Unlike animal cells, plant cells have a tough wall around the membrane. Animal cells just have the flexible cell membrane. In plants it is called the Cell Wall. This helps the plants retain water, stay rigid, and it is also helpful for protection. Cell walls help keep the plant from exploding from too much water uptake!
The leaves in most plants are normally green and that is from organelles called Chloroplasts. These organelles have chlorophyll inside little compartments. When the plant goes through photosynthesis, it uses chloroplasts as a way to trap the energy and convert it into sugars.
Plants also need to retain a lot more water than animal cells do. This organelle helps keep a lot of the water that is brought up by the roots. It is called a Water Vacuole. It looks like a giant blob of water sitting inside a plant cell.