Ha! i have a bio teacher exactly like ur ag teacher...i feel ur pain...
Well i'm doing my HSC this yr, and we've doing sustainable ag production, which is basically stuff about soil and the environment and how not to damage it, also plant production, stuff like the Nitrogan cycle and photosynthesis and stuff, if ur doin bio a lot of that comes into it, well if u have a decent teacher...
You do stuff about plant and animal reproduction, nutrion and stuff like that, it's a lot of theory but if u like ag, and ur teacher's good it's fun enough