The ethical responsibilities of an IAS officer highlighted in the UPSC syllabus include upholding integrity, accountability, and transparency in governance. Officers are expected to maintain high moral standards and exhibit fairness in decision-making. They must prioritize public interest and welfare, effectively managing resources while being sensitive to diversity and inclusivity. The role also requires emphasizing the importance of ethics in public administration, guiding their actions to avoid conflicts of interest and corruption, thereby enhancing the trust between citizens and the government.