Question

Experiment of JOSEPH PRIESTLY which proves air is essential for photosynthesis.

∴ BELL JAR EXPERIMENT... step by step explanation....

Answer 1

Answer:

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Explanation:

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Answer 2

Explanation:

Select a healthy potted plant and place it in the darkroom for two to three days to ensure leaves are free from starch.

In a wide-mouthed glass bottle add 10-15 ml of potassium hydroxide solution and split the cork vertically.

Now carefully insert half part of a leaf into a glass bottle through the split cork and the other half exposed to air.

Place the complete unit undisturbed in sunlight for about 3 – 4 hours.

After 4 hours detach the leaf from the plant and slowly remove it out from the bottle and test it with the starch solution.

We can observe that the half part leaf which was inside the glass bottle (KOH solution) did not show any colour change but the other half part exposed to surroundings turned its colour to dark brown indicating the presence of starch in it.

Conclusion: In this experiment, we can conclude that carbon dioxide is essential for photosynthesis. Both the portion of leaf received the same amount of water, chloroplasts, and sunlight but the half part which was inside the glass bottle did not receive carbon dioxide.

Experiments to prove carbon dioxide is essential for photosynthesis.

Later, many improvised experiments were conducted by scientists to analyze the essential components for photosynthesis. Joseph Priestley (1733-1804) was amongst the first to carry out these experiments.

Experiment by Joseph Priestley

In 1770, after a series of experiments, Joseph Priestley came to a conclusion regarding the essentiality of air for photosynthesis and also for the growth of plants.

Materials required: A bell jar, candle, rat, and a plant.