Which of the following gibberellic acids was discovered first?

$A$ phytohormone,which increases the production of starch hydrolyzing enzymes during the germination of maize seeds,is employed for the following:

At the onset of seed germination,the digestive enzymes like $\alpha$-amylase are produced by the action of:

The gibberellins are plant growth hormones. They cause elongation of stems. Gibberellin was first isolated by Japanese workers from

Gibberellin is helpful in

Which growth hormone is responsible for bolting (internode elongation just prior to flowering)?