Question

Porous wood is characterized by
A. Absence of tracheids
B. Presence of vessels
C. Absence of vessels
D. Presence of sieve tubes

Answer 1

Hint: Wood, fibrous and porous tissue in stems and roots of trees. It is composed of cellular fibres. Its chemical composition is \[50\% \] carbon, \[42\% \] oxygen, \[6\% \] hydrogen, \[1\% \] nitrogen and \[1\% \] other elements like calcium, sodium, iron etc.

Complete step by step answer:
Any wood with a structure that includes hollow tube-like cells known as pores or vessels called porous wood. The porous surface allows the things to flow through them easily like cardboard, pumice stones, paper, sponges, untreated wood, drapes, carpet are the examples of porous wood.
The three main components of wood are:
Crystalline polymers are called Cellulose derived from glucose.
Hemicellulose which is a five carbon sugar linked irregularly.
Lignin is based on aromatic rings which confers the hydrophobic properties.
Uses of wood are:
Fuel.
Construction
Furniture and Utensils.
Sports and Recreational equipment.
The three main types of wood are: hardwoods, softwoods and engineered wood. Hardwoods are of two types: “ring porous” and other is “diffuse porous”. Open grain hardwood like oak and ash are the “ring-porous” wood species while close grain hardwood such as cherry, birch etc are “diffuse-porous” species.
The correct answer is the presence of vessels.

Option B is the correct answer.

Note: In diffuse porous wood, the vessels remain with the same diameter in the entire season while in ring porous wood, vessels are much larger at the start of growing season than at the end of the season.