It also helped justify Andrew Strauss's decision to bat after winning the toss in overcast weather that eventually gave way to sunshine.
Pakistan, seeking to avenge their 3-0 series loss in England in 2006, started well with four early wickets but glaring errors by wicketkeeper Kamran Akmal as well as some wayward bowling meant they could not capitalise.
While Morgan's enterprising 182-ball innings, which comprised 18 fours and one six, was chanceless, Collingwood struggled for fluency but battled through.
He survived one chance when he should have been stumped on 48 when beaten by a ripping leg-break from Danish Kaneria, but keeper Akmal fumbled the ball.
Akmal, who struggled with his glovework on the 2006 tour of England and also dropped several chances in Australia in December-January, dropped a simple chance off Strauss when the England opener had scored 15. Strauss went on to make 45.
Morgan was at his best before tea, when he was particularly aggressive against the spinners Kaneria and Shoaib Malik, striking six boundaries in 12 balls at one stage.
The dry pitch is turning and showing early signs of uneven bounce.
Pakistan also suffered from the Decision Review System (DRS), which was employed in England for the first time.
The tourists incorrectly challenged two umpiring decisions to lose their two allocated reviews while England had two successful reviews and lost one.
Pakistan's players wore black armbands in memory of the 152 passengers who died in a plane crash in the hills north of Islamabad on Wednesday.