Question

Which of the following has perforated wall?
A. Tracheid
B. Vessel
C. Fibre
D. Sclereid

Answer 1

They constitute part of xylem tissues and are made up of tubular structures. They are the main water transporting elements in flowering plants along with tracheids.

Complete answer:
Generally, permanent tissue cells do not differentiate further. Permanent tissues of all cells identical in form and function are called simple tissues. Permanent tissues containing several distinct kinds of cells are considered complex tissues.

The xylem tissues are a complex tissue composed of tracheids, vessels, xylem parenchyma and xylem fibres. Tracheids are long tube-like cells with thick walls made of lignin and have tapering ends. The cells are dead and without protoplasm. The inner cell wall layers have thickenings that differ in shape. Xylem parenchyma stores food and helps to conduct water sideways. The xylem fibres mainly provide support.

Vessels consist of long cylindrical tube-like structures composed of several cells. Each xylem vessel is formed by the connection of a large number of short, wide, lignified dead cells. They are connected by perforations in their shared walls.The vessel cells do not have protoplasm.

Sclerenchyma is a simple permanent tissue. Sclerenchyma can be either fibres or sclereids on the basis of variation in shape, function, origin and growth. The fibres are elongated and pointed cells, with thick cell walls, usually occurring in groups in different areas of the plant. Sclereids are spherical, oval or cylindrical, strongly thickened dead cells with very narrow cavities.

Thus, the correct answer is option B i.e., Vessel.

Note: Vascular bundles form the conductive tissue and transport water, minerals and food materials. Tracheids and vessels are tubular structures of xylem tissues that aid in the vertical movement of water and minerals.