Explanation:

- The Council of States is another name for the Rajya Sabha, which is the upper house of India's Parliament.

- The Vice-President of India serves as the ex-officio Chairman of the Council of States (Rajya Sabha), presiding over its sessions.

- The Leader of the Opposition is a member who heads the largest party not in government, providing a counter-balancing view and critique of the ruling party.

- The President of India is the ceremonial head of state and does not preside over parliamentary sessions.

- The Speaker presides over the Lok Sabha, which is the lower house of the Parliament, not the Council of States.