Questions

The Parliament cannot amend those provisions which form the ‘basic structure’ of the Constitution. This was ruled by the Supreme Court in the Kesavan and a Bharati Case. (1973)

Basic Structure of the Indian Constitution is not defined. But according to SC, the basic structure can be evolved but cannot be destroyed. Hence it falls within the constituent powers of the Parliament. Hence both 1 and 3 are correct.

Primary succession is the orderly and predictable series of events through which a stable ecosystem forms in a previously uninhabited region. Primary succession occurs in regions characterized by the absence of soil and living organisms.

Foreign keys are the columns of a table that points to the primary key of another table. They act as a cross-reference between tables.

In detail : A Foreign key is a field (or collection of fields) in one table that uniquely identifies a row of another table or the same table. In simpler words, the foreign key is defined in a second table, but it refers to the primary key or a unique key in the first table.