There had been questions all season about the significant drop in sophomore forward Justin Jackson’s shooting percentage since his freshman year. Now there appears to be an answer. Jackson, who saw his 3-point shooting drop from a team-best 43.8 percent to 25 percent in the 11 games he played this season, will miss the rest of the season with a torn labrum, it was announced Thursday. Maryland coach Mark Turgeon, who made the announcement after practice in preparation of Friday’s home game against UMBC, said that the 6-foot-7 Canadian will have surgery “sometime soon.” “We’ve known he’s been hurt for awhile. Ever since we started sitting him out, we knew he had an injury, and it was something we thought he could play through,” Turgeon said. “But we just decided over Christmas that it’s not in the best interest of Justin, and that we were going to go ahead and do the surgery.” Turgeon said that the injury occurred before Jackson came to Maryland.