Explanation

Constitution of 1973:

Zulifqar Ali Bhutto introduced new constitution in Pakistan on August 14, 1973.

According to 1973 constitution, both national assembly and senate elect president for Pakistan whereas the prime minister is selected by national assembly.

Bicameral Legislature system was introduced for the first time in Pakistan in the constitution of 1973.

According to this constitution, a candidate must be 25 to contest for the election of national assembly.