
Ethanol is flammable

7. 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?

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