photosynthesis & limiting factors

• | photosynthesis

  • photosynthesis used ENERGY to change CARBON DIOXIDE & WATER into GLUCOSE & OXYGEN
  • endothermic
  • energy is transferred to chloroplasts from environment by LIGHT

  
• carbon dioxide + water > glucose + oxygen
• 6CO2 + 6H2O —> C6H12O6 + 6O2
• | how plants use glucose

  
  

  1. RESPIRATION: transfers energy from glucose, enabling plants to CONVERT th rest of glucose into other USEFUL substances
  2. MAKING CELLULOSE: glucose is converted into CELLULOSE for making strong PLANT CELL WALLS
  3. MAKE AMINO ACIDS: glucose + nitrate ions to make amino acids which are then made into PROTEINS
  4. STORED AS OILS OR FATS: glucose is turned into lipids to store in seeds
  5. STORED AS STARCH: glucose turned into STARCH, stored in roots, stem & leafs for when photosynthesis doesn’t occur_ starch is insoluble so it stores glucose better
• is photosynthesis endothermic or exothermic

  endothermic
• what is photosynthesis

  using energy to change carbon dioxide and water into glucose and oxygen
• where does photosynthesis take place in

  chlorplasts in green plant cells, containing CHLOROPHYLL that ABSORBS LIGHT
• how do plants store glucose as starch

  glucose is turned into starch & stored in ROOTS, stems & leaves
• when do plants use starch

  for when photosynthesis isnt happeningg, like in winter
• why is starch better for storing glucose

  because it is INSOLUBLE since cells with lots of glucose would draw lots of water & swell up
• | limiting factors for photosynthesis

  • rate of photosynthesis is affected by LIGHT INTENSITY, CO2 concentration, temperature
• | limiting factors for photosynthesis

  • any of the 3 factors can become the limiting factor- this means that it’s stopping photosynthesis from happening FASTER
• | limiting factors for photosynthesis

  which factor is limiting @ a particular time depends on environmental conditions:

  • at NIGHT = light
  • winter = temperature
  • if warm & bright enough = CO2
• | limiting factors for photosynthesis

  chlorophyll can also be a limiting factor of photosynthesis
• | limiting factors for photosynthesis

  amount of chrolophyll in a plant can be affected by DISEASE or environmental stress which can damage CHLOROPLASTS so rate of photosynthesis is REDUCED because they can’t absorb as much light
• name the products of photosynthesis

  glucose & oxygen
• what are the main limiting factors of photosynthesis

  light

  temperature

  CO2 concentration

  amount of chlorophyll