Where is gibberellic acid amylase and starch in a seed such as barley wheat or maize?

Gibberellic acid is found in the embryo of the seed.

Starch is found in the endosperm.

Gibberellic acid activates genes in the DNA of cells in the aleurone layer which then causes amylase to be produced through transcription and translation.

At least I think that's right.