explain how rice is adapted to grow with its roots submerged in water, limited to the development of aerenchyma in roots, ethanol fermentation in roots and faster growth of stems

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

describe the role of abscisic acid in the closure of stomata during times of water stress, including the role of calcium ions as a second messenger