How can we demonstrate that chlorophyll is necessaryforphotosynthesis
Answers
Answer:
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Chlorophyll helps plants to prepare food and thats why it is necessary and if it wouldn't have been present then the plants would die...
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Answer:
Method:
1. Fill the beaker with the water and take an aquatic plant, such as Hydrilla, in the beaker.
2. Cut the bases of the plants, tie them with a thread and cover them with an inverted funnel in such a fashion that the cut ends of plants are towards the neck of the funnel (Fig. 37).
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3. Fill a test tube with the water and invert it on the upper end of the funnel.
4. Keep the whole apparatus in sunlight and observe for some time.
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Observations:
From the cut ends of the plant some bubbles are coming out continuously and they are collected at the top of the test tube by displacing the water. On testing this gas it is found that it is oxygen.
Results:
The liberated gas is oxygen and it is evolved due to the photolysis of water under the process of photosynthesis. The liberated gas comes in the intercellular spaces and ultimately evolves out through the stomata.
3. Experiment to compare the rate of photosynthesis under different conditions with the help of Wilmott’s bubbler:
ADVERTISEMENTS:
Requirements:
Wilmott’s bubbler, water, Hydrilla, vaseline, papers of red, blue and green colours, heater, sodium bicarbonate, thermometer, etc.
Method:
1. Fill a Wilmott’s bubbler with pond water.
2. Cut the bases of the Hydrilla plants, tie them with a thread and insert them in the narrow tube of the bubbler in such a fashion that their cut ends are towards the upper side as shown in the Fig. 38.

3. Add some definite quantity of sodium bicarbonate in the water and note the number of bubbles coming out in definite time.
4. Increase a definite quantity of sodium bicarbonate with definite interval and note the increase or decrease in the number of bubbles.
5. Again fix up the apparatus in the same way as discussed above. But instead of adding sodium bicarbonate, keep the whole apparatus in sunlight and shade with definite intervals and note the number of bubbles in a definite time.
6. Fix up the apparatus afresh and now cover the bubbler with red paper and note the number of bubbles in definite time. Take also the readings of bubbles covering the bubbler with green and blue coloured papers in a definite time. Again fix up the apparatus afresh and now instead of adding any substance or covering the bubbler with coloured papers, keep it near the electric heater. Note the readings in different temperatures.
Observations:
Arrange all readings of different conditions in the form of tables as follows: