Q. The inner, darker and harder portion of secondary xylem that cannot conduct water, in an older dicot stem, is called
A) Alburnum
B) Bast
C) Wood
D) Duramen
Explanation
The inner, darker and harder portion of secondary xylem that cannot conduct water, in an older dicot stem is known as heartwood or duramen, whereas the outer, functional, water conducting, younger secondary xylem constitute the sap-wood or alburnum.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.