system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: I was eating a clementine today. Some of the segments were extremely sweet, some were very watery and almost tasteless. What's going on here?
gpt
* Clementines are citrus fruits and can be classified as a hesperidium berry.

* Fruits are pretty much mature plant ovaries, divided into carpels.

The segments of hesperidium berries come from the carpels of the flower. When fertilized, the ovary matures and develops layers. These layers are the exocarp, or flavedo, the mesocarp, or albedo, and the endocarp.

Flavedo is the outer colored rind of a citrus fruit. Albedo is the whitish inner peel. The endocarp is the juicy part and is divided into segments in citrus fruits. In the endocarp are huge cells called pulp cells, which are really juice vesicles contain all the goodness of your clementine. Pulp cells are made out of multicellular hairs, which are called trichomes. The hairs fill up with water and that is a pulp cell.

The fructose(sugar) that is stored inside the pulp cell can be easily evenly distributed through its membrane to other pulp cells, inside the same segment. This is not so easy for distribution to other segments. The covering over a clementine segment is made of the same substance making up the mesocarp. Albedo is made up of cellulose, and fructose can not easily diffuse through cellulose; it is the same sturdy substance used to create the protective plant cell wall.

Although this is not the case many times, the concentration of fructose in citrus fruits can vary segment to segment, in your case it was enough for you to notice. This doesn't explain why there may be fructose imbalance, but why a fructose imbalance can stay imbalanced. It could be caused by many things, such as the pulp cells bursting in some segments.