Page 25 - EM BIOLOGY NOTES 10TH CLASS PSR DIGITAL BOOKS

2. CO IS ESSENTIAL FOR PHOTOSYNTHESIS
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AIM : To prove that CO is essential for photosynthesis.
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APPARATUS :
1. Potted plant 2. Wide mouthed transparent bottle 3. KOH solution
4. Split cork 5. Iodine solution 6. Grease

DIAGRAM :

PROCEDURE :
1. Take a potted plant with long and narrow leaves.
2. Keep it into dark room for a week days. (due to this, leaves are free from starch)
3. Take a glass bottle. 4. Take 5-6 ml of KOH solution into the bottle.
(it absorbs the CO which is present in the bottle)
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5. Insert half of the leaf into the bottle.
6. Close the bottle with split cork and grease.
(it prevents the entering of CO into the bottle)
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7. Keep the entire setup in sunlight for 4-5 hours.
8. Detach the leaf from the plant. 9. Test the leaf by iodine solution.
OBSERVATION :
1. Part of the leaf outside the bottle turns into blue-black colour.
2. Part of the leaf inside the bottle does not turns blue-black colour.
INFERENCE : This experiment proves that CO is essential for photosynthesis.
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PRECAUTIONS : 1. Before inserting the leaf we should take KOH solution into the bottle.
2. We should close the bottle without leaving any gap.
3. LIGHT IS ESSENTIAL FOR PHOTOSYNTHESIS
AIM : To prove that light is essential for photosynthesis.
APPARATUS :
1. potted plant 3. Piece of black chart
2. Iodine solution 4. Clips
DIAGRAM :

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