Plants are made up of cells with stiff walls.
Each cell has a nucleus housing its DNA and chloroplast factories which use light energy to make sugars.
Mitochondria are the power houses storing energy in the molecule ATP (adenosine triphosphate).
Ribosomes dot the Endoplasmic Reticulum, a wavy membrane with large surface area which ensures that substances moving in and out of the nucleus meet ribosomes on the way.
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