I saw this tree in front of my room with those branches, and I asked myself why they didn’t grow downward in the direction of gravity since that would be easy for them? And I came to the conclusion that they are seeking sunlight. Is there any research which explain how they can do that?
I found that this mechanism is called Gravitropism (Tree Branches grow against gravity, while roots grow into the soil in the direction of gravity) but I didn’t find a clear explanation.