Free Republic
Browse · Search
News/Activism
Topics · Post Article

To: allmendream
Chemotropism and be growing towards sources of nutrients. I would have to look it up.

Towards nutrients, including water. They are actually darn good at finding water. They will break through metal pipes just to get to water.

I would say you don't need to look it up, as it is fairly obvious. You understand it completely.

The problem I had with your response earlier is that you don't see turning towards the Sun the same as growing towards the Sun.

What causes a seed to actually sprout?

(Hint: again, it's not gravity)

140 posted on 12/03/2009 4:49:10 PM PST by UCANSEE2
[ Post Reply | Private Reply | To 132 | View Replies ]


To: UCANSEE2
Well of course gravity cannot give the signal for a seed to sprout, gravity is constant. Gravity determines the direction the plant will send its cotyledons by the mechanism I discussed, but it doesn't give the signal to sprout.

I imagine temperature and water might do the trick via chemical signals that activate transcription factors that transcribe genes to produce the proper protein signaling molecules to start the ball rolling; but I just say that as a former farmer and current molecular biologist who took botany a LOOOOONG time ago. ;)

144 posted on 12/03/2009 5:19:16 PM PST by allmendream (Wealth is EARNED not distributed, so how could it be RE-distributed?)
[ Post Reply | Private Reply | To 140 | View Replies ]

Free Republic
Browse · Search
News/Activism
Topics · Post Article


FreeRepublic, LLC, PO BOX 9771, FRESNO, CA 93794
FreeRepublic.com is powered by software copyright 2000-2008 John Robinson