Which phytohormone is useful for delaying senescence?

Which of the following is a coconut milk factor?

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

What is the function of cytokinin?

Describe the plant hormones that help in keeping plants evergreen.

An excised leaf does not turn yellow if it is induced to root. This is attributed to the synthesis of which hormone in the root,or which hormone retards leaf aging?