The given statements are as follows:

1. The elections were held for the formation of the constituent assembly in 1946 under the Cabinet Mission plan.
2. The Advisory Committee on Fundamental Rights, Minorities, and Tribal and Excluded Areas was headed by Vallabhbhai Patel.

Let's analyze each statement in detail:

1. Elections for the formation of the constituent assembly in 1946 under the Cabinet Mission plan:

The statement is correct. The Cabinet Mission plan was announced on May 16, 1946, by the British government with the aim of resolving the constitutional deadlock in India and facilitating the transfer of power. The plan proposed the creation of a constituent assembly to draft India's constitution. The elections for the constituent assembly were held in July-August 1946, based on the provisions of the Cabinet Mission plan. The elected members of the constituent assembly then went on to draft the Constitution of India.

2. Advisory Committee on Fundamental Rights, Minorities, and Tribal and Excluded Areas headed by Vallabhbhai Patel:

The statement is incorrect. The Advisory Committee on Fundamental Rights, Minorities, and Tribal and Excluded Areas was not headed by Vallabhbhai Patel. Instead, it was headed by B.R. Ambedkar. The committee was formed to discuss and recommend provisions related to fundamental rights, protection of minorities, and the rights of tribal and excluded areas in the proposed constitution. Vallabhbhai Patel played a crucial role in the integration of princely states into the Indian Union but did not head this particular committee.

In conclusion, statement 1 is correct, while statement 2 is incorrect. The elections for the formation of the constituent assembly did take place in 1946 under the Cabinet Mission plan. However, the Advisory Committee on Fundamental Rights, Minorities, and Tribal and Excluded Areas was headed by B.R. Ambedkar, not Vallabhbhai Patel.

Summary:
- Statement 1: Correct. Elections for the formation of the constituent assembly were held in 1946 under the Cabinet Mission plan.
- Statement 2: Incorrect. The Advisory Committee on Fundamental Rights, Minorities, and Tribal and Excluded Areas was headed by B.R. Ambedkar, not Vallabhbhai Patel.