Indian constitution has borrowed a great deal of provisions from the Constitution of other countries:
a. Our political leaders were inspired from the various constitutions of the World.
b. Like they borrowed provision of bill of rights from US constitution, idea of Parliamentary form of government from the British.
c. Ideas of socialism were borrowed from Russian constitution , ideals of liberty , equality and fraternity from the French.
d. But it may be noted that all these provisions  were not blindly incorporated . They were thoroughly discussed and debated.

James Wilford Garner said that "Political Science begins and ends with the state"

The Parliament controls the executive in the following ways:
(i) The Prime Minister and the other ministers are taken from the Parliament and after becoming ministers, they remain
the members of the Parliament. They participate in the meetings of the Parliament.
(ii) The ministers are responsible to the Parliament for their actions and policies.
(iii) The members of the Parliament can ask the ministers questions regarding the functioning of the administration. The
ministers are to give a satisfactory reply to all these questions.
(iv) The members of the Parliament by introducing ‘Adjournment Motion’ can invite the attention of the Government to a
serious problem or event.

Yes 

India has adopted many provinces from constitution of other countries.

1. Constitution of USA :- Fundamental rights, judicial review, independence of judiciary, preamble of constitution.
2.Constitution of British:- FPTP, parliament of government, speakers of lok sabha.
3.Irish constitution:- Directive principles of state policy.
4.Canadian constitution:- fedral form of government, idea of residuary powers.
5.German government:- emergency powers.

In the modern time the states are very big, therefore, the indirect democracy prevails.The indirect democracy inevitably brings in election because that is the best way of choosing people's representatives. Voting also has gone through various states. But in most modern countries voting is done by a secret ballot. It means that everyone chooses his/her own candidate in secret. He does not disclose the views about the candidate to whom he favours. Thatway, there is less danger of other people trying to pressurise him.

It is called so because Indian Constitution has borrowed provisions from the constitutions of various other countriesIndia has adopted many provinces from constitution of other countries.

1. Constitution of USA :- Fundamental rights, judicial review, independence of judiciary, preamble of constitution.

2.Constitution of British:- FPTP, parliament of government, speakers of lok sabha.

3.Irish constitution:- Directive principles of state policy.

4.Canadian constitution:- fedral form of government, idea of residuary powers.

5.German government:- emergency powers.

The two different views are examined below:

(i)Liberty and equality are opposed to each other : There is a view point that both liberty and equality are opposed to each other and they cannot go side-by-side. The main advocates of this view point are De Tocqueviflle and Lord Acton. According to Lord Acton, “The passion for equality has made vain the hope for liberty.” Equality curtails individual liberty. If everybody is considered equal in the eyes of law and equality is established in economic sphere than liberty will be curtailed. Nobody will have the liberty to earn money according to his own sweet will. If equality is established then the intelligent and hard working people will not be able to develop their personality to the full. People are of the opinion that nature has not created all the people equal. So liberty and equality cannot go side-by-side.

(ii) Liberty and equality are related to each other : In the modern age, most of the thinkers do not accept the view point that liberty and equality are closely related to each other. It is said that liberty in the absence of equality is meaningless. Prof. Laski, Prof. Towny Pollard and Maclver are the thinkers who support this view point. In fact, the liberty does not mean the same work and equal wages for all the people.

A Constitution is necessary because of the following reasons:

• It is an important law of the land. It determines the relationship of the citizens with the governments.
• It lays down principles and guidelines which are required for people belonging to different ethnic and religious groups to live in harmony.
• It specifies on how the Government would be elected and who will have the power and the responsibility to take important decisions.
• It outlines the limits on the power of the Government and tells us about the rights of the citizens.
• It expresses the aspirations of the people about creating a good society.