Option 1: To develop scientific temper, humanism and the spirit of inquiry and reform. This means that citizens are expected to cultivate a scientific mindset, promote human values and ethics, and actively seek knowledge and innovation. This helps in the progress and development of the nation.

Option 2: To safeguard public property and to abjure violence. This means that citizens have a duty to protect public property and refrain from engaging in any form of violence. This ensures the preservation of public resources and a peaceful society.

Option 3: To uphold and protect the sovereignty, unity and integrity of India. This means that citizens are obligated to defend and safeguard the independence, unity, and territorial integrity of India. It emphasizes the importance of national unity and the protection of the country`s sovereignty.

Option 4: To practice family planning and to control population. This option is NOT a Fundamental Duty of citizens. While population control is important, it is not listed as a specific duty in the Constitution. However, the government does enact policies and programs to promote family planning and population control.

In conclusion, the correct answer is option 4 as it is not a Fundamental Duty of citizens of India.