Harry plays Quidditch for Gryffindor, which is one of the Hogwarts houses.
Ginny Weasly was in Griffindor. So like all Griffindor Quidditch players, she played for Griffindor.Later she plays for the Holyhead Harpies
You cannot join the Quidditch team on Pottermore.
There's seven on each team, so fourteen total.
7 players 3 chasers 2 beaters 1 keeper 1 seeker
Griffindore House Quidditch Team
There is only one Seeker on a Quidditch team.
That is correct.
The bludger tries to knock players from the opposing team off of their brooms.
Yes, there are 7 players on a Quidditch team and 4 teams at Hogwarts. 7 multiplied by 4 equals 28. Those players are; 1 Keeper, 1 Seeker, 3 Chasers and 2 Beaters. One player on each team is also the captain.
The Bulgarian National Quidditch team
A full team is unknown but the following are known players;Hamish MacFarlan - Team CaptainEunice Murray - SeekerLennox Campbell - SeekerAlasdair Maddock - ChaserAngus Campbell - ChaserFabius Watkins - Chaser