Page 26 - EM BIOLOGY NOTES 10TH CLASS PSR DIGITAL BOOKS

PROCEDURE :
1. Take a potted plant.
2. Keep it into the darkroom for a week days.
(due to this, leaves are free from starch)
3. Select a leaf and cover it with a piece of black chart as shown in the diagram.
(black chart stops sunlight. So, that part of leaf does not exposed to sunlight)
4. Keep the entire set up in sunlight for 4-5 hours.
5. Detach the leaf from the plant.
6. Remove the chart piece and test the leaf by using iodine solution.
OBSERVATION :
Entire leaf turns blue-black colour except the part covered by the black chart.
INFERENCE :
This experiment proves that light is essential for photosynthesis.
PRECAUTIONS :
We should fix the black chart on the leaf tightly by using clips.

4. O IS LIBERATED DURING PHOTOSYNTHESIS
2
AIM :
To prove that O is liberated during photosynthesis.
2
APPARATUS :
1. Beaker 2. Test tube 3. Hydrilla plants
4. Glass funnel 5. Water 6. Glowing splinter
DIAGRAM :

PROCEDURE :
1. Take a beaker. 2. Fill with water.
3. Take a funnel. 4. Insert hydrilla plants in it.
5. Keep funnel into the beaker as shown in the diagram.
6. Take a test tube filled with water.7. Invert it over the funnel.
8. Keep the entire setup in sunlight.
OBSERVATION :
1. Small gas bubbles are come out from the hydrilla plants.
2. These gas bubbles collected at the end of the test tube.
3. Then test the gas with splinter.
4. The splinter glows and burns vigorously.
INFERENCE :
This experiment proves that O is liberated during photosynthesis.
2
PRECAUTIONS :
1. We should use submerged aquatic plants only.
2. Carefully invert and remove the test tube without entering air.

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