biology-plants and photosynthesis

• word equation for photosynthesis

  carbo dioxide+water=glucose+oxygen+eergy(atp)
• calculation for light intensity


  light intestity is directly proportional to 1/distance2
• what can glucose be used for?


  Energy

  plant energy

  plant building material
• testing a leaf for starch


  1.boil the leaf for 30 seconds

  2.add the boiling ethanol in a water bath

  3.wash with water to rehydrate

  4.add the iodine solution from a dropping pipette

  5.turns blue/black
• varigated leaves


  -contain both green and white parts
• de-starch a plant


  -leave in dark for a few hours
• conditions needed for photosynthesis


  -lots of sun

  -warm tempreture

  -lots of water

  -chlrophyll must be present