GENERAL HISTOLOGY

Detailed explanation-1: -The cell wall is present only in plants and in some fungi, bacteria and algae. It is present outside the cell membrane and is tough, flexible and sometimes rigid in its texture. It is mainly composed of cellulose, long fibres of carbohydrates including hemicellulose, lignin and pectin.

Detailed explanation-2: -The cell wall is made of a tough fiber called cellulose which does this job. When you combine the stiff cell wall with the outward pressure of a full cell sap vacuole, you get enough strength to hold up large plants. Tree cell walls contain other tough materials such as lignin, which make them even stronger.

Detailed explanation-3: -The given statement is true. The cell wall is made up of tough fibers. It is a structural layer which covers some cells outside the plasma membrane. The cell wall can be flexible, tough and rigid sometimes.

Detailed explanation-4: -The cell wall is composed of a network of cellulose microfibrils and cross-linking glycans embedded in a highly cross-linked matrix of pectin polysaccharides. In secondary cell walls, lignin may be deposited.

Detailed explanation-5: -Plant cell walls are primarily made of cellulose, which is the most abundant macromolecule on Earth. Cellulose fibers are long, linear polymers of hundreds of glucose molecules. These fibers aggregate into bundles of about 40, which are called microfibrils.