A) permanent tissues
B) meristematic tissues
C) intercalary tissues
D) secondary tissue .
Correct Answer: B
Solution :
According to histogen theory of Hanstein (1870), the shoot apex is differentiated into three distinct meristematic zones or layers (a) Dermatogen (forms epidermis) (b) Periblem (forms cortex and endodermis) (c) Plerome (forms pericycle) vascular bundles (d) Medullary rays and pith.
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