The opposition is a part of the system and has the right to criticise, but it should be constructive and within dignified limits, he said.
Addressing the first ever Whips Conference here, Das said each day of the legislature should be utilised in the interest of the people, who send their representatives with their desires, aspirations and grievances.
Stressing upon full attendance in the House during sessions, Das said thin attendance was a cause of concern during second half of the day's proceedings.
Assembly Speaker Dinesh Oraon, Leader of Opposition Hemant Soren and MLAs were present in the conference.