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Nov
17
accepted How fast is water transported from roots to leaves?
Nov
17
awarded  Scholar
Nov
17
accepted How fast do stomata respond to environmental changes?
Nov
17
comment How fast is water transported from roots to leaves?
Great, thanks! That's about 1.5m/h in the light, and Castor plants get to a few meters, so I guess it might take a few hours to get from root tips to stomata.
Nov
13
comment How fast is water transported from roots to leaves?
Yeah, net water evaporation is going to be much less than xylem flow rates. I'm interested in xylem flow rates. In particular, I'm interested in the (distribution of) time it takes for a parcel of water to get from the roots to the leaves. Approximations are fine though (e.g. for a Sequoia - Minutes? Hours? Days?).
Nov
13
comment Do aquatic plants have stomata?
Are there aquatic angiosperms that never have their leaves out of water? Or at least, where the leaves don't really work out of water?
Nov
12
comment Do aquatic plants have stomata?
@fileunderwater: There are semi aquatic plants that ofter have their leaves above water. Those will have stomata. There are properly aquatic "plants", like kelp, but as Tanmath says, they're not embryophytes, so they don't have stomata.
Nov
11
comment How fast is water transported from roots to leaves?
@user137: True. But I don't know where to get that data for a whole single plant (of any size)
Nov
11
revised How fast is water transported from roots to leaves?
added 1 character in body
Nov
11
awarded  Editor
Nov
11
revised Are antihistamines considered to be psychoactive substances?
Clarify effects and references.
Nov
11
comment Do aquatic plants have stomata?
They're not in separate kingdoms. Algae and Land plants (embryophytes) are separate Divisions of the Kingdom Plantae.
Nov
11
awarded  Commentator
Nov
11
comment Are antihistamines considered to be psychoactive substances?
I fixed the two references, and removed the dictionary and yahoo answers link, because they didn't relate to antihistamines.
Nov
11
suggested approved edit on Are antihistamines considered to be psychoactive substances?
Nov
11
comment Are antihistamines considered to be psychoactive substances?
Your links list kind of broke. format them like [link name](http://...). Can you actually mention the effect in the question as well, so people know what you're talking about without going digging?
Nov
10
comment Are antihistamines considered to be psychoactive substances?
When you say "their impact on ones psyche functions", what effect(s) are you talking about?
Nov
10
asked How fast do stomata respond to environmental changes?
Nov
10
awarded  Citizen Patrol
Nov
10
comment How fast is water transported from roots to leaves?
Could someone please tag this "water" and "xylem" and then delete this comment?