1. B2b Topic 3: Energy Flow Lesson Objectives: Describe the movement of carbon in the carbon cycle Produce a poster of the carbon cycle Photosynthesis and what affects the rate The carbon cycle Minerals and plants The nitrogen cycle Life on mars Climate change Food production

5. AQA Science © Nelson Thornes Ltd 2006 5 A 4000 year old corpse preserved in ice. Why hasn’t it decomposed?

6. Why is carbon important? Carbon is the main constituent of all living cells (biochemistry, organic chemistry) Carbon can form long chained-molecules which are the basis for fats, carbohydrates, nucleic acids (DNA and RNA) and proteins. Component of fuel (coal and gas) Use in nanotubes for computers

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10. Respiration, burning and decay Excrement and death Decay (micro- organisms and bacteria) Respiration

11. The Carbon Cycle Plants take in CO 2 because they need carbon and oxygen to use in Through photosynthesis plants make and other substances e.g. protein When animals eat plants they use some of the carbon containing compounds to grow Some carbon-containing compounds are used to release energy by photosynthesis glucose (carbohydrate) respiration.

12. Your task – drama time In groups of 3 – 4 you need to ‘act’ out the carbon cycle You can use mini white boards as props This will be peer marked – top groups get stickers and sweets One person to be nominated the narrator

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14. The carbon cycle True or false?

15. AQA Science © Nelson Thornes Ltd 2006 15 Green plants use carbon dioxide in photosynthesis. True

16. AQA Science © Nelson Thornes Ltd 2006 16 Combustion removes carbon from the atmosphere False – combustion releases carbon dioxide gas

17. AQA Science © Nelson Thornes Ltd 2006 17 The largest store of carbon is the atmosphere False – more is found in marine organisms and limestone rock deposits

18. AQA Science © Nelson Thornes Ltd 2006 18 Respiration adds carbon dioxide to the atmosphere True

19. AQA Science © Nelson Thornes Ltd 2006 19 Respiration only occurs in animals False – both animals and plants respire

20. Decomposers remove carbon dioxide from the atmosphere False – they respire and release carbon dioxide

21. AQA Science © Nelson Thornes Ltd 2006 21 Fossil fuels represent a huge (but decreasing) store of carbon True

22. AQA Science © Nelson Thornes Ltd 2006 22 Increasing carbon dioxide may cause global cooling False – scientists think it will cause global warming

23. AQA Science © Nelson Thornes Ltd 2006 23 Energy is transferred from plants to animals to decomposers True

24. AQA Science © Nelson Thornes Ltd 2006 24 Respiration releases energy to the environment in the form of heat True

25. Key word bingo respiration photosynthesis decay burning potato combustion deforestation dissolved Light intensity trees chloroplasts glucose xylem leaf