Bud dormancy is induced by

Which hormone is produced by plants in adverse environmental conditions?

Which of the following plant growth regulators is known as a "Stress hormone"?

Which of the following is a plant hormone?

$I.$ Antagonist to $GA$
$II.$ Promotes bud dormancy
$III.$ Promotes stomatal closure
$IV.$ Promotes abscission layer
Identify the hormone/s which promote/s all these events in plants and choose the correct option.

Several plant growth regulators affect the opening of stomata. The closure of stomata is induced by ...........