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296
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17 Dec 2025
•
GCSE Biology Higher Triple: Paper 1 Required Practicals
E
Evie Summerfield
@eviesummerfield
1 / 3
Microscope Use and Culturing Microorganisms
Ever wondered how to get that perfect view under a microscope? Start with the lowest power objective lens (4x) and work your way up. The mirror reflects light through the stage, whilst the eyepiece lens (usually 10x magnification) combines with the objective lens to give you the total magnification.
Your technique matters loads here. Always lower the objective lens until it nearly touches the slide using the coarse focusing dial, then look through the eyepiece and slowly move away from the slide until the image comes into focus. Use the fine focusing dial for that crystal-clear view.
Culturing microorganisms requires proper sterile technique to avoid contamination. Heat your inoculating loop in a Bunsen burner flame, open agar plates near the flame to kill airborne bacteria, and always work with sterilised equipment. When testing antibiotic effectiveness, you'll measure the zone of inhibition (the clear area where bacteria can't grow) using πr².
Top Tip: Always place agar plates upside down in the incubator at 25°C to prevent moisture from dripping onto your bacterial colonies!
Osmosis Investigation and Food Tests
Osmosis experiments with potato cylinders show you exactly how water moves across cell membranes. Cut identical cylinders using a cork borer, measure their length and mass precisely, then place them in different concentrations of sugar solution overnight. The percentage change in length or mass tells you whether water moved in or out of the cells.
Food tests are brilliant for identifying what's actually in your grub. Each test has a specific colour change that confirms the presence of different nutrients. The starch test uses iodine solution, turning orange/brown to blue-black when starch is present.
For protein detection, add biuret solution to your food sample - it'll turn purple if proteins are there. Benedict's test for sugars needs heating in a water bath and changes from blue to brick red with reducing sugars. The lipids test involves shaking your sample with ethanol, then adding water - a white cloudy emulsion confirms fats are present.
Remember: Always filter your food solution first, except for the lipids test where you need those fat particles to create the emulsion!
Enzyme Activity and Photosynthesis Experiments
Amylase enzyme experiments show you how pH affects enzyme activity brilliantly. You'll track how quickly amylase breaks down starch by testing samples with iodine solution every 30 seconds. When the iodine stops turning blue-black, you know all the starch has been digested.
Set up multiple test tubes with different pH buffers and time how long it takes for the starch to completely disappear. This gives you proper data about optimal enzyme conditions. Taking samples every 10 seconds rather than 30 gives you more accurate results.
Photosynthesis investigations measure oxygen production at different light intensities. Position pondweed at various distances from an LED light source (LEDs don't produce much heat, so they won't mess up your results). Count the oxygen bubbles produced per minute, or better yet, collect the gas in an upturned measuring cylinder for more accurate volume measurements.
The inverse square law explains why light intensity decreases rapidly with distance - when you double the distance, light intensity becomes four times weaker. This relationship is crucial for understanding your photosynthesis results.
Pro Tip: Always let your pondweed acclimatise for 5 minutes before starting measurements, and take repeat readings to calculate a reliable mean!
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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
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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!
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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
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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
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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.
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
GCSE Biology Higher Triple: Paper 1 Required Practicals
E
Evie Summerfield
@eviesummerfield
Biology practicals are essential skills you'll need for your GCSEs and beyond. These experiments help you understand key concepts like cell structure, osmosis, enzyme activity and photosynthesis through hands-on investigation.
Microscope Use and Culturing Microorganisms
Ever wondered how to get that perfect view under a microscope? Start with the lowest power objective lens (4x) and work your way up. The mirror reflects light through the stage, whilst the eyepiece lens (usually 10x magnification) combines with the objective lens to give you the total magnification.
Your technique matters loads here. Always lower the objective lens until it nearly touches the slide using the coarse focusing dial, then look through the eyepiece and slowly move away from the slide until the image comes into focus. Use the fine focusing dial for that crystal-clear view.
Culturing microorganisms requires proper sterile technique to avoid contamination. Heat your inoculating loop in a Bunsen burner flame, open agar plates near the flame to kill airborne bacteria, and always work with sterilised equipment. When testing antibiotic effectiveness, you'll measure the zone of inhibition (the clear area where bacteria can't grow) using πr².
Top Tip: Always place agar plates upside down in the incubator at 25°C to prevent moisture from dripping onto your bacterial colonies!
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Osmosis Investigation and Food Tests
Osmosis experiments with potato cylinders show you exactly how water moves across cell membranes. Cut identical cylinders using a cork borer, measure their length and mass precisely, then place them in different concentrations of sugar solution overnight. The percentage change in length or mass tells you whether water moved in or out of the cells.
Food tests are brilliant for identifying what's actually in your grub. Each test has a specific colour change that confirms the presence of different nutrients. The starch test uses iodine solution, turning orange/brown to blue-black when starch is present.
For protein detection, add biuret solution to your food sample - it'll turn purple if proteins are there. Benedict's test for sugars needs heating in a water bath and changes from blue to brick red with reducing sugars. The lipids test involves shaking your sample with ethanol, then adding water - a white cloudy emulsion confirms fats are present.
Remember: Always filter your food solution first, except for the lipids test where you need those fat particles to create the emulsion!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
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Enzyme Activity and Photosynthesis Experiments
Amylase enzyme experiments show you how pH affects enzyme activity brilliantly. You'll track how quickly amylase breaks down starch by testing samples with iodine solution every 30 seconds. When the iodine stops turning blue-black, you know all the starch has been digested.
Set up multiple test tubes with different pH buffers and time how long it takes for the starch to completely disappear. This gives you proper data about optimal enzyme conditions. Taking samples every 10 seconds rather than 30 gives you more accurate results.
Photosynthesis investigations measure oxygen production at different light intensities. Position pondweed at various distances from an LED light source (LEDs don't produce much heat, so they won't mess up your results). Count the oxygen bubbles produced per minute, or better yet, collect the gas in an upturned measuring cylinder for more accurate volume measurements.
The inverse square law explains why light intensity decreases rapidly with distance - when you double the distance, light intensity becomes four times weaker. This relationship is crucial for understanding your photosynthesis results.
Pro Tip: Always let your pondweed acclimatise for 5 minutes before starting measurements, and take repeat readings to calculate a reliable mean!
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?
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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Students love us — and so will you.
4.9/5
App Store
4.8/5
Google Play
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