Explanation:

1. Statement 1: The summoning of the House means convocation.
   • This statement is true. The summoning refers to calling all members of Parliament to meet for a session, which means to convene or to hold a convocation.
2. Statement 2: Prorogation ends a session.
   • This statement is true. Prorogation is an act that ends a parliamentary session. It does not dissolve the House but merely terminates the current session.
3. Statement 3: Dissolution terminates a House.
   • This statement is true. Dissolution means that the term of the current House (typically the Lok Sabha in India) has ended, leading to the need for new elections. It completely terminates the House.
4. Statement 4: Prorogation of a session can be effected by the leader of the House alone.
   • This statement is false. Prorogation is carried out by the President in India, based on the advice of the Council of Ministers under Article 85(2)(a) of the Constitution. The leader of the House does not have the power to prorogue the session on their own.

Conclusion: Out of the given statements, the incorrect statement is Statement 4, as prorogation cannot be effected by the leader of the House alone. Therefore, the correct answer is Only 4.