The term 'Plant Growing on Rock' can be summarized as a LICHEN, which is a type of composite organism that is made up of a fungus and an alga living together in a symbiotic relationship. Lichens are found all over the world, growing on rocks, trees, and other surfaces. They are known for their ability to survive in extreme environments, such as deserts and polar regions. Lichens are also important to the environment, as they help to break down rocks and provide food for other organisms.