system
Given the following post, respond as if you're commenting on Reddit:
human
What causes the bend in a banana? Why don't they grow straight?
gpt
It's believed that Bananas grow out and then bend later due to negative geotropism (growing against gravity). They bend upwards after growing for a certain period of time. Here is a quote from the Banana growers council (it's a thing apparently...)

"Bananas start life very, very straight but as the bunch emerges from the top of the plant and the bracts roll back (bracts are the leathery purple things that separate the hands of bananas) and fall off, the bananas begin to spread out and turn upward.
They do this because bananas are negatively geo-tropic. This means that they grow away from the pull of gravity, as opposed to turning upward toward the sun.
Because the Cavendish bunch is quite large and hangs almost straight down, the bananas generally have an even bend in them all the way round the bunch.
However Ladyfinger bunches sit almost at right angles to the plant and the bananas on the top side of the bunch grow straight upward while the bananas on the bottom side twist right around. Though there is no difference in the fruit the twisted bananas from the bottom side of the bunch generally don't make it to market, which is one reason that Ladyfinger bananas are more expensive because not all the bunch can be marketed."