Question

The balloon-shaped structures called tyloses

• A. are linked to the ascent of sap through xylem vessels
• B. originate in the lumen of vessels
• C. characterize the sapwood
• D. are extensions of xylem parenchyma cells into vessels

Answer 1

The correct option is D are extensions of xylem parenchyma cells into vessels

The tyloses are the structures found in the woody tissues (heartwood) of dicot stems. These are the extensions of xylem parenchyma cells into the vessel elements. Tyloses are filled with starch, resin, gums and other substances. They provide rigidity to the wood and increase durability.They are also important in healing wounds and giving resistance against the pathogens.