Photosynthesis and diffusion (B4)

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  • Biology Unit B4
  • Photosynthesis
    • Biology Unit B4
    • The process
      • Takes place in chloroplasts
        • contain pigments like chlorophyll - that absorb light
    • Glucose Uses
    • Limiting Factors
      • Light provides the energy needed for photosynthesis
        • If light level is raised, photosynthesis rate increases
          • But only up to a certain point
        • Beyond that the CO2 or temperature become the limiting factors
  • Sun energy changes CO2 + H2O to glucose and oxygen
    • The process
      • Takes place in chloroplasts
        • contain pigments like chlorophyll - that absorb light
  • Oxygen gas
    • 1) Light energy splits water to make:
  • Glucose
    • 2) Carbon dioxide gas combines with the hydrogen ions to make:
  • Glucose Uses
  • 1) Respiration
    • Converted into cellulose for making cell walls
      • 2) Making cell walls
      • Can't dissolve in water and move away from storage areas
      • If temperature is too high, the plant's enzymes denature
        • Temperature increases rate
        • Usually if temperature is limiting factor it's too low
      • This happens at about 45 degrees
        • If temperature is too high, the plant's enzymes denature
          • Temperature increases rate
          • Usually if temperature is limiting factor it's too low
      • Particles flow through the membrane from where there's:
        • High concentration
        • To low concentration
        • Cell membranes hold the cell together BUT they let stuff in and out
          • Diffusion
            • Diffusion is the net movement of particles from an area of higher concentration to an area of lower concentration
          • Only very small molecules can diffuse through
            • Like simple sugars, water or ions

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