pith
primary xylem is primary in nature & is derived from procambium. But secondary xylem is secondary in nature and derived from fascicular cambium and interfascicular cambium. Primary xylem is differentiated into protoxylem and metaxylem, but secondary xylem has no such differentiation. In primary xylem vessels and tracheids are long and narrow, and vessels don't have tyloses, but in secondary xylem, vessels are blocked by tyloses, and vessels and tracheids are wider and shorter. Xylem fibres are more abundant in secondary xylem , and found in small numbers in primary xylem. Also unlike in primary xylem, secondary xylem has differentiated into sapwood & heartwood.
Secondary xylem
C. secondary xylemI'm positive its c. secondary xylem
Xylem
secondary xylem
vascular cambium makes secondary xylem and phloem!!
secondary xylem
secondary xylem
xylem and phloem
Vascular cambium
1. Normal type of secondary growth in the cortical and vascular regions adding to the secondary xylem ,secondary phloem and periderm at their proper places 2. Various types of anomalous secondary growth putting paches of xylem & phloem abnormally.
Secondary Xylem