The main effect of the pun in the excerpt is that it
confuses the reader.
creates a funny moment.
creates a serious moment.
explains something to the reader.
jack. my dear algy, you talk exactly as if you were a dentist. it is very vulgar to talk like a dentist when one isn’t a dentist. it produces a false impression.

The right answer is: It creates a funny moment.

Explanation: In this excerpt from Oscar Wilde's The Importance of Being Earnest, Jack/Ernest is replying to Algernon's request: "Come, old boy, you had much better have the thing out at once." Algernon wants to find out why Jack is also Ernest, but he is trying to downplay the issue by expressing himself in such humorous way. Jack's reply is also humorous, thus contributing to the overall sarcastic and funny tone of the conversation.    

the african society basically suffered the consequences of colonization and apartheid directly attacking the black people, first, during the colonialism and its main idea which which "white people" had better rights, affecting   them principally in the right to establish black people in their territories, access to quality education and health services and took away any civil right even to the black people to feel they have the same opportunities as the settlers.

did you ever get an answer? i'm on the same question : (