Answer:
nani? this is a biology/science question, why did you mark this as english???
also this question does not has to be right, since hypothesis is your thought about this question.
here's my hypothesis (does not have to be yours): <-- not a unhappy face
I think the the grass would absorb water over the course of two days, and the shallow container would still have the same amount of water after 2 days
:) i hope this helps