"India seem to have got a good variety of bowlers, especially pace bowlers, which is probably unusual. They have strength in depth in their pace bowling," said cook ahead of the first Test beginning here on Wednesday.
"Over the last couple of years - certainly in the last 10 years I've played them - they haven't had the option of playing five or six different types of seamers. That's different to what I have experienced in the past but we'll see over the next six weeks."
The form of the India's top order seems to be a cause of concern for the visitors but Cook backed struggling Shikhar Dhawan and Cheteshwar Pujara to come good in the series.
"With very good players, form is certainly temporary. The reason they're very good players is the number of runs they've scored in the past over a sustained period of time," he said.
"That's why they're the number one side in the world. You can go a couple of innings not scoring any runs, and suddenly you get a couple away and start to get that rhythm and timing back, and you get a big one. That is the nature of the beast, certainly with top-order batting," Cook said.
Cook said that he is feeling fresh for the challenge against India, a side against whom he has had a lot of success at Edgbaston.
"I feel fresh. I haven't played a huge amount of cricket over the last three and a half weeks. It was nice to score those runs last week (180 for England Lions versus India A). I moved pretty well, I batted pretty well. I feel ready," said Cook, who had scored 294 here in 2011.