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Question
Give suitable explanation for the following:
Perspiration and transpiration help to cool the body temperature of the organism.
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Solution
In both perspiration and transpiration, water is lost by evaporation from the body of the organism as water vapour. This evaporation reduces the temperature of the body surface and brings about cooling in the body of the organism.
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Differentiate between Transpiration and Evaporation
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State whether the following statement is true or false. Rewrite the false statement correctly.
Transpiration cools the plant when it is hot outside.
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The figure below represents the set-up at the start of 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 observations in the two test-tubes after about 2-3 days?
(iv) Give reasons to explain any change observed as answered in (iii) above.
(v) Why has the test-tube b without the plant, been taken in the experiment?
Transpiration occurs:
