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Question

A Hydrilla plant is kept in a beaker containing water. It is covered with an inverted glass funnel and a test tube full of water is placed over it .Care is taken about the water level so that no bubble enters the test tube. The whole experiment is put in sunlight. It is found that the level of water is coming down and a gas accumulates at the upper end of the test tube. The whole experiment is conducted in red, blue and green light alternatively. After sometime some amount of Sodium bicarbonate is added to the beaker. Will these modifications affect the experiment in any way?
Which is the gas accumulating in the test tube?


A

Carbon dioxide

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B

Oxygen

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C

Nitrogen

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D

Ozone

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Solution

The correct option is B

Oxygen


The correct option is (B):
Explanation for the correct option:

  1. The given experiment is performed to show the process of photosynthesis.
  2. In this experiment, the subject taken is Hydrilla.
  3. Photosynthesis is the process by which green plant cells prepare food by utilizing CO2, H2O and chlorophyll in the presence of sunlight.
  4. During this process, carbon dioxide and water are converted into carbohydrates.
  5. During photosynthesis, water is photolyzed into oxygen and hydrogen and it provides the energy for photosynthesis.
  6. Reaction:
    1. 6CO2 + 6H2OChlorophyllSunlightC6H12O6 + 6O2

Final answer: Oxygen is accumulated in the test tube.


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