00:01
On this question, we're asked to speculate on why gravitropism is adaptive.
00:10
And remember, gravitropism is gross in response to gravity.
00:14
And if you think about it, plants respond to gravity in two different ways.
00:18
They grow away from it.
00:21
So they would grow up away from gravity.
00:27
And they might grow down toward gravity.
00:34
And they need to be able to do both.
00:35
Because in most plants, and obviously, they're exceptions.
00:38
The stem grows upward, and the roots grow downward...