Yes, the areas of the plant that actively output or input sugars are controlled by hormone signalling. These inputs/outputs then affect phloem flow on the basis of differential pressure.
It's true that the water moves by osmosis, but since osmosis is simply a special case of diffusion, it is also correct to say that water moves by diffusion.
You are correct, the diffusion of water is also called osmosis, but it is still a form of diffusion. The important thing to remember is that it's moving by passive transport.
Sugar loading in the phloem of the source tissue requires energy. Sucrose is loaded against its chemical potential gradient with a carrier (Symport system with protons, H+). Later water enters passively, pressure increases, and movement of water and solutes occurs by pressure flow. Unloading in the source tissue is also required and energy could be also needed, depending on the type of sink (growing sink or storage sink).
Correct me if I'm wrong, I'm trying to understand this subject. 1. Water from xylem will move to phloem because of mass flow (water moves from sites of high concentration to sites of low concentration). 2. The movement of water from X to P will be made through selective membranes (Osmosis). 3. Because of sugar molecules in the P, the solution will move throughout the Phloem from sites of high concentration to sites of low concentration (Difussion).
Yes. You're correct so osmosis moves water from xylem to phloem and then pressure builds and osmotic pressure builds so everything goes down the tube to the sink so you're correct.
Thank you so much for this video you've explained it in a very simple way i was having problem in understanding this topic but it was so easy to understand it by this video really,its hundred times better than the book !
The phloem doesn't know; its flow is simply the result of pressure differential, moving from high pressure to low pressure. The pressure in the phloem is determined by the plant's active transport of sugars. At the source, the plant actively pumps sugar into the phloem, water from the xylem follows in, and a high pressure area is created. At the sink, the plant actively pulls sugar out of the phloem, water passively returns to the xylem, and a low pressure area is created.
Sir can you tell me please why sugar is actively transported into phloem.Jn leaf concentration of sugar is high and in phloem it's low .Then why active Transport ?why not passive?
How does the phloem know where to deliver the sugar/nutrients? Is it something to do with an area of low solute concentration that the phloem material is pushed to? as it can go to roots or flowers or fruit or shoots etc - how does it know where?
Because water potential is high in the Xylem. And water moves from higher water potential to lower water potential. So over here Xylem has higher water potential. And phloem has lower water potential.
why would the plant be using active transport to move from the phloem to the sugar sink as it's a movement from an area of high concentration to low concentration? why is it not passive as it's moving down a concentration gradient? somebody pls answer me!!
Oh my goodness! a tremendous video dude. Thanks Nevertheless Im experiencing situation with ur rss . Don’t know why Unable to subscribe to it. Is there anyone getting equivalent rss downside? Anybody who knows kindly respond. Thnkx WONDERFUL Post.thanks for share..more wait ..
wtf this is not a naruto movie OMG my bad guys i never give a fk about plants nor studies but just one thing(this guys is better than my teacher i give him that) BELIEVE IT
Wrong. Movement of water through selective membranes is called osmosis. Diffusion is the movement of any species from sites of high concentrations to sites of low concentrations, until the concs are the same. BTW if the diffusing species is water then diffusion and mass flow are the same.
Yes, the areas of the plant that actively output or input sugars are controlled by hormone signalling. These inputs/outputs then affect phloem flow on the basis of differential pressure.
👌👍
son im back after 9 years i got the water from the plant
It's true that the water moves by osmosis, but since osmosis is simply a special case of diffusion, it is also correct to say that water moves by diffusion.
Johnny Clore 😘😘😘😘
Both are came under passive transport know that's y we say clore sir
Absolutely incorrect mentioning that it is osmosis reinforces the fact that phloem have a thin cell membrane.
you're awesome, i understood the whole process, you're so much better than my teacher ^_^
Thank you, this explanation cleared every sort of confusion i had before. :)
Thanks man, this really cleared it up for me!
Best video I found on this!!!
You are correct, the diffusion of water is also called osmosis, but it is still a form of diffusion. The important thing to remember is that it's moving by passive transport.
Sugar loading in the phloem of the source tissue requires energy. Sucrose is loaded against its chemical potential gradient with a carrier (Symport system with protons, H+). Later water enters passively, pressure increases, and movement of water and solutes occurs by pressure flow. Unloading in the source tissue is also required and energy could be also needed, depending on the type of sink (growing sink or storage sink).
Correct me if I'm wrong, I'm trying to understand this subject.
1. Water from xylem will move to phloem because of mass flow (water moves from sites of high concentration to sites of low concentration).
2. The movement of water from X to P will be made through selective membranes (Osmosis).
3. Because of sugar molecules in the P, the solution will move throughout the Phloem from sites of high concentration to sites of low concentration (Difussion).
Yes. You're correct so osmosis moves water from xylem to phloem and then pressure builds and osmotic pressure builds so everything goes down the tube to the sink so you're correct.
Oh, cool thanks.
this is an awesome video and explanation. thank you so much! it cleared up a lot for me!
