alright, sure thanks. And one other thing looking at the TSFX Summer lecture notes they seem to have quite a few pages on plant hormones. Some of the ones i question we need to know are as follows- labeling the plant leaf, the opening and closing of stomata- talks about K+ ions moving across guard cells depending if day or night time, apical dominance, photoperiodism, seed dormancy, human uses of plant hormones. Are we required to know all of this stuff too. And also are we required to know about the various signalling and pheromones in animals eg visual signalling, sexual pheromones. thank you so much. - cause textbooks seem to make it brief, but TSFX goes on about 10 pages talking about it. Thanks again.