NEET BIOLOGY

Detailed explanation-1: -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.

Detailed explanation-2: -Typical components of the cell wall include cellulose, non-cellulosic, and pectic polysaccharides, proteins, phenolic compounds, and water.

Detailed explanation-3: -The cell wall in plant cells is mainly composed of cellulose. It is a linear polymer of glucose which provides mechanical strength to plants.

Detailed explanation-4: -The cell wall is present only in plant cells but not in animal cells because they provide rigidity and support to plants. The cell wall provides definite shape, strength, and protection against mechanical stress and physical shocks. It helps to control cell expansion due to the intake of water.

Detailed explanation-5: -Cell walls are found in most plant cells, bacteria, algae, fungi, and some archaea. In the cells where a cell wall is present, it forms the outermost layer adjacent to the plasma membrane or cell membrane. The cell wall is a rigid semi-permeable structure made up of cellulose or chitin.