Which gibberellin was discovered first?

$A$ : Seeds do not sprout when $ABA$ is overcome by Gibberellins. $R$ : $GA$ inhibits protein and $RNA$ synthesis.

Gibberellin is helpful in

Cell elongation in the internodal region takes place due to

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

Name the plant growth regulator which,upon spraying on sugarcane crop,increases the length of stem,thus increasing the yield of sugarcane crop.