Transpiration and Cohesion-Tension Theory. Cohesion and adhesion in the transport of water in plants

This videos explains the factors affecting transpiration as well as explaining the cohesion-tension theory. This is in the mass transport in plants topic in A-level biology, mass transport of water in plants. Learn how the properties of water result in adhesion and cohesion on water molecules to create a continuous column of water moving up the xylem.
This is often a topic students find conceptually challenging, so hopefully, this video will help clarify and explain the key ideas.
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[@MissEstruchBiology]

Hey everyone, I really hope you find this video helpful😊 If you would like more help, daily quizzes and study tips then head over to follow me on Instagram @MissEstruchBiology instagram.com/missestruchbiology/?hl=en OR if you want to get your hands on some A-level NOTES READY MADE by me with key marking points, keywords, and essay links, make your way to missestruch.com/ (this will be available from July 2021 - Can't wait?? email [e-mail] to get your hands on a copy before then).

[@beracahumoru5199]

This is really helpful Miss ❤❤, I've got my paper 1 AS biology tomorrow

[@reece3231]

thank you! This topic is so poorly explained in the text book, they over complicate it massively.

[@MissEstruchBiology]

So glad it was easier to understand 😊😊 it can be a tough topic to get your head around!

[@mattdavis7291]

Best explanation of the theory I've found.

[@MissEstruchBiology]

Thank you! Glad you found it clear to follow😀

[@itzchriz8243]

fr

[@fareehashaheen605]

this was very useful, thank you! i had a lot of doubts about the tension and negative pressure parts of the theory, but this video helped clear them up. thanks again :)

[@MissEstruchBiology]

Thank you for the feedback Fareeha, I'm really glad that it has helped you. Let me know if there are any other topics you would like to see videos on to help.

[@user-dk4dh9ms2o]

Excellent break down! Thank you so much!

[@BakariHenryGideon]

Clear and straight forward explaination

[@Hollymchapman]

This video is fantastic, your explanations are amazing - thank you

[@MissEstruchBiology]

Thank you for your lovely comment. Really pleased to hear it was helpful and easy to understand.

[@rainsmush]

This so far was the best, to the point, simple explanation ever! thanks for your efforts and now I am really clear about the topic, The topic was covered in a glance

[@MissEstruchBiology]

Hello 👋🏻 Thank-you. Love that you found it so clear and easy to understand! Really hope you find the rest of my videos just as helpful 😊

[@tori_ndags7417]

this was over the top fantastic! thanks a lot Miss Estruch!!!!!

[@MissEstruchBiology]

Aww thank you! Really pleased you liked it and I hope it helps with your studies.

[@mani-jx7nb]

your videos are saving my life, thank you so much

[@MissEstruchBiology]

So pleased they are helping you 😊 Best of luck with your studies!

[@rolanddwaynealavarenbernad9688]

Thank you so much for the explanation, I am now gaining a complete understanding on this topic thanks a lot.

[@MissEstruchBiology]

So pleased it has helped you fully understand 😀

[@jiamjar3906]

Thank you so much for this! I'm only in year 9, but I wanted to find out more about cohesion tension when it was mentioned :)

[@MissEstruchBiology]

that's great you're so curious! I hope it made sense and you keep with your Biology into A-levels 😊

[@allisonbenjamin6020]

This was so helpful, thanks! Using it for a gen bio exam.

[@MissEstruchBiology]

Good luck for your exam!!! So glad you found it helpful 😊

[@adrianaboujaoude7686]

extremely useful, thanks a lot!

[@MissEstruchBiology]

You're welcome 😊 Glad it was useful

[@irem-so3jf]

Hi! Thank you for the well-explained video

[@harrydonna90677]

Thank you, this helped me a lot!!!

[@MissEstruchBiology]

Hello, that's great 😊 Really pleased it's helped you

[@bishingekume3974]

Thank u its excellent eplaination

[@mastersat3345]

thank you very very much, you've helped me understand everything coz I have to present this in class

[@MissEstruchBiology]

Glad it helped 😊 I hope your presentation goes well 🤞🤞🤞

[@ahmediftekhar345]

Hi! I was just wondering if u could make a separate video on apoplastic and symplastic pathways for water. Thanks

[@laine2005]

Excellent explanation of the theory 👏, This explanation will help us with our reseach project by a lot. Thank you❤

[@MissEstruchBiology]

You're welcome!!

