Photosynthesis

• Photosynthesis


  Is the process by which plants make their own food using light
• word equation


  Chlorophyll

  Carbon dioxide + water——————————--> glucose + oxygen

  Sunlight
• Photosynthesis chemical equation


  Chlorophyll

  6CO2 + 6H2O ————------> C6H12O6 + 6O2

  Sunlight
• How plants photosynthesise


  Take in Carbon dioxide from the water through thinly pores called stomata (stoma), taking in water from the soil by their roots, sunlight is absorbed by chloroplasts in the cells, chlorophyll allows carbon and water to combine to form glucose, the energy for this reaction come from sunlight trapped by the chlorophyll, oxygen is given off as a waste product.
• As a chemical process


  Involves a number of steps, and new substances are formed
• As a biological process


  Occurs in the chloroplasts of living cells where enzymes that are essential to the process are present, it occurs in living cells & involves a number of steps
• Carbon cycle


  The constant cycling of carbon atoms.
• Factors affecting photosynthesis


  light intensity, carbon dioxide concentration and temperature
• Lux


  Lux, as it increases so does the rate of photosynthesis, a light meter measures the intensity of light.
• carbon dioxide


  If carbon levels are high so is the rate of photosynthesis, this is due to an increase of gas available to use in photosynthesis.
• Temperature


  The temperature can kill enzymes if to high and if to low they can freeze the work rate of the enzymes will slow if the temp is low, if temp increases so will the rate of photosynthesis
• Plant yield


  How much a plant will produce for a grower eg the number & size of tomatoes. Plants are producers and the living organisms that eat are consumers.
• Growers add


  Carbon dioxide to increase plant yield to greenhouses added by burning gas in the greenhouse.
• Light adjustments


  Are made to increase the rate of photosynthesis eg croke park for the shaded areas.