Thanks!this video helped me more understand this topic.
love it great video to show my class and simple to the idea......thank you
Awesome video 😍😍
Excellent video ❤️📷
Thank you so much for this video
you've explained it in a very simple way
i was having problem in understanding this topic but it was so easy to understand it by this video
really,its hundred times better than the book !
Thank you for this very simplified video!! :D
The phloem doesn't know; its flow is simply the result of pressure differential, moving from high pressure to low pressure. The pressure in the phloem is determined by the plant's active transport of sugars. At the source, the plant actively pumps sugar into the phloem, water from the xylem follows in, and a high pressure area is created. At the sink, the plant actively pulls sugar out of the phloem, water passively returns to the xylem, and a low pressure area is created.
Sir can you tell me please why sugar is actively transported into phloem.Jn leaf concentration of sugar is high and in phloem it's low .Then why active Transport ?why not passive?
i have the same confusion, why is it active transport, it should be passive as sugar is moving from an area of higher conc. to an area of lower conc.
thanks man very simply explained nice video
amazing explanation!
great, clear explanation!
Excellent explanation.
I noticed you said the water diffused into the phloem. It's also important to note that it's by the process of osmosis.
thnk u it has help me a lot to understnd the concept
simple and easy to understand
awsome
Thank you so much! This is a really good video.
Nice explanation👌👌
When are the apoplast and symplast pathway used? Which one is used to move water into the sink, or the source?
Great Explanation! Thankyou!
this is a great explanation! my only critique is that carrot leaves look nothing like that, its really incorrect
Thanks, this made it easy to understand :)
@EduardoMalheiro123 no a hypothesis is just something that can be subject to change if new information comes it is a hypothesis
How does the phloem know where to deliver the sugar/nutrients? Is it something to do with an area of low solute concentration that the phloem material is pushed to? as it can go to roots or flowers or fruit or shoots etc - how does it know where?
waw nice videocongrats
thank u sir for this video but how the sugar is actively transported from the source to the phloem and then from the phloem to the sink.
in a place where conc. of sugar is high, water conc. is low and vice versa...hence WATER is moving from high conc from the xylem to the phloem
thnkyou sir...! its very usefull...!!
Isn't the passive movement of water from the xylem into the phloem osmosis?
nice video, easy to understand
thanks....awesome explanation...
thanxx a lot ......it really helped a lot
Oh, is it a hormone that directs it?
Thanks from a 2020 student
Please make video on root pressure
Great video, cheers
Why doesn't the sugar move from the phloem to the xylem due to difference in potential?
I suppose the membrane is only permeable to water, therefore only osmosis is allowed?
+Christine Tao Thanks!
+Shreya G I may be wrong. don't trust me completely lol
Because water potential is high in the Xylem.
And water moves from higher water potential to lower water potential.
So over here Xylem has higher water potential. And phloem has lower water potential.
Presence of solute (e.g.sucrose) lowers the water potential.
Excellent!
is pressure flow the same of as Mass flow?
nice video!
why would the plant be using active transport to move from the phloem to the sugar sink as it's a movement from an area of high concentration to low concentration? why is it not passive as it's moving down a concentration gradient? somebody pls answer me!!
it’s not active, the active part is the loading and unloading
Thank U.
But u had to add the concept of companion cells of Phloem too.
Otherwise it's just perfect 👌
Yes ....absolutely right
Oh my goodness! a tremendous video dude. Thanks Nevertheless Im experiencing situation with ur rss . Don’t know why Unable to subscribe to it. Is there anyone getting equivalent rss downside? Anybody who knows kindly respond. Thnkx
WONDERFUL Post.thanks for share..more wait ..
thank you! this helped alot! :)
Movement of water from the xylem to phloem is called Osmosis, not diffusion.
wtf this is not a naruto movie OMG my bad guys i never give a fk about plants nor studies
but just one thing(this guys is better than my teacher i give him that) BELIEVE IT
@Swordsman0
osmosis is a type of diffusion so....
we can also call it water diffusion.=)
Note: This hypothesis has been granted a state of theory.
@anikixvi yes. and "bulk flow"
11 years ago😱😱
Wow.. right on time just before exam
thanks, maybe i wont miss this question on my final now
very nice.
thank you
Thank you!!!!!!!
thanks
THANK 🙌
THANK
good
bro ur mic sounds like a water boarded 5 year old thats on an airplane micro phone
fax
Good
nice
we seek permission to use material for educational purposes at University of Delhi www.vle.du.ac.in
Please feel free to use this video for educational purposes; that is its intent.
Rama Sisoda
tq sir....
Movement of water is called osmosis not diffusion
Wrong. Movement of water through selective membranes is called osmosis. Diffusion is the movement of any species from sites of high concentrations to sites of low concentrations, until the concs are the same. BTW if the diffusing species is water then diffusion and mass flow are the same.
so Stalin in that situation he could of called it either osmosis or diffusion?
Gd video
I hope to never take bio again :@
Vdo is good but sound quality is comparetively bad👆
not goot
Best video I found on this!!!
thanks
THANK 🙌
THANK