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Question

Here is the diagram of an experimental set-up to demonstrate a certain phenomenon in plants.
What is the purpose of putting oil in the test tube?

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Solution

The purpose of putting oil in the test tube is to prevent the loss of water by evaporation.

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Similar questions

Given alongside is the diagram of an experimental set-up to demonstrate a certain phenomenon in plants.

(a) Name the phenomenon being demonstrated.

(b) What is the purpose of putting oil in the test tube ?

(c) What is the purpose of the spring balance in the set-up ?

(d) Would it make a difference if the experimental set-up is kept in bright sunshine ?

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Would it make a difference if the experimental set-up is kept in bright sunshine?

Q. The given diagram represents the set-up at the start of a certain experiment to demonstrate an activity of plants. [5 MARKS]
(a) What is the aim of the experiment?

(b) Why has oil been put in each test tube?
(c) What will be the observation in the two test tubes after about 2 to 3 days?
(d) Give a reason to explain any change observed as answered in (c) above.
(e) Why is test tube B without a plant taken in the experiment?

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