Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Example Input: When gas particles heat up, pressure increase.
Example Output: Does pressure increase or decrease when gas particles heat up?

Example Input: Some viruses carry a few viral enzyme molecules within their capsids.
Example Output: Some viruses carry a few viral enzyme molecules within their what?

Example Input: The stem is the basic structure that holds plants upright, allowing plants to get the sunlight and air they need.
Example Output:
What is the basic structure that holds plants upright, allowing plants to get the sunlight and air they need?