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Photosynthesis

Photosynthesis. Two main groups of living things:. Plants Animals In science we call them…. Autotrophs. Heterotrophs. How do autotrophs get their energy to make food? How do heterotrophs get their energy?. Sunlight. By consuming something else.

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Photosynthesis

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  1. Photosynthesis

  2. Two main groups of living things: • Plants • Animals • In science we call them…. Autotrophs Heterotrophs

  3. How do autotrophs get their energy to make food? • How do heterotrophs get their energy? Sunlight By consuming something else

  4. How do organisms obtain most of their energy? Carbohydrates (plant material)

  5. How do plants make carbohydrates? • Photosynthesis • Creates glucose molecules • Glucose molecules broken down in cells to basic unit of energy ATP

  6. What is Energy? • Ability to do work • Where does energy come from? • FoodGlucose molecules • C6H12O6 = glucose

  7. Living things use chemical energy stored in food • Energy is stored as  ATP Adenosine Triphosphate

  8. ATP powers cell activities like: • Active transport • Protein synthesis • Muscle contractions

  9. Energy is released when bonds are broken between phosphates – becomes ADP (Adenosine Diphosphate) • ADP can be recharged to ATP by adding a phosphate = stored energy

  10. ATP vs. ADP • ATP is like a fully charged battery • ADP is like a half charged battery

  11. Photosynthesis • Plants use energy from sunlight to convert water and CO2 into high-energy carbohydrates and oxygen

  12. Equation for photosynthesis light 6CO2 +6H2O C6H12O6 + 6O2 Carbon dioxide + water  sugars + oxygen

  13. Photosynthesis is divided into two parts: • Light Dependent Reaction (needs sun) • Light Independent Reaction OR Calvin cycle

  14. Why are plants green? Chlorophyll in chloroplasts What does chlorophyll do? Traps energy from sunlight

  15. H2O CO2 Light 2ndreaction: no light required 1st reaction: light required C6H12O6 Oxygen

  16. Quick Quiz • What is the name of the main energy-storing compound in living organisms? • What are the two reactions of photosynthesis? ATP Light Dependent and Light Independent (or Calvin Cycle)

  17. Light Energy and Water • What are the two things required in the first reaction? • What is required for the second reaction? • What are the products of photosynthesis? Carbon dioxide Oxygen and Glucose

  18. Reason: The beakers closer to the light should produce more oxygen bubbles because light is required for the 1st part of photosynthesis in which water is split and oxygen is released

  19. The picture shows the results of a demonstration using the simple water plant Elodea. When the setup was placed in strong light, a space gradually appeared above the water in the graduated cylinder containing the plant. The gas in the space above the water was mostly - Reason: Oxygen is produced during the first stage of photosynthesis; carbon dioxide is USED during the second stage; hydrogen from the water is USED in the second stage to form carbohydrates; nitrogen is not produced/used in photosynthesis

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