Yeah, there were, but you could still argue that the cave plants still require a small amount of sun similar to real world moss, and if not it was probably a fungus or bacteria that can survive with no light.
This is what i assume the falmer would be mainly eating since they live in said enviorments. Meaning humans could potentially adapt to eat the same diet. Not even needing to use magic to farm as previously stated.
Had this on ps1! The fmvs were so over the top badass loved every second of it. still do.
https://youtu.be/QzKXAL5EL4o