1. The Leaf and Photosynthesis

2. Introduction
The leaf is a collection of tissues working together to carry out photosynthesis.
Photo synthesis
(light) (putting together)
[Putting together with light]

3. Introduction The purpose of photosynthesis is to create energy
Water + Carbon Dioxide > Glucose + Oxygen
chlorophyll +light
6 H2O (l) + 6 CO2 (g) > C6H12O6 (aq) + 6O2 (g)

4. Plant cells have organelles called chloroplasts.
chloroplasts contain a green pigment chlorophyll
cells containing chloroplasts are found in the ground tissue
light energy is absorbed by chlorophyll and turned into chemical energy (food for the plant)

5. Chloroplasts
Chloroplasts are suspended in cytoplasm and move inside cells. Cytoplasm behaves like a thick liquid and its movement is termed cytoplasmic streaming.

6. Chloroplasts
Chlorophyll is not the only pigment to capture light energy
Accessory pigments help protect the plant and capture the most energy possible

7. Chloroplasts

8. Gas Production in Plants
Two main reactions that take place in plants and produce gases as products.
Photosynthesis occurs in chloroplasts
Occurs in the light
Produces O2 and glucose
Cellular respiration occurs in the cytoplasm and mitochondria
Does not need light (except needs products from photosynthesis)
Reactions where bonds are broken and release energy
Glucose + oxygen  carbon dioxide + water + energy
C6H12O6 + 6O  CO H energy

9. Photorespiration
The two main reactions that take place in plants are so important to each other that we can call everything Photorespiration.

10. Experiments with Photosynthesis
What is an easy way to measure photosynthesis?
Watch for a product of photosynthesis – OXYGEN

11. Something to ponder….
The estimated amount of global energy from photosynthesis is 1.0 x 1021 joules.
That is joules
A hydrogen bomb is rated at 4.2 x 1015 joules
That is 238,095 hydrogen bombs!

12. Homework Read p.303 – 308 Do Check and Reflect
P.308 # 1,2,3,5,7,8 (DO NOT make the model)