Newly-elected BJP Rajya Sabha candidate Arun Singh today took oath as the Member of the Upper House. Chairman M Venkaiah Naidu administered the oath to Mr Singh. <br />''<br />''The BJP member has been elected unopposed from Uttar Pradesh in a by-election, which was necessitated following the resignation of Samajwadi Party member Tazeen Fatma. <br />''<br />''<br />''<br />