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Molly Hutton
02/12/2025
Biology
distribution of organisms
107
•
2 Dec 2025
•
Understanding the Distribution of Organisms in Nature
Molly Hutton
@mollyhutton
1 / 10
N5 Biology: Life on Earth Overview
You're diving into one of the most practical parts of biology that explains the natural world around you. Life on Earth is the third unit in your N5 Biology course, covering everything from tiny ecosystems to massive evolutionary changes.
This unit connects directly to what you see outside - why moss grows on the north side of trees, why certain birds only appear in specific seasons, and how pollution affects local wildlife. The distribution of organisms is just one piece of this bigger puzzle.
Quick Tip: This topic is perfect for understanding your local environment and often appears in practical exam questions!
What Controls Where Organisms Live?
Here's the key idea that'll unlock everything: organisms are incredibly picky about where they live. They need the perfect combination of abiotic factors and biotic factors (living interactions) to thrive.
Think of it like choosing the perfect house - you'd want the right temperature, enough light, and friendly neighbours. Animals and plants make similar choices, but their "deal-breakers" might be soil pH or the presence of predators.
Biodiversity - the variety of different species in an area - depends entirely on these factors. Areas with ideal conditions become wildlife hotspots, whilst harsh environments support fewer species.
Remember: Organisms don't just survive anywhere - they actively seek out their ideal living conditions!
Abiotic Factors: The Non-Living Essentials
Abiotic factors are the non-living environmental conditions that make or break an organism's survival chances. The big four you need to know are light intensity, moisture, pH, and temperature.
Light intensity determines where plants can photosynthesise effectively - you'll never find sun-loving daisies thriving in deep forest shade. Moisture levels control everything from where fungi grow to which insects can complete their life cycles.
pH levels in soil drastically affect plant distribution - rhododendrons love acidic soil whilst clematis prefers alkaline conditions. Temperature acts like a biological thermostat, determining which species can function in different climates.
Exam Tip: You'll often need to explain how measuring these factors can have errors - like thermometers being affected by direct sunlight!
Biotic Factors: Living Interactions That Matter
Biotic factors involve the complex web of relationships between living organisms. These interactions often determine who survives and who doesn't in any ecosystem.
Competition for resources happens when organisms need the same things - think birds fighting over nesting sites or plants competing for sunlight. Predation creates a constant pressure where predators control prey populations, whilst disease can devastate entire species.
Food availability and grazing pressure also shape communities. Heavy grazing by rabbits creates short grasslands, whilst areas without grazers develop different plant communities entirely.
Real World Connection: Urban foxes show how biotic factors change - less natural predation but more competition for food scraps!
Measuring and Sampling: Getting the Data Right
Scientists use specific techniques to study organism distribution, and you'll need to understand both the methods and their limitations. Quadrats help measure plant populations and coverage in specific areas.
Pitfall traps catch ground-dwelling invertebrates, giving insights into animal communities. However, both methods have sources of error - quadrats might miss mobile organisms, whilst pitfall traps can be affected by weather conditions.
Representative sampling means collecting data from multiple locations to get accurate results. You can't just sample one corner of a field and assume it represents the entire area.
Paired-statement keys help identify unknown organisms by asking yes/no questions about their features. These keys are essential tools for biological surveys.
Practical Tip: Always consider what your sampling method might miss - and suggest improvements in exam answers!
Indicator Species: Nature's Environmental Monitors
Indicator species are like biological environmental monitors - their presence or absence tells us about environmental quality and pollution levels. They're incredibly useful because they respond predictably to environmental changes.
Lichen species indicate air quality - some types only grow in clean air, whilst others tolerate pollution. Freshwater invertebrates work similarly for water quality - mayfly larvae indicate clean water, whilst rat-tailed maggots suggest pollution.
These species save time and money compared to complex chemical testing. By identifying which indicator species are present, scientists can quickly assess ecosystem health.
Understanding factors that increase or decrease biodiversity helps predict how environmental changes affect entire communities. Pollution typically decreases biodiversity, whilst habitat restoration increases it.
Environmental Connection: Next time you see lichen on trees, you're looking at a natural air quality indicator!
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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
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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.
