everything you need to know:
photosynthesis and cellular respiration
photosynthesis is the process in which a plant makes its own food using energy from the sun. just like humans, plants need a source of food.
the picture can be found at http://science.howstuffworks.com/environmental/earth/geophysics/earth3.htm
Photosynthesis takes place in the leaves of a plant. Carbon dioxide and oxygen are able to exit/enter from the stomata. Water is also taken from the roots to the leaves. the chlorophyll (inside the chloroplasts) will absorb the sunlight. When the sunlight is taken it is turned in to a molecule called ATP (energy). Then it will be used to create glucose.
the equation: 6CO2 + 6H2O ------> C6H12O6 + 6O2
Everything on the left side are called reactants. They consist of carbon dioxide and water. With sunlight it becomes the glucose and oxygen (the right side, the products)
Cellular respiration takes place in the mitochondria. It is when a plant takes co2 from the air and uses it to break down its food. Then oxygen is released from the stomata of the leaves.