Question

photosynthesis_test tube and funnel experiment​

Answer 1

Answer:

A beaker is filled with water and twigs of Hydrilla are inserted in the funnel so that the cut ends are in the tube of the funnel and the funnel is put in the water. Then a test tube full of water is inverted over the inverted funnel. Air bubbles from the plant collect at the tip of the tube.

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Answer 2

Answer:

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Explanation:

PHOTOSYNTHESIS-TEST TUBE AND FUNNEL EXPERIMENT(DEMONSTRATION)

 

Aim:

To prove that oxygen is evolved during photosynthesis.

 

Materials required:

Test tube, funnel, beaker, pond water and Hydrilla plant.

 

Procedure:

1.              Take a few twigs of Hydrilla plant in a beaker containing pond water.

2.              Place an inverted funnel over the plant.

3.              Invert a test tube filled with water over the stem of the funnel.

4.              Keep the apparatus in the sunlight for few hours.

 

Observation:

After one hour, it is noted that water gets displaced down from the test tube.

Inference

During 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.