How a seed knows to grow up toward sunlight when it’s under a pile of dirt.

Question

How a seed knows to grow up toward sunlight when it’s under a pile of dirt.

In: Earth Science

Answer 1

Plants grow upwards because they’re trying to get to the light to begin photosynthesis, but mostly germinate underground where there’s little light to follow. And so, the plants actually use gravity to tell it which way is up. They will grow upwards even in complete darkness.

https://www.thenakedscientists.com/articles/questions/how-do-plants-grow-upwards#:~:text=Paul%20-%20Plants%20grow%20upwards%20because,there’s%20little%20light%20to%20follow.&text=So%2C%20they%20sink%20due%20to,which%20way%20gravity%20is%20acting.