All organisms need some source of energy and the primary (and only) source of energy is from food. Now some people may say “Plants don’t eat food” and that’s kind of true but really they just get it in a different way than animals. You may remember this diagram from my last post that you probably can just scroll down a little ways to see.
Source: Benjah-bmm27 on wikimedia commons
As you can see this shows how plants create sugar from carbon dioxide and dihydrogen monoxide and excrete oxygen as a waste product. This sugar is the plants source of energy or its food if you want to call it that. This sugar is called glucose and it’s a rather complex molecule, which is good for plants because the energy comes from the bonds between the atoms of the molecule and when the bonds are broken apart the energy is released. This is also how animals get energy except it comes from other organisms that they eat not from water, carbon dioxide, and sunlight.
CHEMISTREE 