If a green light is shining on a green plant in a red pot what color would the green plant appear to be?

Well, darling, if a green light is shining on a green plant in a red pot, that green plant is going to stay green. The color of an object is determined by the light it reflects, not the light shining on it. So, that plant will continue to look as green as a juicy Granny Smith Apple, no matter what color pot it's in.