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 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).
No - an apple tree is a dicot.
an apple tree
No - an apple tree is a dicot.
On. Growing on the tree. The apples on the tree are almost ripe. I see one bright red apple on the tree. The apples on the tree are getting pecked by birds.
The apple is the seed pod of the apple tree, so it carries the seed.
No. An apple is the result of a fertilized apple tree flower. It is the seedcase of an apple tree. The fruit.