B4: Photosynthesis

B4: Photosynthesis

1. To make their own food plants take in...

   • Carbon Dioxide from the air through pores called Stomata
   • Water from the soil through root hairs

2. Equations

   • carbon dioxide + water ---(sunlight)---> glucose + oxygen
   • 6CO2 + 6H2O ---(sunlight)---> C6H12O6 + 6O2

3. What does the plant make in photosynthesis?

   • Food - this is glucose. Used for respiration and stored
   • Oxygen - waste gas that is produced. Used for respiration and given off through the Stomata to surroundings

4. Storing Glucose

   • Three Advantages...
     • Starch can be converted back into glucose for respiration in plant cells
     • Starch is insoluble and so will not dissolve in water
     • Starch does not affect the water concentration inside the cells

5. Plants trap the Sun's energy in Chlorophyll which is in Chloroplasts in their cells

   • They use this energy to build up carbon dioxide and water into carbohydrates and oxygen