Question

The primary cell wall is mainly made up of
(a) Lignin
(b) Pectin
(c) Cellulose
(d) Protein

Answer 1

Hint: The cell wall is a protective, structural layer that surrounds some types of cells, mainly plant cells. The cell wall is located just outside the cell membrane. It acts as a glue between the different cells.

Complete Answer:
Lignin is a class of polymers that creates the main structural elements for the support tissues of plant cells. Lignins do not rot easily and are structurally rigid. Hence, lignins are very important in cell walls for plants, especially in the wood and bark of plants.
Pectin is an acidic structural heteropolysaccharide. Pectin is located in sources like the primary and middle lamellae and cell walls of some terrestrial plants. Galacturonic acid is the main component of pectin. Galacturonic acid is a sugar acid that has been derived from galactose. In food, pectin is also used as a gelling agent. Pectin is also used as a source of dietary fibers in medicine and sweets.
Cellulose is an organic polysaccharide that consists of a linear chain of hundreds to thousands of linked D-glucose units. Cellulose is an important structural unit of the primary cell wall of many green plants and is the major component of the primary cell wall.

So, the correct answer is ‘Cellulose’.

Note:
A protein is an essential element for the human body.
The cell wall is a tough and flexible structure but it can be rigid at times. The cell wall provides structure and protection to a cell and it can also act as a filtration mechanism for the cell. It also helps to control cell expansion due to the intake of water and helps in preventing water loss from the cell.