Cells wall provides cells with both structural support and protection, and also acts as a filtering mechanism.
if these are absent there is no separation between two cells.
no filtration takes place.
All contents i.e cell organelles don't be proper
Moreover no tissues have definite shape.
proper shape is difficult
Cell walls are present in plants, fungi and prokaryotic cells, where a major function is to act as pressure vessels, preventing over-expansion when water enters the cells. Cell walls are absent from mycoplasmas