Given a fact, create a question that can be answered using the fact. Construct the question such that it is unambiguous, has a unique answer and the answer can be given using the fact.

Fact: chemical splashing sometimes occurs during experiments
When doing experiments?

Fact: the smell of rotting meat attracts flies
What would a fly find most compelling?

Fact: when a plant grows , the number of the leaves of that plant may increase

as an evergreen matures and grows, it's leaves tend to?