Cook was watchful against the new ball
Cook was watchful against the new ballGetty Images
Alex Hales, however, never quite settled ...
Alex Hales, however, never quite settled ...Getty Images
... and on 10, he was bowled by a beauty from Mohammad Amir
... and on 10, he was bowled by a beauty from Mohammad AmirGetty Images
Amir celebrated with gusto after prising the opening
Amir celebrated with gusto after prising the openingGetty Images
Joe Root received a warm welcome from Amir, who struck him on the shoulder
Joe Root received a warm welcome from Amir, who struck him on the shoulderGetty Images
... but Cook continued to grow in confidence
... but Cook continued to grow in confidenceGetty Images
... while Root settled in against the legspin of Yasir Shah
... while Root settled in against the legspin of Yasir ShahGetty Images
Root was especially strong through the off side
Root was especially strong through the off sideGetty Images
After lunch, Root reached his fifty from 86 deliveries ...
After lunch, Root reached his fifty from 86 deliveries ...Getty Images
... and Cook followed suit from 90
... and Cook followed suit from 90Getty Images
Yasir endured a frustrating afternoon...
Yasir endured a frustrating afternoon...AFP

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...as Cook and Root took their partnership beyond 150
...as Cook and Root took their partnership beyond 150Getty Images
With tea looming, Cook reached his 29th Test hundred
With tea looming, Cook reached his 29th Test hundredGetty Images
... placing him level with Don Bradman in terms of hundreds scored
... placing him level with Don Bradman in terms of hundreds scoredGetty Images
Root was first to congratulate his captain
Root was first to congratulate his captainAFP
Cook was bowled for 105 by a delivery from Amir that kept low
Cook was bowled for 105 by a delivery from Amir that kept lowGetty Images
...but Root soon added a hundred of his own, his tenth in Tests
...but Root soon added a hundred of his own, his tenth in TestsGetty Images
James Vince, however, failed to impress before falling for 18
James Vince, however, failed to impress before falling for 18Getty Images
Vince has now made 130 runs at 18.57 in seven Test innings
Vince has now made 130 runs at 18.57 in seven Test inningsGetty Images
Root continued on serenely during the evening session
Root continued on serenely during the evening sessionGetty Images
Gary Ballance added 73 with Root before chopping on to his stumps late in the day
Gary Ballance added 73 with Root before chopping on to his stumps late in the dayGetty Images