1. Lesson Starter How do vegetarians get the nutrients that they require?
Describe the test we carried out for carbon dioxide?
What name is given to animals that eat:
a) Only plants b) only meat c) plants and meat

2. The importance of photosynthesis

3. Demo Hold a lit splint in the air Light a floating candle
Repeat but put gas jar over the burning candle
Hold a lit splint in the jar

4. Complete on page 18
__________ gas is needed for burning to get the energy out of the fuels like coal, oil and gas. Oxygen is also needed to get _____ out of the ______ we eat. These experiments show that the atmosphere contains roughly ____% oxygen gas

5. Respiration We make carbon dioxide in our cells during RESPIRATION
Respiration uses oxygen to release the energy that is trapped in food.
Carbon dioxide and water is produced as a product of respiration,
All living things carry out this process

6. Photosynthesis uses carbon dioxide gas to make food and release oxygen
Glucose + O2
CO2 + H2O
Light + chlorophyll
Respiration uses oxygen to get energy from food or fuel and releases carbon dioxide gas.
CO2 + H2O
Glucose + O2
Energy +

7. Respiration and photosynthesis are connected .
They are both needed to keep the balance of gases in the atmosphere.

8. The balance of gases in the atmosphere is changing.

9. In your groups; think of any human activity that could be causing the change in gas balance

10. Human activity Carbon emissions from vehicle exhausts Air transport
Carbon emissions from factories
Deforestation (cutting down forests)

11. Before you go..
Write down as many ways you can think of that we can help maintain the gas balance in the atmosphere