Question

Movement of water from the roots to the leaves

A. is explained by the cohesion-tension theory


B. is explained by the pressure-flow theory


C. depends on the process of transpiration from the leaves


D. depends on the ability of water to form hydrogen bonds


E. A, C, and D, but not B

Answer 1

Okay - what do you have so far?

Answer 2

its either A or E

Answer 3

i think its A actually

Answer 4

Okay so - for it to be A, both C and D would also have to be false. Why do you say both of those choices are false as well?

Answer 5

well D is false because hydrogen bonds always have the same strength, right?

Answer 6

Hm I wouldn't say so (sometimes, a bond can be strong enough to completely pull a proton off another water molecule - but you don't see that happening with every bond) - but, in a given container of water, I think you're saying that the bonds wouldn't pull the water towards any one direction; in other words, they would all cancel out? What if there were a net pull towards one direction...for example, through transpiration (evaporation of the water off the leaf)? All of the water molecules would get "pulled" out of the leaf, causing the water molecules it was hydrogen bonded to to be pulled in that direction as well, causing the molecules behind that one to get pulled up, etc. etc.

Do you see what I'm getting at? I'll try to reword it if that was a bit unclear...

Answer 7

okay so E

Answer 8

Yep - nice job*!