That symbol with the triangle is called a diode. This causes the direction of a current to flow in a direction indicated by the tip of the arrow.

Scenario:
A current passes through a resistor/load and then faces an reversed biased.
Did a current actually pass through the resistor, or not?
Assuming that the current attempts to flow from positive to the negative terminal.

For the purposes of the syllabus, we take it that current does not flow through a resistor as long as the circuit is not complete.

I mean, take for example, if you were to break a circuit containing a lamp in series, there will be no current flowing through the circuit - even through a lamp. This, however, does not mean that the circuit is not “live”.

Although the circuit has no current flowing through it for now, it is still at a potential. Supposing we touch the circuit, we will be electrocuted because now a complete circuit can be formed (through our body towards earth) and current will be formed.

So for this circuit, the current will not be able to run a complete path because it has to “turn back” the moment it meets the wrong end of the diode.