$RNA$ formation is induced by

$A$ : Cytokinin along with the auxin are required for morphogenesis.
$R$ : More cytokinin to auxin ratio promotes root initiation during micropropagation.

Which hormone is concerned chiefly with cell division in plants?

Which of the following helps to overcome apical dominance?

Richmond-Lang effect is related with . . . . . . .

Zeatin has been obtained from