Voter turn-out in the polls that began at 7 a.m., was less in the first two hours in both the constituencies, the officials said. The voting will end at 5 p.m.
Adityanath, who vacated the Gorakhpur seat after his elevation as the Chief Minister, had held it since 1998. The Bharatiya Janata Party's (BJP) Upendra Dutt Shukla is in the fray for the seat this time.
Gorakhpur has 970 polling centres and 2,141 polling stations.
There are 19.49 lakh eligible voters including over 8 lakh women.
The Congress is fighting on its own and has named Surahita Kareem as its candidate.
Heavy security has been deployed in the constituency. A total of 19.63 lakh voters will decide the fate of 22 candidates.
The BJP has fielded Kaushlendra Singh Patel who is pitted against Nagendra Singh Patel of the SP.
The BSP here too is supporting the SP candidate.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)