Shruti in an experiment, put a healthy, green plant in different conditions during a day, at different times P, Q and R. The rate of oxygen absorbed or released by this plant is shown in the given graph.
Which of the following assumptions can be made about this experiment?
AAt time P, that plant was put in a dark cupboard.
BAt time Q, plant is not respiring because, no oxygen is being taken up.
CAt time Q, the plant was moved to a dark room.
DAt time R, the plant was put in a well lighted place.
The answer given by Olympiad trainer is B but We all know that plants respire all the time. May I know the right answer