Two green plants are kept separately in oxygen free containers, one in the dark and the other in continuous light. Which one will live longer?

The plant kept in dark

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The plant kept in light

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Both the plants will live for the same time

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None of the above

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Solution

The correct option is B The plant kept in light
The plant kept in continuous light will live longer, because it will be able to produce oxygen required for its respiration by the process of photosynthesis.
Oxygen is evolved as a by-product of photosynthesis during photolysis of water.
So, the correct answer is option B.

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