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Vascular tissues in flowering plants develop from:
A
periblem
B
dermatogen
C
phellogen
D
plerome
Detailed Solution
According to the histogen theory of Hanstein, the apical meristem consists of three zones of initials called histogens.
Dermatogen is the outermost layer; it gives rise to the epidermis.
Periblem is the middle zone; it gives rise to the cortex, including the endodermis.
Plerome is the central zone; it gives rise to the stele, i.e. the pericycle, vascular tissues (xylem and phloem) and pith.
Phellogen is the cork cambium, a lateral meristem that forms cork and secondary cortex during secondary growth; it does not form vascular tissues.
So the vascular tissues in flowering plants develop from the plerome.
Dermatogen is the outermost layer; it gives rise to the epidermis.
Periblem is the middle zone; it gives rise to the cortex, including the endodermis.
Plerome is the central zone; it gives rise to the stele, i.e. the pericycle, vascular tissues (xylem and phloem) and pith.
Phellogen is the cork cambium, a lateral meristem that forms cork and secondary cortex during secondary growth; it does not form vascular tissues.
So the vascular tissues in flowering plants develop from the plerome.