Question

The origin of vascular cambium is completely secondary in

Answer 1

The vascular cambium is completely secondary in origin in dicot roots. This means that vascular cambium is absent in the beginning and forms during secondary growth. The vascular cambium is formed from dedifferentiation of permanent tissues. Various tissues such as parenchyma cells below the primary phloem and cells of the pericycle form the characteristic wavy vascular cambium in dicot roots.


The vascular cambium in dicot stem is partly primary and partly secondary in origin. The intrafascicular cambium present inside the vascular bundle in the dicot stem is primary in origin while the interfascicular cambium formed from the cells of medullary rays is secondary in origin. Monocot stem and roots are devoid of cambium and secondary growth does not occur in them.