1. Do fish and plants breath?
Developing: Describe methods of detecting aerobic respiration.
Secure: Explain how gas exchange occurs in different organisms.
Exceeding: Analyse changes between inhaled air and exhaled air.
Entrance Activity
Swap question sheets from the previous lesson and attempt to answer your partners question.
Tool Box - Key words
Hydrogen carbonate indicator
Cobalt chloride paper
Limewater
Gills
Stomata

2. Do fish and plants breath? Do fish and plants need oxygen?
Discussion activity
Do fish and plants breath?
Do fish and plants need oxygen?

3. Teacher Demo
Lime Water
Student reading
Lime water (Calcium Hydroxide) is an indicator for carbon dioxide. If carbon dioxide is bubbled through lime water it turns to a cloudy/milky white,
Tube
Colour change
Carbon dioxide? A B

4. Hydrogen Carbonate Indicator
Teacher Demo
Hydrogen Carbonate Indicator
Student Reading
Hydrogen carbonate indicator is a pink solution. If carbon dioxide is added to the solution it decreases the pH and changes the solution yellow. Whereas, is carbon dioxide is removed it increases the pH and turns purple.

5. Teacher Demo
Cobalt chloride paper
Student Reading
Cobalt chloride paper is an indicator for water. When water is applied to cobalt chloride paper it changes from blue to pink. Try breathing onto a piece of cobalt chloride paper and observe the change.

6. Identifying Gases
Learning Activity
Attempt to complete the 8Cd learning sheet. Once complete move onto the extension activity, shown below.
Extension Activity
Produce a brief description of how to do the following tests:
Limewater
Colbolt chloride
Hydrogen carbonate indicator

7. Do fish and plants breath?
Developing: Describe methods of detecting aerobic respiration.
Secure: Explain how gas exchange occurs in different organisms.
Exceeding: Analyse changes between inhaled air and exhaled air.
Entrance Activity
Swap question sheets from the previous lesson and attempt to answer your partners question.
Tool Box - Key words
Hydrogen carbonate indicator
Cobalt chloride paper
Limewater
Gills
Stomata

8. Gas Exchanges in Plants
Teacher Explanation

9. Gas Exchanges in Plants
Teacher Explanation
Name part X.
If the plant is only doing respiration, which gases will move in and out of the plant?
If the plant is only doing photosynthesis, which gases will move in and out of the plant?

10. Do fish and plants breath?
Developing: Describe methods of detecting aerobic respiration.
Secure: Explain how gas exchange occurs in different organisms.
Exceeding: Analyse changes between inhaled air and exhaled air.
Entrance Activity
Swap question sheets from the previous lesson and attempt to answer your partners question.
Tool Box - Key words
Hydrogen carbonate indicator
Cobalt chloride paper
Limewater
Gills
Stomata

11. Learning Activity
Inhaled vs Exhaled
Inhaled air (%)
Exhaled air (%)
Nitrogen 78
Oxygen 21 16
Carbon dioxide
0.04 4
Water vapour
Variable
Increase in water
Temperature
Increase in temp
Write a conclusion to summarise the changes in the different gas levels shown above. Where possible, explain why this change has occurred using your scientific knowledge.

12. Do fish and plants breath?
Developing: Describe methods of detecting aerobic respiration.
Secure: Explain how gas exchange occurs in different organisms.
Exceeding: Analyse changes between inhaled air and exhaled air.
Entrance Activity
Swap question sheets from the previous lesson and attempt to answer your partners question.
Tool Box - Key words
Hydrogen carbonate indicator
Cobalt chloride paper
Limewater
Gills
Stomata

13. Plenary
Mini-Quiz