Which of the following plants depicted in the image will provide oxygen rich air during the day?
Although plants A and B are purple in color, they have green pigment hidden under the purple pigment. They undergo photosynthesis like any other plant and will provide oxygen rich air like the green potted plant depicted in option D.
Option C is the Rafflesia flower and is heterotrophic in nutrition. It has no leaves and is parasitic in nature. Therefore it will not release oxygen in the atmosphere.