Design an experiment to demonstrate that carbon dioxide is essential for photosynthesis. Write the…
Design an experiment to demonstrate that carbon dioxide is essential for photosynthesis. Write the observation and conclusion of the experiment.
Solution
(a)
Take two healthy potted plants, A and B of nearly the same size.
Keep them in darkness for three days. (Destarch the plant)
Place a watch glass containing potassium hydroxide by the side of potted plant A but not in potted plant B.
Cover both the plants with separate bell jars and seal the bottom of the jars with Vaseline.
Keep both the plants in sunlight for two hours.
Pluck one leaf each from both the plants and test for the presence of starch with iodine solution.
Observation: The leaf of the potted plant A with KOH did not turn blue-black. The leaf of the potted plant B turns blue.
Conclusion: KOH absorbs CO2 so photosynthesis did not occur in potted plant A.
