requirement: CO2

• practical: why does plant need co2 (5)

  1. to show why co2 is needed for photosynthesis you will need: plant, source of light, sealed bell jar, soda lime
  2. place plant + soda lime inside sealed bell jar
  3. the soda lime will absorb the co2 inside bell jar
  4. leave plant for a while + come back to test for starch. you will notice it won't turn blue-black
  5. this indicates that no starch has been made in the leaf, therefore co2 is needed for photosynthesis
• test self (hint)

  1. apparutus list
  2. place plat+soda lime
  3. soda lime absorbs co2
  4. leave plant+test for starch
  5. this indicates...
• 1st step

  to show that co2 is needed for photosynthesis, you will need: a plant, source of light, sealed bell jar, soda lime
• 2nd step

  place plant and soda lime inside sealed bell jar
• 3rd step

  the soda lime will absorb all of co2 from inside bell jar
• 4th step

  leave plant in jar for a while+ then test leaf for starch. you will notice it wont turn blue-black
• 5th step


  this indicates that no starch has been made in leaf, meaning co2 is needed for photosynthesis
• how to ensure results are not affected

  ensure any variables eg: temp are controlled as they can affect results
• how many steps


  5