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Updated Mar 28, 2026
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National 5 Biology Study Mindmap
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Transport Systems in Plants and Animals
Transpiration is basically how plants move water from their roots up to their leaves, where it evaporates through tiny pores called stomata. Think of it like a plant's drinking and sweating system combined! Water enters through root hair cells by osmosis, travels up the xylem vessels (which are strengthened with lignin rings), and eventually evaporates from the leaves.
Guard cells act like bouncers at the stomata, controlling whether they're open or closed and therefore how much water the plant loses. High temperatures, wind, and large surface areas increase transpiration, whilst high humidity decreases it.
Plants have two main transport systems: xylem (dead tissue that carries water and minerals upwards) and phloem (living tissue with companion cells that transports sugars in both directions). The phloem contains sieve plates and tubes that allow sugar to move between cells.
Key Insight: Just like humans have blood vessels, plants have their own "plumbing system" - xylem and phloem work together to keep plants hydrated and fed.
Your circulatory system works similarly but uses three types of blood vessels. Arteries carry blood away from your heart with thick, muscular walls to handle high pressure. Veins bring blood back to your heart with thinner walls, valves to prevent backflow, and wider channels for lower pressure. Capillaries have walls just one cell thick, creating massive networks in your tissues for efficient material exchange.
Respiration and Energy Production
Respiration is how your cells unlock energy from glucose - it's happening in every cell right now as you read this! This enzyme-controlled process generates ATP, which is basically your body's energy currency.
Aerobic respiration (with oxygen) happens in two stages: glycolysis in the cytoplasm breaks glucose into pyruvate (making 2 ATP), then the main event occurs in the mitochondria, producing loads more ATP plus carbon dioxide and water as waste products.
When oxygen isn't available, cells switch to fermentation. In animals, this produces lactate and only 2 ATP (which is why you get muscle fatigue during intense exercise). In plants and yeast, fermentation creates ethanol and carbon dioxide - that's how bread rises and alcohol is made!
Remember: Aerobic respiration gives you way more energy (lots of ATP) than fermentation (just 2 ATP), which is why you can't sprint forever without getting tired.
Cell Structure and Transport
Every cell is like a busy factory with specific parts doing different jobs. The cell membrane controls what enters and exits, whilst the nucleus contains all your genetic information. Mitochondria are the powerhouses where respiration happens, and ribosomes are protein-making machines.
DNA is a double-stranded helix held together by complementary base pairs (Adenine with Thymine, Guanine with Cytosine). Sections called genes contain instructions for making specific proteins.
Three key transport processes move substances around cells. Diffusion moves molecules from high to low concentration (no energy needed). Osmosis is the same but specifically for water through a selectively permeable membrane. Active transport moves substances against the concentration gradient, which requires energy and special membrane proteins.
Top Tip: Think of diffusion like students leaving school - they naturally spread from crowded corridors to empty spaces without any effort needed.
Proteins are made when mRNA copies the genetic code from DNA in the nucleus and takes it to ribosomes for assembly. These proteins become enzymes (biological catalysts), hormones, antibodies, or structural components.
Cell Division, Control Systems, and Reproduction
Mitosis is how your body grows and repairs itself by creating identical diploid cells (46 chromosomes). During mitosis, chromosomes line up, spindle fibres pull chromatids apart, and the cytoplasm divides to form two identical cells.
Stem cells are special because they can both copy themselves and become specialised cell types. Embryonic stem cells can become any cell type, whilst tissue stem cells are more limited but less controversial.
Your nervous system works like an incredibly fast communication network. Receptors detect stimuli, sensory neurons send messages to your brain and spinal cord (CNS), interneurons process the information, and motor neurons tell effectors (muscles and glands) how to respond.
Brain Breakdown: Your cerebrum handles conscious thoughts and memory, your cerebellum controls balance, and your medulla manages vital functions like breathing and heart rate - all automatically!
Reproduction involves male and female gametes (sex cells with 23 chromosomes each). In humans, sperm from testes meets an egg in the oviduct. Variation in offspring comes in two types: discrete (distinct groups like blood type) caused by single genes, and continuous (ranges like height) caused by multiple genes working together.
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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.
