Notes from NEET topper
Heartwood and Sapwood
In trees, especially during secondary growth, the wood comprises two parts:
-
Heartwood:
- The inner, older layers of secondary xylem.
- No longer conducts water, often darker due to deposition of resins, oils, and other substances.
- Provides structural support.
-
Sapwood:
- The outer, younger layers of secondary xylem.
- Actively involved in the conduction of water and nutrients.
- Generally lighter in color.
