No. It is a noun.
no
You could consider only tree a noun. Or apple as well, since it is used as a noun adjunct, not technically an adjective. You could also consider "apple tree" to be a compound noun.
because it is an apple tree
The apple blossom grows on an apple tree. The apple tree grows when you plant an apple seed.
tree apple
an apple tree
No - an apple tree is a dicot.
No - an apple tree is a dicot.
Tree is and adjective
In that sentence,, the word "green" is functioning as an adjective, describing the noun "apple" as a predicate adjective (subject complement) following the linking verb "is" (apple = green).
"I see an apple on the tree" is the correct phrase to use, as it indicates that the apple is physically located on the tree.
The apple is the seed pod of the apple tree, so it carries the seed.