Question

Choose the correct answer from the alternatives given. Vessels are not found in,
A. sal wood
B. chir wood
C. teak wood
D. sheesham wood

Answer 1

Hint: As we know that vessels are absent in gymnosperms but perfectly present in angiosperms so we have to find out the gymnosperms plant from the given option. There are also some angiosperms present in which there is a lack of vessels but it is in some cases. Then we can solve this issue quickly.

Complete answer:
Vessel - Vessel is an advanced conducting element of xylem. The vessel is long cylindrical. tube-like structure with lignified walls and a wide (large) central lumen/ cavity.
• The vessel is multicellular, it is made up of many cells called vessel members or vessel elements.
• The vessel is an example of a dead syncyte. Protoplasm is generally absent in vessel cells.
• The end wall is perforated. Thus vessels are more capable of conduction of water in comparison to tracheids. vessels work as a pipeline during conduction of water because of perforation of its end wall due to seasonal effect.
• Vessels have only one pore slit are many pore slit.for this pore slit the vessel Cell walls are interconnected with each other for transportation of water from one to another cell.
> Presence of vessels is a characteristic feature of angiosperms Vessels are usually absent in Gymnosperms but exceptionally vessels are present in some gymnosperms like Ephedra, Gnetum and Welwitschia (order Gnetales).
> Vessels are absent in some angiosperms also these plants such as Yucca, Dagenaria. vessel fewer angiosperms are included. e.g.Winteraceae, Tetracentraceae and Trochodendraceae.
> Tracheids and vessels are called tracheary elements of xylem.
> In flowering plants, tracheids and vessels are the main water transporting elements.
• Syncyte: Structure which is by fusion of cells is called syncyte.
• From all of the options given above are angiosperms except, one i.e. chair wood.

Hence, the correct answer is option (B).

Note: In this type of questions we have to find out first which one is exceptional from others so that it must be answered. As here all examples belong to angiosperms except one i.e chair wood which belongs to gymnosperms only.