Under the Constitution of India, which one of the following is not a fundamental duty?

Fundamental Duties of India are as follows - 

1. To abide by the Constitution and respect its ideals and institutions, the National Flag and the National Anthem; 
2. To cherish and follow the noble ideals which inspired our national struggle for freedom; 
3. To uphold and protect the sovereignty, unity and integrity of India; 
4. To defend the country and render national service when called upon to do so; 
5. To promote harmony and the spirit of common brotherhood amongst all the people of India transcending religious, linguistic and regional or sectional diversities; to renounce practices derogatory to the dignity of women; 
6. To value and preserve the rich heritage of our composite culture; 
7. To protect and improve the natural environment including forests, lakes, rivers and wild life, and to have compassion for living creatures; 
8. To develop the scientific temper, humanism and the spirit of inquiry and reform; 
9. To safeguard public property and to abjure violence; 
10. To strive towards excellence in all spheres of individual and collective activity so that the nation constantly rises to higher levels of endeavour and achievement