Green Plant in Water

Last year when I moved to from my university dormitory to the newly rented apartment, a friend came by and gave me two green plants. It was said that simpling put them in the water can raise them up. It's the fact that these two plants grow up silently and final become two big ones.

I really find it fantastic that how can the plants grow by only absorbing the nutritions in water. I never expose them to the sun, but it seems that their Photosynthesis are quite good, since they grow quite well only by using the day light. It's really fantastic.