Bubbles are produced by the plant when the lamp is switched on because the plant is undergoing photosynthesis. During photosynthesis, plants use light energy from the lamp to convert carbon dioxide and water into glucose and oxygen. The oxygen is released as a byproduct of this process, and accumulates in the form of bubbles on the surface of the plant. The bubbles are evidence of the plant's ability to produce oxygen, a crucial part of the Earth's ecosystem and necessary for the survival of many living organisms.
