describe the role of gibberellin in the germination of barley (see 16.3.4)

explain the role of gibberellin in stem elongation including the role of the dominant allele, Le, that codes for a functional enzyme in the gibberellin synthesis pathway, and the recessive allele, le, that codes for a non-functional enzyme

investigate the effects of immersing plant tissues in solutions of different water potentials, using the results to estimate the water potential of the tissues