The difference is that working hypothesis is that your still working on it but the hypothesis that your not working on it.

For a hypothesis to be put forward as a scientific hypothesis, the scientific method requires that one can test it. A working hypothesis is a provisionally accepted hypothesis proposed for further research.

It is a working hypothesis but it may not be true therefore it should not be relied on.

Yes. A hypothesis describes what we expect to happen in an experiment. If we do the experiment and something different happens, then our hypothesis is "falsified", or demonstrated to be false.

In that case, we'll need to reconsider our hypothesis to determine how it was wrong. We can revise our hypothesis and then conduct a different experiment to test it.

It's easy to demonstrate that a hypothesis is incorrect, but it is impossible to prove that it is true.

stretching the affected cell walls