headlight alarm circuit

Found this circuit on the internet.. It is intended to be a headlight alarm
(warning) to prevent one from leaving lights on by mistake.

http://www.eed.usv.ro/misc/mirrors/cc/circuit.htm/0122.htm

My question is, what is the resistor for ? do you need it and do you need
the diode from the ign aux line? Can't we wire the negative from the buzzer
straight to ign circuit minus the resistor to ground and diode?

Help me undrstand the purpose of the added parts.

Thanks

CM


.

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