In which case(s) did the Supreme Court of India give for the first time the doctrine of ‘basic structure’ of the Constitution?

In which of the following cases, the Supreme Court of India enunciated the ‘Doctrine of Basic Structure’?

The landmark Supreme Court judgment in the case Subhash Sharma v. Union of India (1991) refers to which one of the following basic features of the Constitution of India?

Which Article of the Constitution of India deals with the Appellate Jurisdiction of the Supreme Court in connection with Constitutional Cases?

Under which case did the supreme court of India include the right to education with in the right to life?

Which one of the following organizations challenged the constitutionality of Section 377 of the Indian Penal Code in the Supreme Court of India?