The plant organelle that supports and maintains the cell's shape and protects the cell from damage is the cell wall. This is the answer because you said in a plant cell and the only organelles present in the plant cell that are not present in the animal cell are the cell wall, the central vacuole, and the chloroplasts.
The central vacuole stores water to keep the plant water and refreshed and the chloroplasts convert sunlight into energy and food for the plant so the cell wall has to be the answer because the cell wall is what gives the cell it shape and protects it