Anatomy Of Flowering Plants Question 87
Question: The only plant cells without nuclei among following are:
Options:
A) Cambium cells
B) Xylem vessels
C) Root hairs
D) Companion cells
Show Answer
Answer:
Correct Answer: B
Solution:
Xylem is a complex permanent tissue.
It is a heterogeneous tissue that mainly consists of vessel, parenchyma, tracheids and fibres.
Xylem vessels are mainly involved in the conduction of water which is mainly long tubular structures made up of dead tissue.
The cells are arranged end to end and the cell walls which would normally surround the whole cell dissolve wherever they are touching another cell wall.
This makes a tube (because there is no blocking cell wall). Sometimes, the cells are just filled with holes rather than have no blocking cell-wall.
They have a lignified cell wall and a large central cavity.
The vessel cells are also devoid of protoplasm.
The secondary walls of vessels are filled with lignin, a kind of hard glue. Cambium cells, root hairs and companion cells have nuclei and vacuoles So, the correct answer is ‘Xylem vessels’
BETA
