An example of a grad-school level question?
Which human organ system exchanges gases with the environment?

I just took a test in school today. What question was I asked?

Question I was asked: Sir Isaac Newton determined that white light is made up of all the colors of the rainbow. What did he use to discover this phenomenon?

Random question?

Which illness is always caused by an infection?

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Question generated: The Sun appears to move across the sky each day, rising in the east and setting in the west. What causes this apparent motion?

Problem: Write a question you would see in a school textbook.

Answer: The atmosphere of Mars is almost entirely composed of a greenhouse gas. Compared with Earth, which factor accounts for the low, nighttime surface temperatures on Mars?

Problem: Write a question you would see in a school textbook.

Answer:
Which part of the body works closely with the digestive system to transport nutrients to the cells?