Which of the following is NOT a fundamental duty of an Indian citizen?

Correct Answer: To vote in public elections

Explanation:
The Fundamental Duties of Indian citizens are incorporated in Part IV-A (Article 51A) of the Constitution of India. They were added by the 42nd Constitutional Amendment Act, 1976, upon the recommendation of the Swaran Singh Committee.

Let us analyze each option against the list of Fundamental Duties under Article 51A:

1. To value and preserve the rich heritage of our composite culture: This is explicitly listed as a Fundamental Duty under Article 51A(f).
2. To safeguard public property and to abjure violence: This is explicitly listed as a Fundamental Duty under Article 51A(i).
3. To uphold and protect the sovereignty, unity and integrity of India: This is explicitly listed as a Fundamental Duty under Article 51A(c).
4. To vote in public elections: Although the Swaran Singh Committee recommended including the duty to vote in elections, it was NOT accepted or incorporated into Article 51A of the Constitution. Voting in public elections is a statutory right under Section 62 of the Representation of the People Act, 1951, as well as a constitutional right under Article 326, but it is not a Fundamental Duty.

Hence, To vote in public elections is NOT a Fundamental Duty of an Indian citizen.