Question

(5 of 6)
how do you \start\ the fermentation tube?
○ you tip it back to remove the air from the tube part.
○ you plug the hole with a cork.
○ you turn the fermentation tube upside down.
○ you seal the tube in a plastic bag to keep out oxygen.
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Explanation:

Fermentation is an anaerobic process. Removing air from the tube part by tipping it back creates an anaerobic environment which is necessary to start fermentation. Plugging the hole with a cork doesn't necessarily remove air, turning it upside - down doesn't remove air effectively and sealing in a plastic bag is not a typical way to start fermentation in a tube.

Answer:

You tip it back to remove the air from the tube part.