Through cell division, banana plants produce leaves that develop into a pseudostem and produce fruit. The bud forms in the bottom part of the plant and grows up through the centre of the pseudostem to the top. The arrow-shaped bud pushes through the top of the plant and its weight then causes it to change direction and grow towards the ground.
Bananas go through a unique process known as negative geotropism. Instead of continuing to grow towards the ground, they start to turn towards the sun. The fruit grows against gravity, giving the banana its familiar curved shape.
But why? The answer lies in the botanical history of the banana. It originated in the middle layer of the rainforest, where there is little sunlight. If the fruit were to grow towards the small amount of light that penetrates sideways through the vegetation, the plant could overbalance and topple over.
So bananas developed a way of growing towards the light without destabilising the plant.
A developing flower. A developing flower.
The flower grows towards the ground. The flower grows towards the ground.
The tiny banana fruits can already be seen under the leaves. The tiny banana fruits can already be seen under the leaves.
Beneath each petal is a row of banana fruits. Beneath each petal is a row of banana fruits.
The developing fruits. At this stage they are still growing downwards. The developing fruits. At this stage they are still growing downwards.
Negative geotropism comes into play and the bananas start to grow against gravity ... Negative geotropism comes into play and the bananas start to grow against gravity ...
... towards the sky. ... towards the sky.
And that’s why bananas are curved! And that’s why bananas are curved!
Btw I think bananas are nasty