The figure given below represents the set-up at the start of a certain experiment to demonstrate ...

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The figure given below represents the set-up at the start of a certain experiment to demonstrate an activity of plants.
(i) What is the aim of the experiment?
(ii) Why has oil been put in each test tube?
(iii) What will be the observation in two test tubes after about 2-3 days?
(iv) Give reason to explain any change observed as answered in (iii).
(v) Why has the test tube B without the plant, been taken in the experiment?

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