1. Energy All chemical processes in the cell require energy. Both plant and animal cells obtain energy from “ energy-rich” compounds, such as glucose (sugar) The difference is how plants and animals obtain these compounds.

2. How do plant and animal cells obtain energy rich compounds? Plants? Use light to make their own sugars (Photosynthesis) Animals? Need to get energy compounds from their diet.

3. Photosynthesis Plants make their own food. This process is called photosynthesis. Photo = Light Synthesis = To make Photosynthesis = Make sugar

4. Where does photosynthesis occur? Photosynthesis occurs in the leaves of a plant. Can we be more specific?

5. Chloroplasts Photosynthesis occurs in chloroplasts Chloroplasts contain a special substance called chlorophyll, which makes leaves green Chlorophyll captures light  chemical energy.

6. The Reaction carbon dioxide + water  glucose + oxygen Balanced Equation: 6C0 2 + 6H 2 O  C 6 H 12 O 6 + 6O 2 light energy chlorophyll light energy chlorophyll

7. Photosynthesis

8. Why do plants need glucose? Glucose is the food for the plant. It gives the plant energy to grow.

9. Glucose Some is used right away for the cell’s life functions. Other glucose molecules are stored together to form starch. Starch and sugar taste different. Think about fresh corn vs. corn that has been picked and let to sit for a few days.

10. So you have sugar now what? Recall: Plants get their glucose from photosynthesis, animals get glucose from their diets. How do plants and animals then extract the energy from these glucose molecules? Both types of cells use: Cellular Respiration

11. Cellular Respiration Recall: plant and animals both have mitochondria. Most reactions of cellular respiration occur in the mitochondria.

12. Mitochondria The “power-house” of the cell. glucose (sugar) + oxygen  carbon dioxide + water + energy C 6 H 12 O 6 + 6O 2  6 CO 2 + 6H 2 0 + energy

13. Mitochondria

14. The Connection Look at the equations for photosynthesis and cellular respiration. Any relationships between the two? energy + 6C0 2 + 6H 2 O  C 6 H 12 O 6 + 6O 2 C 6 H 12 O 6 + 6O 2  6 CO 2 + 6H 2 0 + energy

15. The products of photosynthesis (C 6 H 12 O 6 + 6O 2 ) are the reactants for cellular respiration The products of cellular respiration (6 CO 2 + 6H 2 0 ) are the reactants for photosynthesis Thus we are all connected.

16. The Connection

17. Common Misconception Trees Need Carbon Dioxide Yes!! Humans need Oxygen Yes!! We give one to the otherYes!! Cutting trees would mean less oxygen for us No!! There is a surplus of oxygen for us to breathe, however if we cut down all the trees then what happens? Increase in the amount of carbon dioxide. This is why we need trees; they are the lungs of the planet.