Don't know bars from seedlings, but "I need seedling" does not seem to be
valid English to me.
It certainly needs an article (or possessive adjective), e.g. "I need a seedling."
"I need seedling" (the "correct" answer) is not correct English. It should be "I need a seedling" or "I need seedlings" or "I need some seedlings"
"I need a seedling" is accepted now. But "I need the seedling" is rejected. Of course, it should also be accepted as it is a perfectly valid and frequently used statement in the context of gardening.
Mche is also a bar...so why is this not in the vocabulary.
Report it. This is course is in beta, early beta at that. If something isn't right, a translation is missing, etc, report it.
I need a bar should be accepted. (I have reported this)
"I need a bar of soap" = Ninahitaji mche wa sabuni
Poor English grammar
kinda useless vocab in this lesson
I wrote "I need a seedling" and it was accepted as it should be.
The sound does not come through my phone for this app only.