Final answer:
When peeling a banana, the external part is the peel, and the internal part is the banana fruit; these terms describe their positions relative to each other.
Step-by-step explanation:
To answer the student's question: When you Peel the banana, you remove the exocarp, which is also part of the pericarp or the fruit's outer layers. The banana's peel could be described using the term external because it is the fruit's outer covering. Conversely, the banana itself, being the part that you eat, would be referred to as internal in relation to the peel. Therefore, the two directional terms that describe the peel and fruit respectively are external for the peel and internal for the fruit.