My Orange Tree

A few months ago, when my sister went on a business trip to Florida, she brought me home a small orange plant. This made me happy. I really like to keep house plants. I have a Fred Myers tea plant bonsai, the orange plant and a pot that has baby's tears and a variegated corn-sort grass plant. I have some fun taking care of the plants, watering them, doing a little pruning. You know, the simple joys of plant life. Anyway, the other day after breakfast I went to check if they needed water, and noticed something horribly wrong with the orange plant. This is a photo of it when I had first potted it:And Here is what it looks like now:
Besides the Growth, can you notice anything different? (by the way, the dead bonsai to the right is my brothers--It died because he thought that I was taking care of it and I thought that he was taking care of it...woops). The thing that is different is not the hole in the broad leaf... that was there when I took it out of the plastic bag. Here's another picture in case you haven't figured out the issue I had that fateful morning:
The Bottom Leaf Fell of! There is now just a stub were the leaf was. A Stub! That was a slightly disappointing development. I guess that is is alright though; it seems to be a healthy plant otherwise and in a year or two or three or nine it might fruit if I propagate or expose it to Bees...This going to be so sweet!