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4 Jan 2026
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Understanding CCEA GCSE Unit 1 Biology: Photosynthesis Explained
M
Mia jones
@12383
1 / 5
Understanding Photosynthesis
Think of photosynthesis as nature's solar power system - plants trap light energy using chlorophyll and convert it into chemical energy like glucose. This endothermic process only happens when light is present, making plants the only organisms that can directly use sunlight as an energy source.
The photosynthesis equation might look intimidating, but it's quite simple: 6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂. Plants take in carbon dioxide and water, add sunlight, and produce glucose plus oxygen as a bonus for us!
Once plants make glucose, they're pretty clever about using it. They convert it to cellulose for strong cell walls, combine it with soil nitrogen to build proteins, use it for energy through respiration, or store it as starch for later. At night, this stored starch gets converted back to glucose and transported through the phloem to wherever the plant needs it most.
Key Point: Every bit of food on Earth ultimately depends on photosynthesis - even meat comes from animals that ate plants!
Proving Light is Essential
Scientists use brilliant experiments to prove what plants actually need for photosynthesis, and the light experiment is particularly clever. They destarch a plant by keeping it in darkness for 48 hours, then partially cover a leaf with aluminium foil before placing it in bright light.
The results are dramatic - when they test for starch using iodine, the covered parts stay yellow-brown (no starch), while the uncovered parts turn blue-black (starch present). This proves that light is absolutely essential for photosynthesis to occur.
Destarching is crucial because it ensures any starch found was made during the experiment, not before. Think of it as clearing the slate clean so you can see exactly what happens during your test period.
Testing for Chlorophyll and Carbon Dioxide
The chlorophyll experiment uses variegated leaves - those cool leaves that are part green and part white. After destarching and bright light exposure, only the green parts (containing chlorophyll) produce starch, proving that this green pigment is essential for photosynthesis.
Testing for carbon dioxide gets more complex but brilliantly demonstrates this gas's importance. Scientists create an airtight setup using plastic bags and sodium hydroxide solution, which absorbs CO₂ from around the leaf. The control uses distilled water to maintain normal conditions for comparison.
When they compare leaves with and without CO₂, the results are clear - no carbon dioxide means no photosynthesis. This experiment shows why plants literally depend on the CO₂ we breathe out!
Remember: Every photosynthesis experiment follows the same pattern - destarch, change one condition, provide light, then test for starch.
Oxygen Production and Starch Testing
The oxygen experiment is probably the most visually satisfying - you can actually see gas bubbles being produced by Canadian pondweed under bright light. As you move the lamp closer (increasing light intensity), more bubbles appear, proving that oxygen is a product of photosynthesis.
The starch test is your go-to method for proving photosynthesis has occurred. You'll boil the leaf to kill it, remove chlorophyll with ethanol, then add iodine solution. Blue-black colour means starch is present, confirming photosynthesis happened.
Why do we remove the green chlorophyll? Simple - it would mask the colour change from the iodine, making it impossible to see whether starch is actually there. It's like clearing away fog so you can see the road clearly.
Photosynthesis vs Respiration Balance
Plants are constantly juggling two processes - photosynthesis and respiration - and the balance between them changes throughout the day. Using bicarbonate indicator, scientists can track CO₂ levels: purple means less CO₂, red is normal, and yellow shows increased CO₂.
In bright light, photosynthesis dominates, using up CO₂ and turning the indicator purple. Cover the plant with foil, and only respiration occurs, producing CO₂ and turning the indicator yellow. Partial shading creates a perfect balance where both processes occur at equal rates.
The compensation point is fascinating - it's when photosynthesis and respiration rates are exactly equal, so there's no net exchange of gases with the atmosphere. This happens twice daily, at sunrise and sunset, as light levels change.
Think About It: At night, plants actually consume oxygen and release CO₂, just like animals do through respiration alone.
Daily Gas Exchange Patterns
Throughout a 24-hour cycle, plants show predictable patterns of gas exchange. At night, only respiration occurs, so plants take in oxygen and release carbon dioxide. As dawn breaks, photosynthesis begins while respiration continues, creating a complex balance.
