Both cell walls of Plants and Fungi are made from Carbohydrates (cellulose in plants and chitin in fungi) and both serve the same purpose, to act as a structure for the cell.
plants
Yes. All cellular structures (so all plants) must have a cell wall.
The cell wall protects and supports the plant cell. but IS NOT the same thing as the cell membrane .
Yes plants have a cell wall and a cell membrane but animals don't have a cell wall, they only have a cell membrane