Biochemically, photosynthesis can be described and modeled as a chemical reaction. All reactions have two basic parts - the reactants (that will either combine or breakdown) and the products (which are formed by the reactants reacting to make new substances).

Next, you will review some information to learn more about the reactants and products involved in photosynthesis.

Chemical Equation for Photosynthesis

CO₂ + H₂O →(light)→ C₆H₁₂O₆ + O₂

In order for photosynthesis to occur, CO₂ (carbon dioxide) H₂O (water) enter into the plant and are reactants.

After the reaction, C₆H₁₂O₆ and O₂ are formed as products.

C₆H₁₂O₆ is glucose (a monosaccharide, carbohydrate, sugar) and is either converted into ATP to be used as an energy source or is stored in another part of the plant. C₆H₁₂O₆ is the food for the plant.

O₂ (oxygen gas) is a byproduct of photosynthesis and most of it is given off by the plant and released into the atmosphere.

Light (natural or artificial) is the required energy input that drives the chemical reactions of photosynthesis. Without it, photosynthesis cannot occur.

Next, you will watch a video that describes the relationships between photosynthesis and cellular respiration (will be discussed in detail later).

As you watch, pay attention for which chemicals (reactants and products) are used in each process.

Next, you will watch a video about the carbon cycle (we will discuss this in more detail when we cover ecology).

As you watch, listen for the role of photosynthesis in the ecosystems described.