PHOTOSYNTHESIS-TEST TUBE AND FUNNEL
that oxygen is evolved during photosynthesis.
tube, funnel, beaker, pond water and Hydrilla plant.
Take a few twigs of Hydrilla plant in a beaker
containing pond water.
Place an inverted funnel over the plant.
Invert a test tube filled with water over the stem
of the funnel.
Keep the apparatus in the sunlight for few hours.
hour, it is noted that water gets displaced down from the test tube.
photosynthesis, oxygen is evolved as a by-product. Gas bubbles liberated from
the Hydrilla plant reach the top of the test tube and it displaces the water
downwards. Take the test tube and keep the burning stick near the mouth of the
test tube. Increased flame will appear. Hence, it is proved that oxygen is
evolved during photosynthesis.