It is a process, in which, protistans (mainly plants) use energy from the sun to make sugar.. then cellular respiration converts it into ATP (or the fuel).
Here is the reaction...
6H2O + 6CO2 ---> C6H12O6_6O2
or in other words..
six molecules of water plus six molecules of carbon dioxide produce one molecule of sugar plus six molecules of oxygen!
Here's how it works:
When we breathe out Carbon Dioxide the plant takes it up in the leaves. Then when it rains the plant takes it up through the soil. These two mix together in the chloroplast where light is trapped. These to make the substance glucose.
The plants use the energy from the sun(which is converted into chlorophyll) to mix together the Carbon Dioxide, water, and light. This creates food for the plants.
From here on, the process restarts itself.
Just incase you wanted to know, the green pigment in chlorophyll is what makes the plant green! (:
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