Biology practicals are crucial skills you'll need to master for... Show more
Biology839 views·Updated May 24, 2026·5 pagesComplete GCSE AQA Biology Paper 1 Practical Guide
J
Jacob@bleple
1 / 5
1
of 5
Using Microscopes
Microscopes are your gateway to seeing the invisible world of cells! The basic setup includes a stage with clips to hold your slide, three objective lenses (4x, 10x, and 40x), and an eyepiece lens with 10x magnification.
Here's the foolproof method: Start by placing your slide on the stage and securing it with clips. Always begin with the lowest magnification objective lens to get your bearings.
Lower the lens almost to the slide using the coarse focussing dial - but watch from the side to avoid crashes! Look through the eyepiece and slowly raise the lens until your cells come into focus, then use the fine focussing dial for crystal-clear detail.
Top Tip: Calculate total magnification by multiplying eyepiece magnification × objective lens magnification. So 10x eyepiece × 40x objective = 400x total!
2
of 5
Effects of Osmosis on Plant Tissue
Osmosis is water's natural tendency to move from weak to strong solutions through cell membranes. This potato experiment brilliantly demonstrates how cells respond to different environments.
You'll create three identical potato cylinders using a cork borer and scalpel (aim for 3cm length). Measure their initial length and mass carefully - accuracy matters here!
Place each cylinder in different solutions: distilled water, 0.25 sugar solution, and 0.5 sugar solution. After leaving them overnight, gently roll them on paper towels and remeasure. Calculate percentage change using the formula: (change ÷ original) × 100.
Key Insight: Potatoes gain mass in water (cells swell), lose mass in concentrated sugar (cells shrink), and stay unchanged when internal and external concentrations match perfectly.
3
of 5
Food Tests
Testing for carbohydrates, proteins, and lipids is like being a food detective! Start by grinding your sample with distilled water to create a paste, then filter it to remove chunks.
For starch, add orange iodine solution - it turns blue-black if starch is present. The sugar test uses Benedict's solution in hot water for five minutes, changing from blue (no sugar) through green and yellow to red (loads of sugar).
Protein testing involves Biuret solution, which stays blue without protein but turns lilac when protein's detected. For lipids, skip the filtering step and add ethanol plus water - the mixture turns cloudy white if fats are present.
Remember: Only the sugar test needs heating, and lipid samples shouldn't be filtered as fats stick to filter paper!
4
of 5
Effect of pH on Amylase
Amylase is the enzyme that chops starch into simple sugars, and pH dramatically affects how well it works. You'll use iodine drops on a spotting tile as your starch detector - blue-black means starch is still there.
Set up three test tubes: starch solution, amylase solution, and pH buffer solution. Warm them all in a 30°C water bath for 10 minutes, then combine and start timing immediately.
Every 30 seconds, test a drop with iodine until it stays orange (meaning all starch is gone). The reaction time tells you how efficiently the enzyme worked at that pH.
Accuracy Tip: Take samples more frequently than every 30 seconds for precise timing, and get multiple people to judge colour changes as they can be gradual.
5
of 5
Photosynthesis Investigation
This experiment reveals how light intensity affects photosynthesis rate using the inverse square law - as distance doubles, light intensity drops by a factor of four!
Place your boiling tube 10cm from an LED light (they don't produce heat like normal bulbs). Fill it with sodium hydrogen carbonate solution to provide carbon dioxide, then add pondweed with the cut end upwards.
Count oxygen bubbles produced per minute at different distances, repeating each measurement three times for reliability. You'll notice that doubling the distance quarters the bubble count - that's the inverse square law in action!
Pro Method: Use a funnel and measuring cylinder over the pondweed to measure actual gas volume rather than counting bubbles, which can vary dramatically in size.
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Biology839 views·Updated May 24, 2026·5 pagesComplete GCSE AQA Biology Paper 1 Practical Guide
J
Jacob@bleple
Biology practicals are crucial skills you'll need to master for your exams and coursework. These five key experiments cover everything from using microscopes to testing food samples and understanding how living organisms work.
1
of 5Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
Using Microscopes
Microscopes are your gateway to seeing the invisible world of cells! The basic setup includes a stage with clips to hold your slide, three objective lenses (4x, 10x, and 40x), and an eyepiece lens with 10x magnification.
Here's the foolproof method: Start by placing your slide on the stage and securing it with clips. Always begin with the lowest magnification objective lens to get your bearings.
Lower the lens almost to the slide using the coarse focussing dial - but watch from the side to avoid crashes! Look through the eyepiece and slowly raise the lens until your cells come into focus, then use the fine focussing dial for crystal-clear detail.
Top Tip: Calculate total magnification by multiplying eyepiece magnification × objective lens magnification. So 10x eyepiece × 40x objective = 400x total!
2
of 5Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
Effects of Osmosis on Plant Tissue
Osmosis is water's natural tendency to move from weak to strong solutions through cell membranes. This potato experiment brilliantly demonstrates how cells respond to different environments.
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Key Insight: Potatoes gain mass in water (cells swell), lose mass in concentrated sugar (cells shrink), and stay unchanged when internal and external concentrations match perfectly.
3
of 5Sign up to see the content. It's free!
- Access to all documents
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- Join milions of students
Food Tests
Testing for carbohydrates, proteins, and lipids is like being a food detective! Start by grinding your sample with distilled water to create a paste, then filter it to remove chunks.
For starch, add orange iodine solution - it turns blue-black if starch is present. The sugar test uses Benedict's solution in hot water for five minutes, changing from blue (no sugar) through green and yellow to red (loads of sugar).
Protein testing involves Biuret solution, which stays blue without protein but turns lilac when protein's detected. For lipids, skip the filtering step and add ethanol plus water - the mixture turns cloudy white if fats are present.
Remember: Only the sugar test needs heating, and lipid samples shouldn't be filtered as fats stick to filter paper!
4
of 5Sign up to see the content. It's free!
- Access to all documents
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Effect of pH on Amylase
Amylase is the enzyme that chops starch into simple sugars, and pH dramatically affects how well it works. You'll use iodine drops on a spotting tile as your starch detector - blue-black means starch is still there.
Set up three test tubes: starch solution, amylase solution, and pH buffer solution. Warm them all in a 30°C water bath for 10 minutes, then combine and start timing immediately.
Every 30 seconds, test a drop with iodine until it stays orange (meaning all starch is gone). The reaction time tells you how efficiently the enzyme worked at that pH.
Accuracy Tip: Take samples more frequently than every 30 seconds for precise timing, and get multiple people to judge colour changes as they can be gradual.
5
of 5Sign up to see the content. It's free!
- Access to all documents
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- Join milions of students
Photosynthesis Investigation
This experiment reveals how light intensity affects photosynthesis rate using the inverse square law - as distance doubles, light intensity drops by a factor of four!
Place your boiling tube 10cm from an LED light (they don't produce heat like normal bulbs). Fill it with sodium hydrogen carbonate solution to provide carbon dioxide, then add pondweed with the cut end upwards.
Count oxygen bubbles produced per minute at different distances, repeating each measurement three times for reliability. You'll notice that doubling the distance quarters the bubble count - that's the inverse square law in action!
Pro Method: Use a funnel and measuring cylinder over the pondweed to measure actual gas volume rather than counting bubbles, which can vary dramatically in size.
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.
Similar content
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