system
Given the following post, respond as if you're commenting on Reddit:
human
What stops fruits & veg like tomatoes from cooking on the plant during hot days?

If I put a tomato in the oven at around 30 degress celsius for 10-12 hours, it will become somewhat mushy and the skin might separate from the insides. It will be cooking and never return to the state it was before I placed it in the oven.

Why doesn't the tomato cook on the plant during a hot day? and how is the tomato "normal" again when I check the plant later, on a cooler day?
gpt
Damage is done to the plant from the heat on hot days, the difference is that when the fruit is still on the plant it has the opportunity to repair itself. 

Just like you might not expect a severed human hand to heal a burn, neither will severed parts of many organisms.