The main advantages of bicameral legislature are as follows : 

Second Chamber is a Safeguard against the Despotism of a Single Chamber : The second chamber is essential for preventing the first House from becoming arbitrary and despotic. As such a single chamber with all the legislative power can become corrupt and despotic. The second chamber is needed for keeping the first chamber in balance and away from tyrannical tendencies. It is an essential means for safeguarding ourselves against the arbitrariness of the legislature with a single chamber.

Second Chamber is Essential for Preventing Hasty and Ill-considered Legislation : With a view to satisfy mass passions and demands, the single chamber can commit the mistake of passing ill-considered measures in a haste, which can subsequently be a source of big harm to the national interests. The second chamber, with a composition different from the first chamber, can prevent or at least considerably limit such chances. The directly elected lower chamber is liable to be swayed with popular passions resulting into half-baked expediency based on ill-considered laws.

Second Chamber acts as a Revising Chamber : The legislative work in the modern welfare state has become highly complex and technical. It demands a deep and carefully examination of all aspects of the measures which are to be enacted into laws. A single chamber can be guilty of both omission of desired laws and ‘commissions of errors’. There is, therefore, full justification for having a second chamber performing the role of a reviser. Second Chamber Lessens the Burden of the First House. A modem legislature has to pass a large number of laws covering all aspects of social relations. Under the circumstances, a legislature with a single chamber is most likely to be found wanting and unable to meet the heavy rush. Two Houses can together share the legislative work and handle the entire work systematically. The division of work between the two Houses can go a long way to increase the ability of the legislature to cope with the rush of work and to ensure efficiency in handling it.

Two Houses Better Represent Public Opinion : A single House can grow out of tune and fail to keep in pace with public opinion. The second House chosen at a different time can help the legislature in overcoming the above defect and in keeping continuous contact with the public opinion. Essential for giving Representation to Special 

Interests : The second chamber provides a convenient means for giving representation to different classes and interests which need representation but which, for want of proper organization or disinclination for contesting elections or other reasons, do not get such representation in the lower House. Laborers, women, scientists, artists, teachers, intellectuals, writers, special interest groups can be given suitable and necessary special representation in the upper House.

Delay is Useful: The passing of laws by two Houses instead of a single House, leads to some delay. However, this delay is a very useful interval as it helps the crystallization of public opinion on all bills before they become laws. The existence of second chamber, “interposes delay between the introduction and final adoption of a measure and thus permits time for reflection and deliberation.” Bicameralism is a Source of Independence for the 

Executive : The two Houses of the legislature act as checks on each other. The authority and role of each House has a balancing effect on the other. This feature helps the executive to act with more and needed independence.