Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
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Question: The ileocecal valve, a sphincter, is usually in a constricted state, but when motility in the ileum increases, this sphincter relaxes, allowing food residue to enter the first portion of large intestine.

Answer: The ileocecal valve, a sphincter, is usually in a constricted state, but when motility in the ileum increases, this sphincter relaxes, allowing food residue to enter the first portion of what?


Question: Stem basic plant structure facilitates dispersal of pollen and fruit by raising reproductive structures.

Answer: What basic plant structure facilitates dispersal of pollen and fruit by raising reproductive structures?


Question: No reaction happens when alkanes are mixed with oxygen at room temperature.

Answer:
What happens when alkanes are mixed with oxygen at room temperature?