All the following statements regarding sieve tube elements are true except

What are the characteristic differences found in the vascular tissue of gymnosperms and angiosperms ?

The process of extraction of separated DNA strands from gel is called elution.

$(a)$ In roots, xylem and phloem in a vascular bundle are arranged in an alternate manner along the different radii.
$(b)$ Conjoint closed vascular bundles do not possess cambium
$(c)$ In open vascular bundles, cambium is present in between xylem and phloem
$(d)$ The vascular bundles of dicotyledonous stem possess endarch protoxylem
$(e)$ In monocotyledonous root, usually there are more than six xylem bundles present.

Choose the correct answer from the options given below:

Which of the following statements is correct?

Definitions / Explanation :

$(i)$ Conjoint vascular bundles

$(ii)$ Secondary growth