All of the sugar produced in the photosynthetic cells of plants and other organisms is derived from the initial chemical combining of carbon dioxide and water with sunlight.
The third way carbon reenters the cycle is through us burning fossil fuels. When we do this, carbon dioxide and water are release into the atmosphere and taken up by plants for use in photosynthesis. Of course, not all of the carbon is immediately taken back up. Some of it remains in the atmosphere, increasing levels of atmosphere carbon dioxide and contributing to the greenhouse effect.
The definition of photosynthesis is the process through which plants use water and carbon dioxide to create their food, grow and release excess oxygen into the air.
Plants are part of a larger group of group of organisms called photoautotrophs. This gigantic term basically means “organisms that make their own food from inorganic (non-living) sources with aide of sunlight.” In other words, photoautotrophs take basic chemicals and, in the presence of light, convert them into more complex molecules that are useful to living things. The basic building blocks of all hydrocarbon molecules come from carbon dioxide (CO2) and water (H2O), which are combined in the process of photosynthesis to create sugars.
Photosynthesis is a chemical reaction that converts “reactants” into “products.” In particular, it is a chemical reaction that builds complex molecules from smaller, simpler molecules. Any process that builds a complicated structure requires energy and the energy for photosynthesis comes from the sun. The basic reaction looks like this.