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

Q: A bow wake is created when the wave source moves faster than the wave propagation speed.

A: What is created when the wave source moves faster than the wave propagation speed?
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Q: Present-day plants that have a complex vascular tissue system are called vasuluar plants.

A: Present-day plants that have a complex vascular tissue system are called what kind of plants?
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Q: The light reactions take place in the thylakoid.

A:
The light reactions take place in which membranes?
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