The pop-up questions at the end of this level ask whether a banana is more closely related to a lemon or an onion. Why might the correct answer be surprising to many people? Explain.

The reason why the final answer may be surprising to a lot of people is that

Onion is not a fruit, it is a vegetable while banana is a fruit; likewise, lemons and they are both yellow fruits.

Because they are both yellow fruits, one may have the thought that a lemon and a banana are more closely related.

It may also be confusing to lots of people because some plants that produce vegetables are more closely related to plants that produce fruits and it goes vise versa.