Discovery of which one of the following is connected with the use of an old sample of $DNA$ in a culture medium?

What reason will you assign for the use of coconut milk in tissue culture?

Study the following statements:
$I.$ Cytokinins are formed primarily in roots.
$II.$ Auxin and cytokinin are antagonistic in apical dominance.
$III.$ Kinetin (a modified $DNA$ purine) was discovered from herring sperm.
$IV.$ Zeatin is auxin.
$V.$ Zeatin was firstly extracted from herring.
Choose the incorrect one.

$A$ plant hormone used for inducing morphogenesis in plant tissue culture is

What is the function of cytokinin?

In plants,which hormone induces $RNA$ synthesis?