[@noorulainsheraz8291]

This video saved me two hours of self studying, thank you!

[@MissEstruchBiology]

You're welcome! I hope it helped you better understand the topic ☺

[@ummmyumm9335]

helped a lot in clearing my basics ~love from India

[@MissEstruchBiology]

Glad it helped!😀

[@bluemacaroons]

you make it really fun 😭

[@ajtv6208]

Saving our lives for Biology thank you

[@MissEstruchBiology]

🤣🤣 amazing! Happy to be helping

[@makk9849]

Very neat presentation. Thank you

[@MissEstruchBiology]

Glad you liked it!

[@adailyfact]

What grade did you get in your exam?

[@fearless4206]

Awesome Explanation ♥️

[@MissEstruchBiology]

Thank you!!! So glad you think so

[@shannon8814]

so helpful!

[@MissEstruchBiology]

So glad! :D

[@Cosxmix]

you're doing gods work🙌

[@MissEstruchBiology]

I hope it helps with your studies

[@oliviaglanville8472]

When I was taught this we were taught how minerals are actively transported into the roots and because this lowers the water potential the water follows by osmosis. You didn't seem to mention this in the video so I was wondering if it is something I need to know or will be asked questions about. Thank you :)

[@MissEstruchBiology]

Hello, This comes up in the theory section of topic 2 when learning about osmosis and active transports. The focus in the mass transport in plants section (topic 3) in the specification isn't how water enters a plant, but instead how it is transported around a plant once it is already in the xylem.

[@minesiperera9335]

Thanks alot miss💗

[@MissEstruchBiology]

You're welcome 😊

[@royboy4170]

Are the factors affecting transpiration on the spec? Couldn't find it in the textbook thanks

[@ayesha1929]

This is gonna save me from not failing my exams thank you so much, very well explained 👏 😩

[@MissEstruchBiology]

I really hope so! So pleased it was helpful 😊

[@mangroves6083]

Very useful for me

[@MissEstruchBiology]

Thank you, glad it helped!

[@theguddashow5514]

Ma'am It was very benevolent

[@MissEstruchBiology]

Thank you, what an interesting compliment😄

[@abhishekhowtar8785]

Excellent.

[@MissEstruchBiology]

Many thanks!

[@abhishekhowtar8785]

@@MissEstruchBiologyThank you. I understand it completely.

[@abhishekhowtar8785]

@@MissEstruchBiology can you do a video about chapter Immunity ( As and a level)

[@MissEstruchBiology]

@@abhishekhowtar8785 hello, all the A-level theory videos are uploaded. The immunity videos is within the topic 2 playlist

[@imjuliakim]

thank you

[@MissEstruchBiology]

Hope it helped 😊

[@momiscreations1344]

I think you just carried my a-levels lol. Thanks so much!

[@MissEstruchBiology]

☺️☺️☺️ Awww thank you! I'm so pleased the videos have helped you.

[@adailyfact]

What grade did you end up getting?

[@chunkplunk]

just found this as a 5 marker at the end of a paper so this helped a lot

[@MissEstruchBiology]

amazing 🙌🙌

[@moonmoon-dh5jo]

i love you!!!! you are so good at explaining. but can I just ask, are capillarity and adhesion the same things?

[@MissEstruchBiology]

Thank you! So glad you liked it. They aren't the same. Adhesion is the sticking of the water molecules to the walls of the xylem, and this results in capillarity. Capillary action is the process of the water flowing the the xylem against gravity. Hope that helps.

[@noelle4145]

Hi, thanks for the video. I have an important question - do we need to know about the apoplastic snd symplastic pathway? My teacher gave us an exam Qs on this to do in class about the route of water through the plant and it mentions the casparian strip and the different pathways. She also showed us a video from kerboodle aswell so I was thinking it’s for Aqa.

[@MissEstruchBiology]

hey. no not for AQA (it was on old spec but not anymore)

[@noelle4145]

@@MissEstruchBiology ok thank you so much !

