The first three wickets fell for eight runs as they slipped to 3-216 with Root's misfortune accompanied by a full-house "send-off" from his opposite number Virat Kohli.
It was built up as the big battle pre-series, Anderson v Kohli, and while the latter may have got the upper hand after that moment of fortune, you couldn't say Anderson has bowled anything other than superbly, justly rewarded with a couple of lower-order wickets later in the day.
The 29-year old surpassed his previous best score of 39, which he hit in the third Test of the 2014 England tour. Ashwin sent back Cook for 0 with a dismissal similar to the first innings.
Trump pumps up the volume ahead of Juncker visit
President Trump's tariff threats against China, Canada, Mexico and the European Union prompted immediate threats of retaliation. Trump is meeting with European Commission President Jean-Claude Juncker (zhahn-KLOHD' YUN'-kur) on Wednesday.
Root looked imperious, though, and punished any bad balls with four boundaries coming off his bat before lunch in a 57-run partnership with Jennings. Sam Curran stays unbeaten for 67-ball 24* with James Anderson at the opposite end.
The Indian captain's 149 from 225 balls - his first Test hundred on English soil - was an exhibition in marshalling the tail and frustrating the opposition, steering his side from a perilous 100 for five to 274 all out, a mere 13-run deficit for the tourists.
MORNING SESSION: England were only able to add two more runs to their overnight score.
Mohammed Shami needed four deliveries to take the final England wicket.
North Atlantic Treaty Organisation stands by all allies: official says
They are very aggressive people, they may get aggressive, and congratulations, you are in World War Three". A spokeswoman for the German Economy Ministry said: "We want to avoid a spiral of tariffs".
The confident start nearly threatened to unravel in the afternoon before Root and Jonny Bairstow steadied the ship with a 104-run partnership for the fourth wicket. I'm sure within the five-match series there will be plenty of that stuff going on. "I was working on simplifying my actions a bit and make sure I can get more body into the ball, try create something in the air and it worked really well", he said.
England kept Ashwin at bay initially, after the pitch offered him unexpected early turn, and they looked sure to cash in on the good work.
Eyebrows were raised when England named their team on the day before the opening Test started in Birmingham, and that was not purely because of Adil Rashid's recall. "It just happens to be the ball before I got out, and suddenly there's a huge hoo-hah about the pigeon", he laughed it off.
But first-change Curran made it 50 for one in the 14th over when Vijay was lbw on review after missing a well-pitched-up inswinger.
Trump on EU's $5B fine against Google: 'I told you so!'
It's no secret that Google has been quietly working on Fuchsia, a new experimental operating system for tablets and phones . Today's decision rejects the business model that supports Android, which has created more choice for everyone, not less.