system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If fruit get their nutrients to grow from the tree, how do they continue to grow or ripen after they are picked from the tree?
gpt
Fruits that continue to ripen as they are picked normally contain lots of starches that get converted into sugar like bananas.  Some fruits like tomatoes will ripen if the vine is cut and they are left on the vine as there are still some nutrients left.