Embattled Queensland Arts Minister Ros Bates has come under relentless attack from opposition MPs during state parliament's first question time for the year.

The opposition targeted Ms Bates at every opportunity on Wednesday, quizzing her over undisclosed meetings with lobbyists, and the use of a limousine on a trip to Sydney at taxpayers' expense.

Last year's parliamentary sittings ended in the same vein, questioning Ms Bates over her register of contact with lobbyists and claims of nepotism involving her son.

She was asked on Wednesday why she failed to disclose meetings with several lobbyists, in particular a lunch organised by lobbying firm Barton Deakin.

The minister maintains she didn't have to, because no lobbying took place.

Labor MP Jackie Trad asked why Ms Bates used taxpayer funds to pay for a "luxury, chauffeur driven car" from a limousine company while visiting Sydney last year instead of using a cab.

Ms Bates insisted the car was a "people mover" needed to transport several people and happened to be booked through a limo company.

"It was actually cheaper to have a Tarago-type people mover than it was to order two taxis ... to three or four different locations," she told parliament.

The attack came after a parliamentary committee earlier on Wednesday heard the definition of lobbying had been amended in the lobbyists' code of conduct.

Integrity Commissioner David Solomon said the definition only included circumstances where actual lobbying took place.

This means lobbyists will not need to reveal inconsequential meetings with ministers.

Former minister Bruce Flegg, who lost his cabinet position over undisclosed meetings with his lobbyist son, told the committee some ministers were now refusing to meet with lobbyists at all given the "circus" surrounding the issue.