Why do you have to apply undecided to a certain college in the UC System?

<p>So I'm applying for the fall 2012 term, but I have no clue what I want to do. I might major in something related to science and engineering or maybe arts and humanities. So I'll be applying undecided to all my colleges. However, on the UC app, undecided is separated into different categories depending on the college you're applying to. I also heard that once you pick a certain college to apply undecided, you can't switch to another one if you change your mind. Is there a way around this, or do I just have to close my eyes and pick?</p>

<p>I guess what I’m asking is if I pick “Undecided- Humanities” for example, do I have to declare a major in the Humanities?</p>