In a nutshell, plants perform photosynthesis underwater in the same way plants perform photosynthesis in the air. grana and stroma. At the same time they consume the carbon dioxide respired from the fish. In addition to light, they require the basic raw materials – carbon dioxide (CO2) and water (H2O) for synthesis of glucose (C6H12O6). A plant is a familiar example of an autotroph (Fig. Most plants do perform photosynthesis. Photosynthesisconverts light energy into chemical energy and food. It also helps in cleaning process and preventing entry of microbes. Biology is brought to you with support from the. Chlorophyll: This is the pigment present in plant cell organelle namely chloroplasts. Ability to perform photosynthesis is the main distinguishing feature between green plants and other organisms on Earth. Copyright © Biology Wise & Buzzle.com, Inc.