Offer an experience that demonstrates the need for light for plant life.

1) put one plant in the light, the other in a dark room (for example, a closet). Both plants must be watered equally;
2) the plant grows normally in the light, the leaves of a plant in the dark will first turn pale green, then turn yellow, and the plant will die. The reason for the death of a plant in the dark is the lack of light, which is necessary for the formation of chlorophyll and for photosynthesis.