In which context are large number of air bubbles released in proves that release of oxygen and phtosynthesis happens ?
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Solution
Aim : To prove that oxygen is produced during photosynthesis by Hydrilla funnel experiment. Apparatus: Beaker with water , test tube , funnel, hydrilla plant, glowing splinter. <br> Procedure: <br> 1) Arrange the apparatus as shown in the figure. <br> 2) Place some water plant like Hydrilla in a short stemmed funnel and keep it in a beaker. <br> 3) Then pour the water in the beaker. <br> 4) Invert a test - tube full of water over the stem of the funnel. <br> 5) Ensure that the level of water in the beaker is above the level of stem of the inverted funnel. <br> 6) Place the apparatus in the sunlight for at least 8 -9 hours. <br> Observation : <br> 1) After sometime it is observed that gas bubbles coming from the hydrilla plant. These bubbles are collected at the end of the test tube pushing the water into the beaker. <br> 2) After sufficient gas is collected, test - tube is taken out of the beaker carefully by closing it with thumb. <br> Test : Test the gas in the test - tube by inserting a glowing incense stick which would burst into flames. This shows the presence of oxygen : <br> Result : This shows that oxygen is produced during photosynthesis. <br> Precautions : <br> 1) Funnel should be smaller than the beaker. <br> 2) Care should be taken while removing test tube from the stem of funnel.