Attention quickly shifted towards a jubilant Kohli, who blew kisses at Root and mimed his opposite number's "mic drop" celebration from the one-day series.
134 - When Kohli went past that figure, he bettered his paltry 2014 tour aggregate on his only previous Test visit to England.
The second session started as the first had ended, with a wicket.
Jos Buttler, meanwhile, was back at the ground after the England and Wales Cricket Board confirmed that he had gone to hospital during the lunch interval to have an X-ray on his left middle finger.
Watch day three of the first Test between England and India from 10.30am, Friday on Sky Sports Cricket and Main Event.
Winning the toss, England chose to bat first and despite stitching together a couple of 50-run partnerships and a single 100-run partnership, the Indian bowlers kept chipping in with wickets.
Indian captain Virat Kohli scored a maiden Test hundred on English soil on Thursday.More news: Trump calls Cohen's taping of phone call 'inconceivable,' possibly illegal
This is the first of a five-match series. England will doubtless be the happier of the two teams trundling off for tea, the hosts took three wickets - two for Ben Stokes and one more for Sam Curran - to leave India struggling to reach the hosts' below-par first innings total of 285.
It was a peculiar dismissal and it came immediately after a delay in play caused by a pigeon that refused to move from short mid-wicket despite the best efforts of both Jennings and captain Joe Root.
A streaky four off spinner Ravichandran Ashwin saw the 27-year-old Root, in his 127th Test innings, to the 40 runs he had needed to reach 6,000. The opening batsman of India, Shikhar Dhawan along with Murli Vijay added first fifty partnership of Indian innings.
Six of the 61 scores of 50 or more belong to lower-order batsmen who can probably be excused - two each from Stuart Broad and Chris Woakes and one apiece for Dom Bess and Mark Wood.
That was when Sam Curren was thrown the ball and in the spate of eight deliveries the left-arm pace ace got three wickets.
Vijay was the first to fall for 20 as Curran swung the ball back into his pad and won a leg before review.