A nucleus is like a principal because a nucleus controls a cell and a principal controls the school.
The cytoplasm is like the floor of the school because cytoplasm holds all the organelles of a cell and the floor of a school holds all the objects in a school.
A cell protects and shapes the exterior of a plant cell and keeps it standing, just like how the walls of a school protect and shapes the hard exterior of a school and keep a school standing.
The chloroplast is like the lunch ladies in a school. The chloroplast is responsible for turning sunlight into chemical energy for a cell. Lunch ladies turn ingredients into food for the students and teachers.
The cell membrane is like the security guards of a school. The cell membrane allows for certain things to go in and out of a cell, just like security guards let certain people enter a school.
The Mitochondria is like the energy room in a school. The mitochondria turn glucose into ATP and is known as the "powerhouse" of the cell. The energy room or broiler room makes and provides energy for a school.