839 candidates, including from main contenders BJP, BSP, allies Congress and Samajwadi party, RLD as well independents, are in the fray from the seats in 15 districts where 26,823 polling stations have been set up.
Among the electorate are 1.17 crore women and 1,508 belonging to third gender category. The largest constituency in terms of electorate is Sahibabad, while Jalesar is the smallest.
Prominent contestants include Pankaj Singh (Noida seat), son of Union Home Minister Rajnath Singh, Congress Legislature Party (CLP) leader Pradeep Mathur (Mathura) against whom BJP spokesman Srikant Sharma is in fray, Mriganka Singh (Kairana), daugther of BJP MP Hukum Singh and controversial BJP MLAs Sangeet Som and Suresh Rana - Sardhan and Thanabhawan respectively.
Former BJP state president Lakshmikant Bajpai(Meerut), RJD chief Lalu Prasad's son-in-law Rahul Singh (SP) from Sikandarabad, and Sandeep Singh, grandson of Rajasthan Govenor Kalyan Singh from Atrauli are some other key figures.
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BJP is hoping to improve its performance as it had swept the state in the 2014 general elections, which gave the saffron party majority in Lok Sabha, and none of other parties could open their account in the region.
Elaborate security arrangements have been made in all districts.
District Election Officer DK Singh said out of 887 polling centres in riot-scarred Muzaffarnagar, around 600 are critical where video cameras will be installed to maintain the strict vigil.
Spearheading the BJP campaign, Modi had highlighted demonetisation as an "anti-graft" and "pro-poor" measure and promised to push his development agenda in the state.
Young guns Akhilesh Yadav and Rahul Gandhi, who have added a new dimension to the contest with the Samajwadi Party-Congress alliance, have claimed that BJP will face the wrath of the common man who "suffered" due to the note ban.
The districts going to polls in the first phase are
Shamli, Muzaffarnagar, Baghpat, Meerut, Ghaziabad, Gautam Buddha Nagar, Hapur, Bulandshahr, Aligarh, Mathura, Hathras, Agra, Firozabad, Etah and Kasganj.
For all political parties, the stakes are high as the first phase is likely to set the tone for the elections in the remaining six phases.
Chief Election Commissioner Naseem Zaidi, who reviewed poll preparations, said those who had migrated from Kairana for any reason will be extended security if they take part in the polling process in their respective areas.
In another incident, two bullet-riddled bodies, one identified as the brother of an RLD candidate, were found in a mango orchard near Khurja in Bulandshahr district.
In order to check distribution of liquor to voters during elections, the excise department has set up checkposts at the inter-state borders as well as along the border with Nepal.
Besides, the EC has set up a police cell to keep tab on messages received through WhatsApp and social media.
The six other phases of polling will be held on February 15, 19, 23 and 27 and on March 4 and 8, while counting will be taken up on March 11.