I don't think the difference between chem/phys and bio is really one of rote-learning or not - that is, after all, just one method of learning, which students may use or not use as they wish. I do think, however, that bio tends to emphasise so-called "declarative knowledge" rather than "procedural knowledge" - i.e., in bio, it is more important that you _know a fact_, rather than know _how_ to solve a problem. In chemistry, I found it was distressingly the opposite - it was the method that was more important.
I think the phrase "rote learning" slightly obscures this fact, as its certainly possible to "rote-learn" chemistry to some degree - i.e., to know how to manipulate all the data to solve the problem, but have no idea what any of it actually means.