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

Input: Consider Input: Sporopollenin protects the pollen of seed plants and spores of seedless plants.

Output: What protects the pollen of seed plants and spores of seedless plants?


Input: Consider Input: Gastro-esophageal sphincter sphincter is located at the stomach end of the esophagus and opens to allow the bolus to enter the stomach.

Output: Which sphincter is located at the stomach end of the esophagus and opens to allow the bolus to enter the stomach?


Input: Consider Input: The tissue stiffens happens when turgid cells in a nonwoody tissue push against each other.


Output: What happens when turgid cells in a nonwoody tissue push against each other?