Why are there meteor shower in the Ursa Major?

Answer 1

There aren't meteor showers "in" the Ursa Major, or "in" any specific constellation. Meteor showers happen here in Earth's atmosphere; sometimes they seem to come from a specific direction (not the "real" direction, but a combination of the meteorites' movement and Earth's movement around the Sun), and are named after the direction (i.e., constellation) from which they come. When meteorites thus come in groups, they are believed to be the remainder of some comet, that happen to cross Earth's path around the Sun.