In the henry experiments, current was produced in a coil by a

The answer is it is produced by static charges.  A current produces a magnetic field. A current appears only if there is relative motion between the loop and the magnet. The current thus created in the loop is called Induced (electromotive force): the work done per unit charge to produce the induced current

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.