interfascicular cambium develops from the cells of :
Xylem parenchyma
Endodermis
Pericycle
Medullary rays
Secondary growth is absent in
The functional xylem of dicot tree is
In a stem which is covered by periderm and in which stomata are absent, gaseous exchange takes place through
Arrange the following in the sequence you would find them in a plant starting from the periphery-phellem, phellogen, phelloderm.
Trunks of some of the aged tree species appear to be composed of several fused trunks. Is it a physiological or anatomical abnormality ? Explain in detail.