LIFE SCIENCE

Detailed explanation-1: -A cell wall is a structural layer surrounding some types of cells, just outside the cell membrane. It can be tough, flexible, and sometimes rigid. It provides the cell with both structural support and protection, and also acts as a filtering mechanism.

Detailed explanation-2: -Examples of organisms with cell walls are plants, fungi, protists (particularly molds and algae), and most bacteria (few exceptions are mycoplasma and L-form bacteria) have cell walls. Animals and heterotrophic protists do not have cell walls.

Detailed explanation-3: -The two major classes of cell wall matrix polysaccharides are the hemicelluloses and the pectic polysaccharides, or pectins.

Detailed explanation-4: -The cell wall is the outer covering of a cell, present adjacent to the cell membrane, which is also called the plasma membrane. As mentioned earlier, the cell wall is present in all plant cells, fungi, bacteria, algae, and some archaea.