Question

Politics ______________(play/plays)an important role in our life
............pls give a reason for the answer and it is subject-verb agreement

Answer 1

plays. it is a verb
because it is always happened i.e., they always strive for the peoples welfare or routine or universal or daily happening actions are write by adding 's' to the verb

Answer 2

Politics plays an important role in our life.

Although 'politics' ends with 's' , it is a singular noun. So 'plays' will be placed after politics, instead of play. Thi is known as subject-verb agreement.