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

Explanation

To prevent the entry of oxygen/escape of `CO_(2)`/air
ii] KOH absorb `CO_(2)` gas
iii] KOH absorb `C_(2)`, gas/Partial vacuum created.