1. Photosynthesis 3

2. Photosynthesis
Photosynthesis is the process that produces food in plants in the form of glucose.
Word equation
Sunlight
Carbon dioxide + Water Glucose + Oxygen
Chlorophyll
Symbol equation
Sunlight
Chlorophyll
6CO2 + 6H2O C6H12O6 + 6O2

3. Section through a leaf Cuticle Epidermis Palisade layer Vein
Spongy layer
cells
Air space
Stomata
Guard cell
Lower Epidermis

4. Leaf Design for Photosynthesis
Leaves are thin and flat to catch sunlight.
Palisade cells, rich in chloroplasts, are found at the top of the leaf.
Guard cells control movement of gases in and out of leaf.
Leaves have veins to bring in water.

5. Testing for Starch Wash in Water Boil for 1 Minute
Warm in Methylated Spirits
Test for Starch

6. Starch Test Stage 1 - Boil to remove waxy cuticle
Stage 2 - Dissolve Chlorophyll in Ethanol
Stage 3 - Wash in water to soften
Stage 4 - Test with Iodine for Starch

7. Which is the correct result?

8. Which is the correct result?

9. Factors Affecting Photosynthesis
Carbon Dioxide concentration
Light intensity
Color of light
Temperature
Less Carbon Dioxide means less glucose can be made.
More light means more energy
Plants mainly use blue and red light.
Warmth increases the rate that enzymes work, however, high temperature denatures enzymes. Low temperatures slow reactions.

10. Colors of Light Used By Plants
% Absorption
Wave Length

11. Products of Photosynthesis and how they are used
N Frost
Products of Photosynthesis and how they are used
Glucose is:
converted into starch for storage
used for respiration
used to make cellulose for support
converted to protein to make cells
converted into sucrose.
Oxygen is:
used by plants for respiration.
Glucose & Oxygen