/root permission reset on boot

[Nerius Landys]

I'm running FreeBSD 7.1 i386, and even after I "chmod 700 /root",
after a reboot it goes back to permission 755.
1. What's the reason for this?  There must be a good reason and I
would like to know it.  Everything in FreeBSD just makes sense and is
well designed (honestly, no sarcasm here).
2. Would I  want to change the permission of /root to 700 permanently, and how?

- Nerius