He was the lone candidate who filed nomination papers for the post, and will be declared elected tomorrow during the ongoing session of the Assembly.
82-year-old Thimmappa, a former Minister and MLA from Sagara in Shimoga district, was initially reluctant to take the position as he was keen to join the Siddaramaiah Cabinet but was persuaded by the Congress leadership to change his mind.
Meanwhile, seventy members took oath today on the second day of the maiden session of the 14th assembly today, taking the overall figure to 216, after 146 did so yesterday. Of the total current strength of 223 in the House, seven are yet to take oath.
Leader of Opposition H D Kumaraswamy, state JDS chief, was among those who took oath today.
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Outside the Assembly, Kumaraswamy acknowledged that he now has the privilege of serving as Leader of Opposition, a position once held by his father and JDS supremo and former Prime Minister H D Deve Gowda. Both served as Chief Ministers.
He termed as "childish" Tamil Nadu government's move to file a suit in the Supreme Court seeking around Rs 2,500 crore damages from Karnataka for loss of 'samba' and 'kuruvai' crops owing to the non-release of water as per the order of Cauvery Water Disputes Tribunal.
"Instead of filing suit in Supreme Court, it would have been better if she (Tamil Nadu Chief Minister J Jayalalithaa) had filed petition before rain Gods", he quipped.