Members of these parties staged a sit-in at the main gate of the Parliament House and were joined by top leaders like Communist Party of India - Marxist leaders Sitaram Yechury, Basudeb Acharia, RJD chief Lalu Prasad Yadav, TDP leader M V Mysura Reddy, Communist Party of India leader D Raja and BJD leader Arjun Charan Sethi.

SP chief Mulayam Singh Yadav joined the protest in the Lok Sabha and, along with Left leaders, demanded suspension of the Question Hour to take up a discussion on the issue.

The House was adjourned for about 20 minutes and later Parliamentary Affairs Minister P K Bansal said a structured discussion on the price situation would take place on Wednesday.

"This is the single-most important issue affecting the daily lives of the people in the country and the government has not taken any concrete action so far. We have been demanding a stop to future and speculative trading in foodgrain for so long, but no step has been taken," Yechury said.