In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

[EX Q]: Corms are undifferentiated, uniform, and contain _ rings when cut apart.
[EX A]: no

[EX Q]: Yeasts are of _ kinds.
[EX A]: two

[EX Q]: Chess is a game, played by _ players.
[EX A]:
two