2.22 investigating photosynthesis

evolution of oxygen from a water plant
Equipment:
-Water plant
-a container filled with water (to collect the gas)
-a test tube filled with water
-glass funnel


Place the funnel in the container (so it is fully submerged)
place the end of the test tube over the end of the funnel
--take care NOT to introduce any gasses
Lift vertically (so the tube is in the air, the funnel head is still in the water)
Put the plant under the funnel (take care to ,when in the water, shake off any gas bubbles)
as the plant photosynthesises, oxygen will bubble up through the test tube and displace the water and eventually fill the tube with oxygen
this can later be tested with a glowing splint to verify that the gas in the tube is oxygen


the production of starch


the requirements of
light, carbon dioxide and chlorophyll