The central lumens are obliterated in
Xylem fibres
Phloem parenchym
Xylem parenchyma
Sieve tubes
Which element of xylem is the characteristic feature of angiosperms?
Exarch' is the condition of vascular bundles in which
The difference in phloem of gymnosperms and angiosperms is due to
Promeristems can be distinguished from primary meristems by
Exarch primary xylem is found in ........