Explanation:

Tenure of Judges - The Constitution has not fixed the tenure of a judge of the Supreme Court. However, it makes the following three provisions in this regard:
1. He holds office until he attains the age of 65 years. Any question regarding his age is to be determined by such authority and in such manner as provided by Parliament.
2. He can resign his office by writing to the president.
3. He can be removed from his office by the President on the recommendation of the Parliament.
The Supreme Court acts as the custodian of the Constitution through its power of judicial review. It is called the custodian of the Constitution because, of the following functions:-

• To interprete the Constitution in such a way, that the intent of the founding Fathers is taken into consideration.
• To safeguard the fundamental rights of the people of this country.
• To protect the Constitution from any un-constitutional amendments passed by the parliament, by execerising the power of judicial review.