Cook as given a 'guard of honour' by the Indian team as he walked out to bat in his final Test. The Chef, who will retire from international cricket after this Test, produced a 190-ball 71-run innings to give England a good start before the hosts lost six wickets for 58 runs post tea to collapse from 133-1 to 181-7.
Cook was more solid at the other end, and duly reached his 57th half-century off 139 balls to a rousing reception from the packed crowd.
Cook and Ali got lives as England reached 122-1 at tea. Post lunch, India toiled hard and tightened their lines as the pacers got some seam movement, and could have easily accounted for both batsmen.
Moeen Ali tried to resurrect England's innings with a patient 50 off 170 balls but Ishant returned to take two wickets in three balls in the 83rd over as England further slipped to 181 for 7.
The hosts were going strong at 133-1 when Bumrah dismissed Cook and Joe Root (0) in successive balls in the 64th over and then Ishant removed Jonny Bairstow (0) in the next over to reduce the hosts to 134-4.
Ishant (3/28) picked up three wickets, while Jasprit Bumrah (2/41) and Ravindra Jadeja (2/57) struck twice each to trigger England's collapse in the final session of the opening day.