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Updated 20 Feb 2026
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Xylem and Phloem Cells Explained
E
Ellie quinn
@ellie_quinn98
![Xylem and Phloem.
Xylem
- transports water from roots to leaf [roots is where water
is absorbed with nutrients] to maintain water pressure
-](/_next/image?url=https%3A%2F%2Fcontent-eu-central-1.knowunity.com%2FCONTENT%2FRJLNpbUktKNTCyMJDouU_image_page_1.webp&w=2048&q=75)
Xylem and Phloem: Plant Transport Systems
Think of xylem as your plant's water pipes - it's a one-way system that moves water and minerals from the roots up to the leaves. This creates what scientists call the transpiration stream, which keeps water pressure steady throughout the plant.
What makes xylem so efficient? It's basically a hollow tube made of dead cells with no organelles like mitochondria getting in the way. The walls are strengthened with lignin, a tough substance that prevents the tubes from collapsing under pressure.
Phloem is completely different - it's like the plant's food delivery service. Made of living cells, it transports glucose (sugar made during photosynthesis) both up and down the plant. Unlike xylem, phloem needs energy to work and isn't a continuous stream.
The key difference? Phloem has special structures called sieve plates at the ends of cells that control the flow of nutrients. These living cells share cytoplasm and work alongside companion cells to keep the transport system running smoothly.
Quick Tip: Remember "X for eXtreme strength" (xylem has lignin) and "P for Powered transport" (phloem needs energy)!
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This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
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The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
Xylem and Phloem Cells Explained
E
Ellie quinn
@ellie_quinn98
Plants need a transport system just like we need blood vessels - they use two special tube systems called xylem and phloem. These vascular tissues work together to move water, nutrients, and food around the plant, keeping every part alive... Show more
Xylem and Phloem: Plant Transport Systems
Think of xylem as your plant's water pipes - it's a one-way system that moves water and minerals from the roots up to the leaves. This creates what scientists call the transpiration stream, which keeps water pressure steady throughout the plant.
What makes xylem so efficient? It's basically a hollow tube made of dead cells with no organelles like mitochondria getting in the way. The walls are strengthened with lignin, a tough substance that prevents the tubes from collapsing under pressure.
Phloem is completely different - it's like the plant's food delivery service. Made of living cells, it transports glucose (sugar made during photosynthesis) both up and down the plant. Unlike xylem, phloem needs energy to work and isn't a continuous stream.
The key difference? Phloem has special structures called sieve plates at the ends of cells that control the flow of nutrients. These living cells share cytoplasm and work alongside companion cells to keep the transport system running smoothly.
Quick Tip: Remember "X for eXtreme strength" (xylem has lignin) and "P for Powered transport" (phloem needs energy)!
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
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You can download the app from Google Play Store and Apple App Store.
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Students love us — and so will you.
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The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
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Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
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David K
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Xander S
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This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
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This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
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Xander S
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Elisha
iOS user
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Paul T
iOS user