[@kadburys4802]

thank you for this video! i'm struggling to differentiate between positive and negative pressure though?

[@MissEstruchBiology]

negative pressure creates a pulling force and positive pressure creates a pushing force

[@adailyfact]

What grade did you end up getting?

[@3da106]

Thank you so much for the video. Is osmosis pulling the water up throughout the whole process or just towards the end?

[@MissEstruchBiology]

The pull and movement is due to pressure gradients mainly 😊

[@Safiya-ey8op]

U did not talk about root pressure in ur water movement up the xylem question at the end tho 😢

[@dslacie25]

your videos are really helpful but are impossible to navigate according to topics. have you considered organising them into playlists?

[@MissEstruchBiology]

Hello, They are organised into playlists and each playlist is in spec order. Have a look in the playlist tab for each of the separate topics (1-8)

[@iffy_x]

hi, in my textbook it says that root pressure is a result of the active pumping of mineral ions by the endodermal cells into the xylem to produce movement of water by osmosis, this has confused me with the explanation in your video, could you please clarify!

[@MissEstruchBiology]

Hello yes this is the same as I was saying. Active transport of minerals into the roots lowers the water potential so water then entered by osmosis and creates pressure pushing the liquid up the xylem

[@Maryam-vz6no]

Where exactly on the website are practice questions for this topic?

[@MissEstruchBiology]

ah sorry. This video is old and is referring to my old website. No longer subject based questions. now they are skill or unit based on the resources tab

[@Maryam-vz6no]

@@MissEstruchBiology it's ok ,but still this video helped a lot in building concepts so thank you so much!

[@mikkydeep]

i study in Class 7.....I liked the video...But I have doubt in understanding that why does the water from the soil move towards the root hair?? Because,the concentration of liquids and gases are more in the root hair than in the soil...So why does the low concentration water and minerals move towards root hairs,where their concentration is higher??

[@uwotm8770]

Hi miss, i have a few questions: what is the purpose of lignin? why is it important that the xylem cells are dead? what are the differences between transport in the xylem and phloem? thanks so much i love u

[@adailyfact]

What grade did you end up getting?

[@Mozzie7920]

Surely water molecules sticking to the sides will make it block some of the other water molecules moving up?, or is it good because it would increase pressure as the tube is now narrower?

[@MissEstruchBiology]

Hello, the hydrogen bonds are not strong enough to cause a blockage. As soon as the negative pressure from above (due to water evaporating) this upwards pull is stronger than the H bonds. So H bonds help prevent the water dropping down due to gravity, but don't block the xylem. Hope that helps :D

[@Mozzie7920]

@@MissEstruchBiology yes this helps, thanks

[@emmafive2647]

What’s the difference between positive and negative pressure Miss

[@MissEstruchBiology]

Hello, A very brief summary is... Positive = high pressure causing a push force Negative = low pressure causing a pull force. Hope that helps.😊

[@jeanmarcjreissati7698]

does an increase in water concentration lead to an increase in the water potential?

[@MissEstruchBiology]

yes it does 😁 Distilled water has a water potential of 0 which is the highest value you get.

[@bobbobman4112]

transpiration is cooooooooooooooooooooooooool

[@jamalsafeer7405]

god send

[@ngalepatience8720]

Thanks very much if not of u I would have failed

[@MissEstruchBiology]

you're so welcome!!

[@Rahul-ef2ou]

I hate prahanna ahilan, i was watching this wonderful video. Prash skipped the video and made me very angry. Plzz give him detention

[@MissEstruchBiology]

🤣🤣

[@Wojbes]

5:13 the example is really stupid the water is displaced so moves up the straw if adhesion worked like that the ocean water would just climb up the cliffs and flood England

[@luke8958]

Are you stupid?

[@jack_4925]

Bro that’s cap 🧢....... Illarity 🤣🤣🤣..................... Sorry 😪

[@jack_4925]

But seriously good vid 👍

[@MissEstruchBiology]

🙈😆

[@MissEstruchBiology]

thanks!

[@finianlacy8827]

Why are you teaching kids to do this? Really...why? Talk about NEGATIVE PRESSURE