Correct option:(2)Sapwood is the innermost secondary xylem and is lighter in colour
Solution:
- Peripheral region of the secondary xylem is lighter in colour.
- This is termed as sapwood.
- In the trunk and older branches of large trees, only the outer secondary xylem which is sapwood serves in water conduction.
- The inner part which is heartwood is composed of dead but structurally strong xylem.