(1 ) Take a water plant like Hydria and put it in a beaker.
(2) Put a funnel inverted, over this plant. The stem of the funnel should be short.
(3) Fill a test tube with water and keep it inverted on the stem of the funnel. The level of water in the beaker should be above the upper end of the funnel.
(4) Keep this set-up in sunlight for a few hours.
Bubbles rise up slowly in the test tube and a gas is collected in the upper end of the test tube. On testing this gas with a lighted matchstick it is found to glow.
The gas collected is oxygen hence oxygen is given out during photosynthesis
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