I've already does task 1 and 2, and really they can't give you more information than just water traveling through plants anyway. It really is simple, just revise that area as it will help with task 1, task 2 only asks you questions based on a practical you do, with no knowledge required. Simple as that, really. Do past EMPA papers if you want a feel of how they work, as to where to find them, just search for them on google or something.