"..that the rapeseed could produce oil for astronauts, potatoes could feed them, and cotton could clothe them."
And the fruit flies can annoy the crap out of them..
This isn't groundbreaking in any way, as many biological experiments of greater complexity have been conducted on the ISS, Shuttle, MIR, and probably Skylab. But since the Chinese don't have a space station or orbiter (yet), I can see why they would want to try it. And I guess claiming to be the first to grow something on the moon is worth some props. What would be useful though would be to study the effects of solar and cosmic radiation on their progeny, but I doubt they'll live long enough for radiation to be a factor in any way.