photosynthesis

• Explain the role of plants as producers for food

  • Plants carry out photosynthesis
  • which uses energy transferred by light
  • to produce glucose
  • which can be converted into other food substances
• Explain why photosynthesis is an endothermic reaction

  • Energy is taken in
  • Energy in the form of light is transferred to energy in the form of chemical (potential) energy in sugars
• word equation for photosynthesis

  carbon dioxide + water $\rightarrow$ glucose + oxygen
• where does the energy for photosynthesis come from

  sunlight
• what organ does most photosynthesis take place

  leaf
• what organelle does photosynthesis take place

  chloroplast
• which substance is responsible for absorbing light energy for photosynthesis

  chlorophyll
• how do plants get the carbon dioxide required for photosynthesis

  it diffuses from the air into their leaves, via stomata
• how do plants get the water required for photosynthesis

  it diffuses from the soil into the root hair cells, via osmosis
• three features of starch that make it a useful long-term storage molecule

  • it is insoluble in water
  • it is compact
  • it can be easily be broken down when needed
• is photosynthesis exothermic or endothermic

  it is endothermic as it requires energy from the sun
• what is the symbol equation for photosynthesis

  6CO2 + 6H2O ➔ C6H12O6 + 6O2
• 5 ways plants can use the glucose they produce

  • cellular respiration - break down the glucose to release energy
  • make cellulose - which is used to make strong cell walls
  • make starch - which is used to store glucose for a later time
  • make amino acids - which are used to make proteins
  • make lipids - these store energy as fats or oils, for later use