The principle is like the nucleus because the principle tells everybody what to do and the nucleus also tells the organelles what to do.
Membrane
The chloroplast is like the textbooks because the books provide us with information and the chloroplast also provides food for the organelles.
Ribosome
The electricity is like mitochondria because the electricity lets the school run and the mitochondria keep the cell running with ATP.
Cytoplasm
The membrane is like school security because the school security protects everybody in the body and the membrane also protects the cell.
The ribosome is like the school lunch because the school lunch provides the students with lunch that has protein and the ribosome feeds the organelles.
The school walls protect the people in the building like the cytoplasm protects the cell.