It is there because hair is part of the body and connected to human health. Unhealthy hair is an indication of an internal proble. It indicates malnutrition, insufficience of important fatty lipids, and a well trained cosmetologist (hair dresser) can even recognize if you do drugs, or take medication for that matter. The hair and nails are like gages of health. Aside from that the puropse of most exercises is to get people to use the vocabulary. Thus a hair will appear in many contexts, i.e. in relation to food preparation, on clothes, etc. It is rare otherwise that we talk about a single strand of hair
It sounds to me as if she is running the 'mo' with the preceding 'i' and saying imo anraith, putting the emphasis on the anraith. It might be natural in her dialect but I don't know as I am not familiar with it.
ribe is hair, a bristle, or a strand, and can also be a blade of grass. I put "strand of hair" and it counted my answer as wrong, replacing 'single' hair the correct answer. I ask then, Why did it count my answer as wrong??? someone forgot to put the obvious translation or "ribe gruaige" when they created the course:
I would also be inclined to describe a single hair as "a strand of hair" but dictionary.com doesn't quite agree - it says "a tress of hair", (though "a thread or threadlike part of anything" might cover a single hair too).
Perhaps this indicates that "strand of hair" for a single hair is a particularly modern Irish usage.
Googling it I too see "a strand of hair" comes up quite often. But I think it must be regional, as that is not something that I ever hear where I live. We would always just say "a hair".
Strand is heard more for things like "a strand of cotton" or "the strands of the discussion".
I've listened to this many times over, and I swear she is saying "in" rather than "i". It's possible that the /m/ from "m'anraith" coming after "i", plus the /uh/ between "m'" and "anraith" is making it sound like there's an /n/. And I know there's no /n/, but still I hear it.
Your hypothesis is plausible. But I hear an 'm' sound rather than an 'n'. I've listened on each ear separately and I hear her saying imo anraith, with the emphasis on anraith, in both cases. She is running i with mo and making it sound like imo.
I have to agree - the only n i hear is the one in anraith. If there's a criticism to be made, it's the full articulation of mo before a word starting with a vowel, but, in my experience there's a lot more variation there in normal speech than the purists would have you believe.