HomeWhy do fish and other living things have different roles in the aquarium?What are the functions performed by plants? How do plants provide oxygen?

How do plants provide oxygen?
      Plants can produce their own food by the process of photosynthesis. During photosynthesis plants use light energy and carbon dioxide to produce sugar and oxygen. The oxygen is released into water where it dissolves. Fish and other aquarium inhabitants use this dissolved oxygen to breathe.

What are some different kinds of plants in an aquarium?
What is a light source and how is light provided in an aquarium?