Explanation:

Estoppel and res judicata in all cases needs to pleaded. However, limitation is a duty imposed on the courts as well. Even if the parties do not plead limitation the court shall not admit a claim barred by limitation. Section 3 of the Limitation Act lay down that - Subject to the provisions . contained in sections 4 to 24 (inclusive) every suit instituted, appea. preferred, and applicatio.r made after the prescribec period shall be dismissec although limitation has no been set up as a defence.