Question

Match the following in column I with column II and choose the correct combination from the options.
List I
A. Xylem vessels
B. Xylem tracheid
C. Xylem fibre
D. Xylem parenchyma
List II
1. Store food materials
2. Obliterated lumen
3. Perforated plates
4. Chisel like end
A. A-3 B-4 C-2 D-1
B. A-4 B-3 C-2 D-1
C. A-3 B-2 C-4 D-1
D. A-3 B-4 C-1 D-2

Answer 1

Hint: Xylem is used as a conducting tissue for water and minerals from roots to the stem and leaves. It also provides mechanical support to the plant parts. It is composed of different types of tracheids, vessels, xylem fibres and xylem parenchyma.
Let's discuss the above options and find the proper answer:

Complete answer:
- Xylem vessels: It is a long cylindrical tube- like structure which is made up of many cells and each has a lignified wall and a large central cavity. The vessels cells are also without protoplasm. They are generally shorter and wider than tracheids and they also have perforated plates.
- Xylem tracheid: These are extended or tube- like cells with thick and lignified walls and tapering ends or chisel- like ends. These are generally dead and without protoplasm. Their walls are hard with lignin.
- Xylem fibres: These have a highly thick wall and obliterated central lumens. They may be either separate or separate. They are the dead sclerenchyma fibres that are located between the vessels and the tracheids. They give mechanical support to the important elements.
- Xylem parenchyma: They are living and thin- walled and their cell walls are made up of cellulose. They store food materials as starch and other substances like tannins. The radial conduction of water takes place by the ray parenchymatous cells.
Hence, the correct answer is A.

Note: In the flowering plants, tracheids and vessels are the main elements that help in the transportation of water. The term xylem was introduced in 1858 by Carl Nageli. The gymnosperm does not have vessels in their xylem.