Q. Heartwood differs from sapwood in
A) Being susceptible to pests and pathogens
B) Presence of rays and fibres
C) Absence of vessels and parenchyma
D) Having dead and non-conducting elements
Explanation
[Solution from source] Heartwood is the dark central secondary xylem. Its elements are dead and filled with tannins, resins, gums and similar deposits, so it no longer conducts water. These deposits make it more resistant to microbes and insects, not more susceptible. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.