The correct answer is 1, 3, and 4 only. The Fundamental Duties of citizens, as enshrined in Article 51A of the Indian Constitution, emphasize responsibilities such as preserving the rich heritage of India's composite culture (1), promoting scientific temper and spirit of inquiry (3), and striving for excellence in personal and communal activities (4). However, protecting weaker sections from social injustice is not listed as a Fundamental Duty; rather, it is primarily addressed through the Directive Principles of State Policy. Understanding these distinctions is vital for UPSC candidates, as it reflects the balance between rights and responsibilities that is central to India's constitutional framework.