Nutrition

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  • The Secret Life of Plants - Nutrition
    • PHOTOSYNTHESIS produces GLUCOSE using LIGHT
      • PHOTOSYNTHESIS uses ENERGY to change CARBON DIOPXIDE and WATER into GLUCOSE and OXYGEN
        • Takes place in - CHLOROPLASTS in GREEN PLANT CELLS - contain PIGMENTS like CHLOROPHYLL that ABSORB LIGHT
          • Energy is TRANSFERRED to the CHLOROPLASTS from the environment by LIGHT
            • Photosynthesis is ENDOTHERMIC - ENERGY is TRANSFERRED from the ENVIRONMENT in the process.
              • Word equation - Carbon Dioxide + Water -(light)-> Glucose + Oxygen
              • Symbol Equation (Numbers before are big and others are small (atoms)) 6CO2 + 6H2O -(LIGHT)-> C6H12O6 + 6O2
    • PLANTS USE GLUCOSE IN 5 main ways
      • RESPIRATION
      • MAKING CELLULOSE - makes PLANT CELL WALLS
      • MAKING AMINO ACIDS - Combines with NITRATE IONS, which is then made into PROTEINS
      • STORED AS OILS OR FATS - Turned into LIPIDS for storage in SEEDS.
      • STORED AS STARCH - For when photosynthesis isn't happening, a cell with lots of glucose would SWELL UP as it would draw in lots of water
    • LIMITING FACTORS affect the RATE OF PHOTOSYNTHESIS
      • The RATE OF PHOTOSYNTHESIS is affected by intensity of LIGHT, concentration of CARBON DIOXIDE and TEMPERATURE.
        • Any of these can become the LIMITING FACTOR-just means they're stopping photosynthesis from happening any FASTER.
          • Factors have a COMBINED EFFECT, which one is limiting at a particular time depends on the ENVIRONMENTAL CONDITIONS
            • Light - Limiting at NIGHT
            • Temperature - Often in WINTER
            • Carbon Dioxide - if warm and bright enough the amount of CARBON DIOXIDE.
      • CHLOROPHYLL can also be a LIMITING FACTOR

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