.For an orange:
1. The outer skin in orange colour is skin or peel
Peel. Skin can work too.
2. The inner part of the orange for eating is flesh
Sure. It's also called pulp.
3. The crush of the flesh of the orange is pulp
Pulp is the inside of an orange (not seeds or skin), whether it's crushed or not. Some orange juices contain pieces of it so that juice contains pulp.
4. The little hard part on top of an orange is naval
No, it has nothing to do with ships. It's navel, like your bellybutton, because it looks kind of like one.
5. What do we call the thin part in cream colour attached to the skin which is not for eating?
6. What do we call the stripy stuff sticking on the surface of the flesh ?
What stripy stuff?
7. What do we call the long and thin strip attached with the naval going the way down inside the middle of an orange?
Student or Learner