Question
Vascular tissue in flowering plants develop from
-
phellogen
-
plerome
-
periblem
-
dermatogen
Solution
B.
plerome
Histogen theory for shoot apical meristem has been proposed by Hastein (1870).It advocates that there are three distinct meristematic zones (layers) called dermatogen periblem and plerome. The dermatogen is the outermost histogen giving rise to the epidermis, periblem is the middle one producing the cortex and plerome is the innermost resulting in the certain cylinder (ie, vascular tissue).
Cork cambium (phellogen) is the secondary lateral meristem found in the outer cortical region. Its cells divide periclinally cutting offf cells towards the outside (formingcork or phellem) and inside (forming secondary cortex or phelloderm).
