HOW CAN BANANA CURVED

There is a tendency in fruits and plants to grow in particular Direction towards the force of gravity. The growth towards the direction of gravity   is called 'positive geotropism' for example the growth of roots downwards is positive geotropism.   While developing on the plant bananas initially grow downward, but slowly change direction to curve upward, Opposite to the direction of gravity, in a process called negative geotropism. Why does this happen. It’s genetics the very first banana plants grew in rainforests where the canopies of the taller trees allow very little sunlight to penetrate to the lower levels. The scanty rays of the sun and developed a cured shape in the process..