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 THE SCHOOLGPT. 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 THE SCHOOLGPT. 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
Understanding the Distribution of Organisms in Nature
Molly Hutton
@mollyhutton
Ever wondered why certain plants thrive in your garden whilst others struggle to survive? The distribution of organisms- where different species choose to live - depends on a fascinating mix of living and non-living factors that create the perfect... Show more
N5 Biology: Life on Earth Overview
You're diving into one of the most practical parts of biology that explains the natural world around you. Life on Earth is the third unit in your N5 Biology course, covering everything from tiny ecosystems to massive evolutionary changes.
This unit connects directly to what you see outside - why moss grows on the north side of trees, why certain birds only appear in specific seasons, and how pollution affects local wildlife. The distribution of organisms is just one piece of this bigger puzzle.
Quick Tip: This topic is perfect for understanding your local environment and often appears in practical exam questions!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
What Controls Where Organisms Live?
Here's the key idea that'll unlock everything: organisms are incredibly picky about where they live. They need the perfect combination of abiotic factors and biotic factors (living interactions) to thrive.
Think of it like choosing the perfect house - you'd want the right temperature, enough light, and friendly neighbours. Animals and plants make similar choices, but their "deal-breakers" might be soil pH or the presence of predators.
Biodiversity - the variety of different species in an area - depends entirely on these factors. Areas with ideal conditions become wildlife hotspots, whilst harsh environments support fewer species.
Remember: Organisms don't just survive anywhere - they actively seek out their ideal living conditions!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Abiotic Factors: The Non-Living Essentials
Abiotic factors are the non-living environmental conditions that make or break an organism's survival chances. The big four you need to know are light intensity, moisture, pH, and temperature.
Light intensity determines where plants can photosynthesise effectively - you'll never find sun-loving daisies thriving in deep forest shade. Moisture levels control everything from where fungi grow to which insects can complete their life cycles.
pH levels in soil drastically affect plant distribution - rhododendrons love acidic soil whilst clematis prefers alkaline conditions. Temperature acts like a biological thermostat, determining which species can function in different climates.
Exam Tip: You'll often need to explain how measuring these factors can have errors - like thermometers being affected by direct sunlight!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Biotic Factors: Living Interactions That Matter
Biotic factors involve the complex web of relationships between living organisms. These interactions often determine who survives and who doesn't in any ecosystem.
Competition for resources happens when organisms need the same things - think birds fighting over nesting sites or plants competing for sunlight. Predation creates a constant pressure where predators control prey populations, whilst disease can devastate entire species.
Food availability and grazing pressure also shape communities. Heavy grazing by rabbits creates short grasslands, whilst areas without grazers develop different plant communities entirely.
Real World Connection: Urban foxes show how biotic factors change - less natural predation but more competition for food scraps!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Measuring and Sampling: Getting the Data Right
Scientists use specific techniques to study organism distribution, and you'll need to understand both the methods and their limitations. Quadrats help measure plant populations and coverage in specific areas.
Pitfall traps catch ground-dwelling invertebrates, giving insights into animal communities. However, both methods have sources of error - quadrats might miss mobile organisms, whilst pitfall traps can be affected by weather conditions.
Representative sampling means collecting data from multiple locations to get accurate results. You can't just sample one corner of a field and assume it represents the entire area.
Paired-statement keys help identify unknown organisms by asking yes/no questions about their features. These keys are essential tools for biological surveys.
Practical Tip: Always consider what your sampling method might miss - and suggest improvements in exam answers!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Indicator Species: Nature's Environmental Monitors
Indicator species are like biological environmental monitors - their presence or absence tells us about environmental quality and pollution levels. They're incredibly useful because they respond predictably to environmental changes.
Lichen species indicate air quality - some types only grow in clean air, whilst others tolerate pollution. Freshwater invertebrates work similarly for water quality - mayfly larvae indicate clean water, whilst rat-tailed maggots suggest pollution.
These species save time and money compared to complex chemical testing. By identifying which indicator species are present, scientists can quickly assess ecosystem health.
Understanding factors that increase or decrease biodiversity helps predict how environmental changes affect entire communities. Pollution typically decreases biodiversity, whilst habitat restoration increases it.
Environmental Connection: Next time you see lichen on trees, you're looking at a natural air quality indicator!
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Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Sign up to see the contentIt's free!
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Sign up to see the contentIt's free!
Access to all documents
Improve your grades
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Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
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?
You can download the app from Google Play Store and Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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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 THE SCHOOLGPT. 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 THE SCHOOLGPT. 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