Question

What is the correct sequence?
A. Xylem-Cambium-medulla
B. Cortex-Endodermis-pericycle-xylem
C. Cambium-xylem-cortex
D. None of the above

Answer 1

The outermost layer of the body is usually referred to as the cortex. The underlying frameworks are covered. The anatomy or internal structure of the dicot trunk starts from the cortex part.

Complete answer:
The required sequence of internal tissues in plants can be written from outside to inside as root hairs, epidermis, the cortex, endodermis, pericycle, protoxylem, metaxylem, pith. This gives rise to small single-cell root hairs that rise into the soil to make water and minerals easier to absorb. So, the cortex lies. It consists of numerous thin-walled, intercellular cell parenchymal cells. The endodermis is the innermost layer of the cortex.
It consists of unified cells in barrel form without intercellular spaces. Roots are charged with an impermeable, waxy substance called suberin in the tangential and radial wall of the endoderm. The pericycle then lies. It is a thickened layer of parenchyma needed to shape the vascular and lateral roots. Pith consists in the centre of broad rounded parenchymal cells. Xylem and phloem lie central to the vascular bundle.
So, option B- Cortex-Endodermis-pericycle-xylem is the right response.

Note: The casperian strip is known as the hydrophobia, impermeable, submarine laden root endoderm cells. It prevents the flow by the xylem of the additional soil solution. Vascular changes contribute to xylem secondary and phloem secondary, i.e., the increase in plant component range during secondary development. The endodermal cells in the dicotyledon stem are high in starch grains and hence called a sheath of starch. Protoxylem develops to form metaxylem in a centripetal way.