Which hormone is helpful in the regulation of xylem differentiation and also in cell division?

$F$. Skoog discovered

Which of the following helps in delaying leaf senescence?

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

Who coined the term 'Kinetin'?

The hormone present in the liquid endosperm of coconut is