Photosynthesis uses light energy to produce complex organic molecules through a process of converting carbon dioxide and water. Autotrophs like plants carry out photosynthesis, while heterotrophs rely on ingesting these organic molecules for energy through respiration. Both plant and animal respiration depend on the products of photosynthesis, as it provides the basic energy-carrying molecules that all living things rely on.

1. Photosynthesis
(a) define the terms autotroph and heterotroph;
(b) state that light energy is used during photosynthesis to
produce complex organic molecules;
(c) explain how respiration in plants and animals depends
upon the products of photosynthesis;

4. (a) define the terms autotroph and
heterotroph;
• https://www.youtube.com/watch?v=HxDcOxX
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5. (a) define the terms autotroph and
heterotroph;
• Autotrophs – are organisms that use light
energy or chemical energy and inorganic
molecules (carbon dioxide and water) to
synthesise complex organic molecules
• Heterotrophs are organisms that ingest and
digest complex organic molecules, releasing
the chemical potential energy stored in them

6. (b) state that light energy is used during
photosynthesis to produce complex organic
molecules;

7. Extracting Chlorophyll
1. Add 7 spinach leaves to your pestle and mortar
2. Pour 10 ml of ethanol over the leaves and grind until
there are no lumps
3. Filter the liquid into a test tube
4. What colour is the liquid you have collected?
5. Shine a torch onto it, what colour is it now?
Can you explain your results?
Hint: think about what makes plants look green

8. (c) explain how respiration in plants
and animals depends upon the
products of photosynthesis
http://bcs.whfreeman.com/thelifewire/content/chp08/080200
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Page 59 Q1 and Stretch and Challenge
Question A

9. Elysia viridis