I think this sample will make it easier to understand the difference, although it maybe interchangeable as well.
"There is a banana also" [ There is also a banana.]
JANE: "I'm trying remember what my mother served for dessert, I just realised she gave us the ice cream after our lunch."
JOE: "Let me think....OH YEAH! THERE WAS ALSO A BANANA!" (maybe excited tone/excited remembering it)
JANE:" I prepared a fruit platter and it has grapes, apples, oranges..."
JOE: "Look! "THERE IS A BANANA TOO!" (maybe excited tone/could be his favourite fruit)
"there is a banana as well"
**This phrase maybe used by people who's not excited about it, but you just wanna say or share the information.
JANE: I prefer to eat fruits for my dessert.
JOE: There are lots of fruits in the kitchen, THERE'S BANANA AS WELL.
Hope this is helpful!
Have a great day!