Both the seats are likely to witness a direct contest between the ruling Trinamool Congress and the BJP, even as the CPI(M) is trying hard to hold its ground in its erstwhile bastions.
The results of the by-elections will be announced on February 1.
The elections were necessitated following the deaths of Sultan Ahmed, the sitting TMC MP from Uluberia Lok Sabha constituency in Howrah district, and Madhusudan Ghose, Congress MLA from Noapara assembly seat in North 24 Parganas district.
The TMC, which had been in power in the Uluberia seat since 2009, has fielded Sultan Ahmed's wife Sajda this time. The CPI(M)-led Left Front had nominated Sabiruddin Molla whereas the Congress has fielded S K Madassar Hossain Warsi.
Uluberia is one of the Lok Sabha seats in the state with nearly 40 per cent Muslim population. The RSS and the BJP made inroads into the constituency following a communal flare-up at Dhulagarh, around 16km from Uluberia, in 2016.
According to the Election Commission, 35 companies of central police forces will be deployed to ensure free and fair elections in both the seats.
The TMC had secured 48 per cent votes in Uluberia seat in 2014 Lok Sabha election, whereas the CPI(M) and the Congress had bagged 31 per cent and 5.71 per cent votes respectively. The BJP had bagged 11.5 per cent votes.
In the Noapara assembly segment, in 2016, the Congress had won the election as an alliance partner of CPI(M)-led Left Front, securing 79,548 votes. The TMC had bagged 78,453 votes while the BJP managed to get 23,579 votes.