By noon, photosynthesis reaches its maximum rate due to intense sunlight, while respiration continues steadily. The plant now takes in much more CO₂ than it releases, and produces more oxygen than it consumes. This is when plants are working hardest to feed themselves and supply our atmosphere with oxygen.
As sunset approaches, photosynthesis slows down due to decreasing light intensity until the second compensation point is reached. Then the cycle begins again, demonstrating the beautiful rhythm of plant life.
Leaf Structure for Maximum Efficiency
Leaves are perfectly designed for photosynthesis, with every feature serving a specific purpose. Their large, broad surface area maximises light absorption, while being thin ensures gases and light don't have far to travel. The moist, permeable surfaces encourage gas exchange through diffusion.
The upper epidermis is transparent with no chloroplasts, allowing light to pass through to the important bits below. The waxy cuticle prevents water loss while staying transparent, and the palisade mesophyll cells are packed with chloroplasts and positioned to catch maximum sunlight.
Chloroplasts contain the magical chlorophyll that gives plants their green colour and traps light energy. These are most concentrated in the palisade layer, where the serious business of photosynthesis happens most efficiently.
Amazing Fact: The irregular shape of spongy mesophyll cells creates air spaces that work like a internal highway system for gas movement.
Gas Exchange Through Stomata
The spongy mesophyll might have fewer chloroplasts, but it's crucial for gas exchange. Its irregular, loosely packed cells create intercellular spaces that allow CO₂ to flow in and oxygen to flow out efficiently. Think of it as the leaf's internal ventilation system.
Stomata (singular: stoma) are tiny pores controlled by guard cells that can open and close like microscopic mouths. Most stomata are located on the leaf's underside to prevent excessive water loss and avoid rainwater entering from above. Smart positioning!
Guard cells control stomatal opening through water pressure - when they're full of water, the stoma opens; when they lose water, it closes. This allows plants to balance their need for CO₂ with their need to conserve water, especially during hot, dry conditions.
Limiting Factors in Photosynthesis
The law of limiting factors states that photosynthesis rate is determined by whichever essential factor is in shortest supply. Light intensity, carbon dioxide concentration, temperature, and water availability all play crucial roles in determining how fast photosynthesis occurs.
Increasing light intensity boosts photosynthesis rate up to an optimum point, after which other factors become limiting. Carbon dioxide naturally occurs at only 0.04% in air, so adding more can dramatically increase plant growth - that's why greenhouse growers sometimes burn paraffin to release extra CO₂.
Temperature effects are particularly interesting - rates increase up to about 40°C, but above this, enzymes denature and photosynthesis rapidly decreases. Water shortage causes plants to droop and reduces photosynthesis to about half the normal rate.
Real-World Application: Understanding limiting factors helps farmers maximise crop yields by identifying which factor needs attention first.
Maximising Crop Production
Commercial growers use their understanding of photosynthesis to maximise profits by controlling environmental factors. Greenhouses make this much easier than open fields, allowing precise control over temperature, CO₂ levels, light intensity, fertiliser, and water availability.
Paraffin heaters serve a dual purpose - they increase both temperature and CO₂ levels simultaneously. Ventilators circulate air to ensure even distribution of heat and gases throughout the growing space.
The key to maximum profit is finding the perfect balance between increasing essential raw materials and the costs involved. There's no point spending more on improvements than the extra crop yield will earn - it's all about smart economics combined with plant science.
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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 CCEA GCSE Unit 1 Biology: Photosynthesis Explained
M
Mia jones
@12383
Ever wondered how plants make their own food and why they're absolutely crucial for all life on Earth? Photosynthesis is the amazing process where plants convert sunlight into chemical energy, producing the glucose they need to grow and releasing the... Show more
Understanding Photosynthesis
Think of photosynthesis as nature's solar power system - plants trap light energy using chlorophyll and convert it into chemical energy like glucose. This endothermic process only happens when light is present, making plants the only organisms that can directly use sunlight as an energy source.
