Question

Cell wall consist of
A. Lignin, hemicellulose, pectin, lipid
B. Hemicellulose, pectin, protein, lipid
C. Cellulose, hemicellulose, pectin, lignin
D. Cellulose, hemicellulose, tubulin, lignin

Answer 1

Hint: the cell wall of the growing cells is made up of the carbohydrates, so from the given options sort out the one’s having all the carbohydrates. Protein helps in maintaining the structure of the cell wall.

Complete answer:
If we talk about the cell wall, the first thing which comes into our mind is that it provides the structural rigidity to the cells and it functions as a barrier by which nothing can get inside the cell. Cell is more of a chamber for cells. We know that this cell wall provides structure to cells but what things provide structure to the cell wall.
When the cell is growing, the main thing which plays a role is the carbohydrates. These carbohydrates are of many kinds like monosaccharides, disaccharides and polysaccharides mainly. So, for the composition of cell walls what we require mainly is the polysaccharides as they have a harder structure and will completely fulfil their function making the cell wall rigid. Also, the movement across the cell wall is not possible without cell permission and polysaccharides are responsible for that. The primary polysaccharides which are generally composing the cell wall are cellulose, hemicellulose and pectin. The cellulose and hemicellulose fibers cross links together forming a mesh like structure and the pectin is responsible for the growth of this mesh like structure and also helps in increasing the extensibility of the cell wall.
The proteins are also present in the cell wall which helps in making the cell wall more rigid. The protein concentration in a cell wall is about 10-25%. The protein which is commonly used is lignin which binds itself together in between the meshes of cellulose and hemicellulose by removing the water molecules and thus eventually strengthening the cell wall.

So, the correct answer is option C.

Additional Information: To provide the cell wall a water proofing and the permeability to specific substances is because during development, the cell wall is impregnated with cutting and wax and it is called plant cuticle.

Note: The tubulin and lipid are also a part of the cell wall but their primary function is transport of constituents across membranes and storing energy respectively. Making a cell wall is their secondary function.