The ethical responsibilities of an IAS officer highlighted in the UPSC syllabus include maintaining integrity, accountability, and transparency in governance. IAS officers are expected to adhere to high moral standards while making decisions that affect public welfare. They must demonstrate an unwavering commitment to public service, uphold the law, and act equitably without prejudice. Furthermore, officers are required to navigate complex situations with ethics in mind, ensuring that their actions reinforce public trust and promote a fair administration in society.