Question

(a) What is ‘Veto power'? Why does it affect they
efficiency of the UN?​

Answer 1

Answer:

A veto is the power to unilaterally stop an official action, especially the enactment of legislation

Whenever one of the permanent members of the UN Security Council uses their veto it leads to a paralysis of the United Nations as a whole. When a resolution could provide the UN with an opportunity to act in an event to maintain international peace and security, a veto binds the UN to observe an event from the outside.