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In the experimental set-up to show that "the germinating seeds give out the carbon dioxide." Answer the following question:
(i) Why do we keep the conical flask airtight?
(ii) Name the substance kept in the small test tube inside the conical flaskt. Write its role.
(iii) Why does water rise in the delivery tube?

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(i) To prevent the escape of the gases `(CO_(2))` released during germination the conical flask is kept airtight.
(ii) KOH solution is kept in the small test tube. It is used to absorn carbon dioxide.
(iii) Germinating, seeds release `CO_(2)` which is absorbed by KOH this creates a partial vacuum which caused the water in the delivery tube to rise.

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