Plants need other molecules besides glucose. Where do these molecules, such as cellulose and fructose, come from?

cellulose and fructose are made up of glucose. They are ploymers of glucose.

A way for plant to store their energy/food is combining the glucose together forming cellulose and fructose and stored in fruits, roots etc.

the answer is yes, they are born/created, then they grow to their limit then produce offspring, then die.

equal distribution i think.