The detail "...make sure they are not touching each other..." best supports the inference that one bad apple can spoil all the others. As stated in the text, the fruits are stored in the hoard house for future consumption. It is important that one does not contain a bruise since this will also affect the others around it.
It means
a. Green with color
b. filled with chlorine
I think they are watching a match. They do not have enough money to buy the tickets. So, they are watching the match by climbing on their cycles, because the stadium boundary wall is very high.
