Activity : Experimental Investigation - To Show that rate of photosynthesis is affected by light.

Activity : Experimental Investigation - To Show that rate of photosynthesis is affected by light.

1. Fill a beaker 3 quarters with water. Put some Hydrilla plants in it. 

2. Cover the plants with a glass funnel.

3. Carefully invert a test tube full of water over the stem of the funnel.

4. Keep the arrangement in sunlight. You will find bubbles of a gas escaping from the leaves of the plant.

5. Keep the plant away from sunlight now.

6. You will observe that the number of bubbles have decreased in the shady place. 

Activity : Experimental Investigation - To show that light is necessary for photosynthesis

Activity : Experimental Investigation - To show that light is necessary for photosynthesis

1. Take a potted plant and destarch its leaves by keeping it in dark for 2 days.

2. Take a black paper and cut a simple "L" shape in it by using a stencil.

3. Cover one leaf with this paper.

4. Leave the set up in sunlight for 4 - 6 hours.

5. Detach the leaf and test it for presence of starch.

6. You will observe that only the part of the leaf that could get sunlight through the cut out design as well as the other exposed parts of the leaf turn blue - black showing the presence of starch.