There was no official "NCAA Football Championship" though #1 Texas defeated #2 Navy 28-6 in the Cotton Bowl to win the 1963 national championship by virtue of the AP and UPI polls.
Ohio State, Wisconsin, and Georgia all shared a piece of the championship in 1942, depending on which polls you looked at.
Roughly a week before the Season Starts.
they were ranked number one all season until they lost to the North Carolina Tarheels in the NCAA men's championship
Basketball: The national championship in the NCAA is decided by a bracket-based playoff system. If the team qualifies for the event on Selection Sunday, they have the same chance as anyone else in the event: 1 in 65 Football: The BCS system is based on statistical analysis and (in no small part) on the opinions of sports writers from various polls. These polls are based on human opinion, so if a team lost by an acceptable amount in the championship game and was anticipated to go to the national championship, the polls and stats could combine to make it happen.
The LSU Tigers (Louisiana State University) were the #1 ranked team in the BCS and in most other polls for the majority of the 2011 football season. LSU was ranked 4th in the AP and Coaches pre-season polls. LSU finished the season 12-0 for the first time in team history, and defeated Georgia 42-10 to win the SEC Championship on December 3, 2011. They were scheduled to played in the BCS national championship game on January 9, 2012, in a rematch against Alabama, who they beat in overtime 9-6 during the regular season.
Yes, in the 1988-89 season.
After the 2000-2001 season.
No team every team lost at least 1 game
The Boston College Eagles won in the 2007-08 season.
the Florida gators
Yes ... the 1981-82 NCAA season at the age of 19.