In the Parliamentary system the government of the country govern the governance from the parliament.
In India The head of the legislative assembly is the president, is the nominal executive (the jure executive or titular executive).
While the prime minister is the real executive (de facto executive).
Therefore the point you can observe here that the Prime minister is the head of the government, and the president is the head of the states..
According to the Constitution of india the article 74 provides that the council of ministers headed by the the Prime minister is to aid and advise the president in the exercise of his functions. The advice is so tendered is binding on the president.
Bicameral legislature or Bicameral parliament
Due to the bicameral legislation system, the Indian parliament has devided into two houses. The lower house ( lok sabha)and the upper house (rajya sabha)
The members of the Lower houses are directly elected by the people of india (representative of peoples), while the members of the upper house are elected by the indirect method of election in to parliament by a single transferable vote. (Council of states).
Members of each houses
According to the constitution of india the maximum number of seats in the lower house (lok sabha) are 550, but after the year of 1952 the two nominated seats are formed for the Anglo indians. at present there are 543 members into the lok sabha.
While in the upper house (rajya sabha)
Have the maximum number of seats are 250, out of which 238 members will be elected. and 12 eminent persons from the different fields such as science, arts, health, law, etc, will nominated by the president of india. At present 245 member, out of which 12 are nominated by the president (ram nath kovind).