The correct answer is that the diode is forward biased and conducting, according to my research. This is because the anode (or the positive side of the battery) has more power. It should allow the current to flow. However, if the polarities (or the charges) were reversed, it would be reverse biased and not conducting. When a battery is put in backwards, it simply doesn’t work - as many things do when they’re not used correctly.
This said, this could be wrong. The specific information needed is not easily available on the web, and for the uninitiated, makes little to no sense. When looking into this kind of a problem, it is better to go to an electrician or someone who knows what they’re doing.