During a discussion on the upcoming EU referendum, author Jill Kirby said that David Cameron intended to "pave the way from Ankara to Brussels" attracting 75 million Turks.
But Joseph Moore, a politics and history student at University of Hull, swiftly responded, rubbishing Kirby's claims as "scaremongering".
Kirby, a former director of the think tank Centre for Policy Studies, told the audience: "We cannot control our borders. David Cameron wants to pave the way from Ankara in Turkey to Brussels so that Turkey can join the EU.
"That's 75 million people, Turkey is bordered by Syria, Iran and Iraq, do we think that's going to improve our security situation?
"Do we think there's going to be a possibility that we're going to know whose at large in Europe?"
Yet in a swift response, Moore said: "I'm undecided on the remain or leave, but I wanted to refer back to Jill's point about 75 million Turks coming to the UK.
"That's really just scaremongering.
"Saying that 75 million are going to come here - that's not going to happen.
"For Turkey to join the EU, they've got to fulfill I think 20 conditions, and the reality is they only fulfill three of them at the moment.
"For them to join the EU, it's a long, long way off."
Turkey has thus far made "good progress" on five out of 35 requirements to become a member of the European Union.
Yet only one requirement, covering achievements in science and research, has been fully completed.
And it has achieved just 35 out of 72 requirements to enter the EU's free visa zone - which allows travel with fewer restrictions.
The normally combative 'Question Time' displayed a moment of poignancy on Thursday night.
Tory Greg Clark put party politics aside when he praised Labour’s Andy Burnham on the Hillsborough enquiry verdict.
Earlier, Burnham responded to allegations of widespread anti-Semitism within the Labour party, saying if it was true he would "cut up" his membership card.