Depends if the growing medium fully dried out. If it was bone dry all the way to the bottom, and the seed had already started growing underground, then yes, it is definitely dead. However it could still be alive and 10 days isn't long enough for a seed to germinate especially habs. I'd start some more to be safe, and give the ones you already have another week and see if they pop. If not, toss them and rely on your new ones. Good luck
Â