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.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.