When you think of food, do you usually come up with images of your favorite food? This is a natural process, since food is important for every living thing. To fulfill this basic need, all living things either make their own food or get it from some other source. Humans can eat both plants and animals. Some animals consume other animals, while some animals eat plants as their food. Ultimately, we see that everybody on this planet is dependent on plants for their food. But then, what do plants eat? Actually, plants "eat" sunlight and a gas called carbon dioxide, both of which are easily available right here on earth. The process by which land plants produce their own food using sunlight and carbon dioxide is known as photosynthesis. While carbon dioxide is absorbed by the leaves, the sunlight is captured by a chemical molecule in the plant, called chlorophyll (Chl). All photosynthetic organisms contain Chl.

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