If you were to show tylosis within a wood to your students, which kind of wood would you choose?

Correct option is A

Correct Answer: (a)
Explanation:
Tyloses are outgrowths of parenchyma cells adjoining vessel elements that invade the vessel lumen. These arise best in woods with paratracheal axial parenchyma adjacent to vessels.
Information Booster:
Tyloses form as extensions of living parenchyma through pits into vessel cavities.
They help in blocking vessels, contributing to heartwood formation.
Common in hardwoods (e.g., teak, oak).
They reduce permeability, increasing durability.
Paratracheal parenchyma facilitates tylosis because it lies beside vessels.
Additional Information (Incorrect Options):
(b) Fibres’ presence doesn’t affect tylosis.
(c) Non-porous woods lack vessels — tylosis occurs in vessels, so impossible.
(d) Apotracheal parenchyma isn’t near vessels, hence tylosis formation is limited.