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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
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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
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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
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Anna
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Best app on earth! no words because it’s too good
Thomas R
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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
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National 5 Biology Study Mindmap
A
abby
@aabby.reidd
Ever wondered how plants transport water from their roots to their leaves, or how your heart pumps blood around your body? This biology content covers the essential transport systems in both plants and animals, plus key processes like respiration, cell... Show more
Transport Systems in Plants and Animals
Transpiration is basically how plants move water from their roots up to their leaves, where it evaporates through tiny pores called stomata. Think of it like a plant's drinking and sweating system combined! Water enters through root hair cells by osmosis, travels up the xylem vessels (which are strengthened with lignin rings), and eventually evaporates from the leaves.
Guard cells act like bouncers at the stomata, controlling whether they're open or closed and therefore how much water the plant loses. High temperatures, wind, and large surface areas increase transpiration, whilst high humidity decreases it.
Plants have two main transport systems: xylem (dead tissue that carries water and minerals upwards) and phloem (living tissue with companion cells that transports sugars in both directions). The phloem contains sieve plates and tubes that allow sugar to move between cells.
Key Insight: Just like humans have blood vessels, plants have their own "plumbing system" - xylem and phloem work together to keep plants hydrated and fed.
Your circulatory system works similarly but uses three types of blood vessels. Arteries carry blood away from your heart with thick, muscular walls to handle high pressure. Veins bring blood back to your heart with thinner walls, valves to prevent backflow, and wider channels for lower pressure. Capillaries have walls just one cell thick, creating massive networks in your tissues for efficient material exchange.
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Respiration and Energy Production
Respiration is how your cells unlock energy from glucose - it's happening in every cell right now as you read this! This enzyme-controlled process generates ATP, which is basically your body's energy currency.
Aerobic respiration (with oxygen) happens in two stages: glycolysis in the cytoplasm breaks glucose into pyruvate (making 2 ATP), then the main event occurs in the mitochondria, producing loads more ATP plus carbon dioxide and water as waste products.
When oxygen isn't available, cells switch to fermentation. In animals, this produces lactate and only 2 ATP (which is why you get muscle fatigue during intense exercise). In plants and yeast, fermentation creates ethanol and carbon dioxide - that's how bread rises and alcohol is made!
Remember: Aerobic respiration gives you way more energy (lots of ATP) than fermentation (just 2 ATP), which is why you can't sprint forever without getting tired.
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Improve your grades
Join milions of students
Cell Structure and Transport
Every cell is like a busy factory with specific parts doing different jobs. The cell membrane controls what enters and exits, whilst the nucleus contains all your genetic information. Mitochondria are the powerhouses where respiration happens, and ribosomes are protein-making machines.
DNA is a double-stranded helix held together by complementary base pairs (Adenine with Thymine, Guanine with Cytosine). Sections called genes contain instructions for making specific proteins.
Three key transport processes move substances around cells. Diffusion moves molecules from high to low concentration (no energy needed). Osmosis is the same but specifically for water through a selectively permeable membrane. Active transport moves substances against the concentration gradient, which requires energy and special membrane proteins.
Top Tip: Think of diffusion like students leaving school - they naturally spread from crowded corridors to empty spaces without any effort needed.
Proteins are made when mRNA copies the genetic code from DNA in the nucleus and takes it to ribosomes for assembly. These proteins become enzymes (biological catalysts), hormones, antibodies, or structural components.
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Improve your grades
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Cell Division, Control Systems, and Reproduction
Mitosis is how your body grows and repairs itself by creating identical diploid cells (46 chromosomes). During mitosis, chromosomes line up, spindle fibres pull chromatids apart, and the cytoplasm divides to form two identical cells.
Stem cells are special because they can both copy themselves and become specialised cell types. Embryonic stem cells can become any cell type, whilst tissue stem cells are more limited but less controversial.
Your nervous system works like an incredibly fast communication network. Receptors detect stimuli, sensory neurons send messages to your brain and spinal cord (CNS), interneurons process the information, and motor neurons tell effectors (muscles and glands) how to respond.
Brain Breakdown: Your cerebrum handles conscious thoughts and memory, your cerebellum controls balance, and your medulla manages vital functions like breathing and heart rate - all automatically!
Reproduction involves male and female gametes (sex cells with 23 chromosomes each). In humans, sperm from testes meets an egg in the oviduct. Variation in offspring comes in two types: discrete (distinct groups like blood type) caused by single genes, and continuous (ranges like height) caused by multiple genes working together.
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.
Where can I download the Knowunity app?
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Is Knowunity really free of charge?
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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
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