When a seed germinates, how does it knows which direction is up?
In: 90
The initial gut reaction is to say gravity… And for the most part on earth this is kind of correct, but it is not the whole story.
There is a good explanation from NASA on actual testing, it is partially gravity, it is partially light gradient, it is partially a nutrient gradient…
[From NASA ](https://youtu.be/9MfWARdoF-o)
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