Photosynthesis

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  • The rate of photosynthesis
    • The temperature has to be just right
      • Usually if the temperature is the limiting factor it's because it's too low
        • This is because the enzymes needed for photosynthesis work more slowly at low temperature
      • But if the plant gets too hot, photosynthesis won't happen at all
      • This is because the enzymes are damaged if the temperature's too high (over 45 c )
    • How plants use glucose
      • MAKING PROTEINS
        • Plants absorb nitrate ions from soil
        • Glucose is joined with nitrate ions to make amino acids
        • The amino acids are then made into proteins
      • MAKING CELL WALLS
        • Glucose is made into cellulose
        • Cellulose is used to make strong cell walls
      • FOR RESPIRATION
        • Plants make glucose in their leaves
        • They then use some of the glucose for respiration
      • STORED IN SEEDS
        • Glucose is turned into fats and oils for storing in seeds. e.g. we get margarine from sunflower seeds. Seeds also store starch
      • STORED IN STARCH
        • Glucose is turned into starch and stored in roots, stems and leaves
        • Starch is insoluble- it doesn't dissolve. This makes starch much better for storing than glucose
  • How plants use glucose
    • MAKING PROTEINS
      • Plants absorb nitrate ions from soil
      • Glucose is joined with nitrate ions to make amino acids
      • The amino acids are then made into proteins
    • MAKING CELL WALLS
      • Glucose is made into cellulose
      • Cellulose is used to make strong cell walls
    • FOR RESPIRATION
      • Plants make glucose in their leaves
      • They then use some of the glucose for respiration
    • STORED IN SEEDS
      • Glucose is turned into fats and oils for storing in seeds. e.g. we get margarine from sunflower seeds. Seeds also store starch
    • STORED IN STARCH
      • Glucose is turned into starch and stored in roots, stems and leaves
      • Starch is insoluble- it doesn't dissolve. This makes starch much better for storing than glucose

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