The hosts piled up 649/9 in their first innings before reducing West Indies to 94 for six in 29 overs when stumps were drawn for the day.
Jadeja had to wait till his 38th Test to reach three figures, having made his debut back in December 2012.
Virat Kohli delivered yet another masterclass as he scored his 24th Test ton and is now the second fastest to reach the landmark after Don Bradman.
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With the series in Australia coming later this year, Ganguly said Shaw would do well there as the young player is a solid back-foot player.
He also defended the field placements of stand-in skipper Kraigg Brathwaite, who opened the field quite early in the game.
He made a dream debut against the West Indies in the series opener, scoring a sublime 134 and, at 18 years and 329 days, becoming the youngest Indian to reach three figures in his maiden appearance.
At 18 years and 329 days, Shaw reached the milestone off just 99 balls, adding to a host of records he holds in his blossoming career.
Indian sports is replete with stories of blood, sweat and sacrifices and Shaw's story is no different from others.
He was the 15th Indian to do so and only the second by an opener. The third fastest Test hundred on debut and the second youngest Indian to score a Test century after Sachin Tendulkar.
At the raw age of 19, Prithvi Shaw becomes India's 293rd Test player as he makes his debut in Rajkot against West Indies.
Shaw (134 off 154) and Cheteshwar Pujara (86 off 130) laid the foundation for a big score with a 206-run partnership after the early loss of K L Rahul (0).
Prithvi has been preferred over Mayank Agarwal in the playing XI for the series opener against West Indies.
The unit is not short on talent but it has little idea of playing in India with only five members of the 15-man squad having featured in a Test in the country.
Kohli said experimentation can only be done in the top-order and has high hopes from the 18-year-old Shaw, who will make his Test debut on Thursday.
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There is not much to gain for India against the eighth-ranked West Indies who, on their part, will be trying their best to make an impression in one of the toughest places to tour.
Nair's exclusion from the two-Test squad for the home series against the West Indies triggered a controversy as he was dropped despite warming the bench through the five-Test series against England.
Roach has been forced to fly back to Barbados following the death of his grandmother.
After spending time on the bench for six consecutive Test matches against Afghanistan and England, the selectors dropped Karun Nair for the West Indies Test series.
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