I have a question (not about homework). If most plants grow downward, why does the stem grow upward? Are they talking about the roots?
This is due to GRAVITROPISM. The roots respond with positive gravitropism which means that they grow in the direction that gravity is pulling. This ensures that they are growing towards the ground where they will find a place to take root and absorb water/nutrients. Stems respond with negative gravitropism which means they grow in the opposite direction that gravity is pulling. This ensures that the leaves that the stem is holding up will point towards where the sun is for photosynthesis.
Check out this time-lapse video of seed germination and gravitropism:
I have my science journal at my house right now because I FORGOT to give it back to you on friday.
Is that okay?
No problem. I was working on your grades this weekend. Thanks for checking in!
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