Which hormone is synthesized in root apices,developing shoot buds,and young fruits?

Which of the following plant hormones is responsible for delaying the senescence of plant organs?

Which of the following was isolated and identified by Skoog and Miller?

Which hormone is primarily associated with cell division?

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.

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