Question of the Day - why is fruit round?

It isn't all round.  I know that,  of course I do - I'm not thick.  *Neither have I been living in a cupboard in John o' Groats since World War Two.  *Nor have I been living since birth in a hut in darkest Antarctica.  *Or on the Moon.  I wasn't raised by wolves in the wilds of Siberia.  *Or anywhere else where they don't have fruit.  I know about bananas and pears, and probably other non-round fruit that I can't quite think of at the moment,  and I am putting it out there before anyone starts.

However, the fact remains that most fruit is round.  Apples, oranges, grapefruit,  Sharon fruit, kiwi fruit (yes, oval I know, but basically that IS round), grapes (again, an elongated form of round, but still round-ish),  lemons (same), tomatoes (controversial), pomegranates, blueberries, strawberries (sort of round) - I could go on, but won't.

*I do realise - because I'm not thick, right? - that I've made mistakes slash errors with my nors ors and neithers.  But right now I have a life to live, a cup of tea to make, a biscuit to dunk, the toilet to go to, nails to file, nose hairs to pluck - and I cannot be arsed looking up the correct grammatical 'usages' or 'use', even, and so for the moment at least they must stay as they are.  Imperfect - like non-round fruit.

Tomorrow's question - linked.  Why are raspberries hollow?