Question

Lignified cell wall is characteristic feature of
A. Vessels
B. Sieve cells
C. Sieve tubes
D. All of the above

Answer 1

The cells in higher plants contain lignin. The lignin is an organic polymer seen inside the living cells of the plant it makes the plant strong, woody it also helps in transporting the water and minerals. It helps in metabolism of the plant for growth and development of the plant tissues. Lignin is mostly seen in the vascular tissues by storing the food.

Complete answer:
Vessels: The vascular tissue xylem consists of tracheids and vessels for the proper passage of water to the plant tissues. The vessels are distinct because the size of the vessels are small and they don't contain cytoplasm but it can withstand the pressure because the walls of vessels are specifically deposited by lignin. Hence, vessels considered to have Lignified walls
Sieve cells: These are the cells of phloem they help in transport of organic solutes but mostly the sugar components are transported by sieve cells. They contain fragments noted nuclei with pierced endings. The walls are not thicker by the lignin because they help in the transport of the organic solutes unlike water
Sieve tubes: These are the tubes like elongated cells of phloem. They are responsible for the transport of organic solutes like all the cells of phloem hence, the walls contain large pores for the transport of food molecules.
All the above: It cannot be all the above options because xylem and phloem cells have different functions hence the mechanism or the structure of the cells is also different.
So, the correct answer is “Option A”.

Note:
Lignified walls in the vessels helps in the arrangement and the rigidity to the cell. The Lignified cells in the plant tissues exhibit pathogenic activity by recognising the pathogenic activity.