As epiphytes or parasites some plants depend on other plants.
Support , habitat , shade
That depends on who they are, where they are, and for what purpose the plants are being grown.
Animal life depends on plants in two ways. Plants provide food for many animals and also, the plants provide oxygen for animals
it depends its plants food or pollen
It depends on what plants the horse is allergic to.
plants
It depends on your diet. A vegetarianmight get 100% from plants.
depends on the plant
it depends
depends on the plant
Some plants do, but it depends on the type. All of you who say yes or no, it's not true because it all depends on the type of plant.
Potentially, but it depends upon your definition of "eating". Parasitic plants "eat" other plants.
Water movement in plants depends on the water's surface tension.