The photosynthesis equation might look intimidating, but it's quite simple: 6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂. Plants take in carbon dioxide and water, add sunlight, and produce glucose plus oxygen as a bonus for us!
Once plants make glucose, they're pretty clever about using it. They convert it to cellulose for strong cell walls, combine it with soil nitrogen to build proteins, use it for energy through respiration, or store it as starch for later. At night, this stored starch gets converted back to glucose and transported through the phloem to wherever the plant needs it most.
Key Point: Every bit of food on Earth ultimately depends on photosynthesis - even meat comes from animals that ate plants!
Proving Light is Essential
Scientists use brilliant experiments to prove what plants actually need for photosynthesis, and the light experiment is particularly clever. They destarch a plant by keeping it in darkness for 48 hours, then partially cover a leaf with aluminium foil before placing it in bright light.
The results are dramatic - when they test for starch using iodine, the covered parts stay yellow-brown (no starch), while the uncovered parts turn blue-black (starch present). This proves that light is absolutely essential for photosynthesis to occur.
Destarching is crucial because it ensures any starch found was made during the experiment, not before. Think of it as clearing the slate clean so you can see exactly what happens during your test period.
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Testing for Chlorophyll and Carbon Dioxide
The chlorophyll experiment uses variegated leaves - those cool leaves that are part green and part white. After destarching and bright light exposure, only the green parts (containing chlorophyll) produce starch, proving that this green pigment is essential for photosynthesis.
Testing for carbon dioxide gets more complex but brilliantly demonstrates this gas's importance. Scientists create an airtight setup using plastic bags and sodium hydroxide solution, which absorbs CO₂ from around the leaf. The control uses distilled water to maintain normal conditions for comparison.
When they compare leaves with and without CO₂, the results are clear - no carbon dioxide means no photosynthesis. This experiment shows why plants literally depend on the CO₂ we breathe out!
Remember: Every photosynthesis experiment follows the same pattern - destarch, change one condition, provide light, then test for starch.
Oxygen Production and Starch Testing
The oxygen experiment is probably the most visually satisfying - you can actually see gas bubbles being produced by Canadian pondweed under bright light. As you move the lamp closer (increasing light intensity), more bubbles appear, proving that oxygen is a product of photosynthesis.
The starch test is your go-to method for proving photosynthesis has occurred. You'll boil the leaf to kill it, remove chlorophyll with ethanol, then add iodine solution. Blue-black colour means starch is present, confirming photosynthesis happened.
Why do we remove the green chlorophyll? Simple - it would mask the colour change from the iodine, making it impossible to see whether starch is actually there. It's like clearing away fog so you can see the road clearly.
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Photosynthesis vs Respiration Balance
Plants are constantly juggling two processes - photosynthesis and respiration - and the balance between them changes throughout the day. Using bicarbonate indicator, scientists can track CO₂ levels: purple means less CO₂, red is normal, and yellow shows increased CO₂.
In bright light, photosynthesis dominates, using up CO₂ and turning the indicator purple. Cover the plant with foil, and only respiration occurs, producing CO₂ and turning the indicator yellow. Partial shading creates a perfect balance where both processes occur at equal rates.
The compensation point is fascinating - it's when photosynthesis and respiration rates are exactly equal, so there's no net exchange of gases with the atmosphere. This happens twice daily, at sunrise and sunset, as light levels change.
Think About It: At night, plants actually consume oxygen and release CO₂, just like animals do through respiration alone.
Daily Gas Exchange Patterns
Throughout a 24-hour cycle, plants show predictable patterns of gas exchange. At night, only respiration occurs, so plants take in oxygen and release carbon dioxide. As dawn breaks, photosynthesis begins while respiration continues, creating a complex balance.
By noon, photosynthesis reaches its maximum rate due to intense sunlight, while respiration continues steadily. The plant now takes in much more CO₂ than it releases, and produces more oxygen than it consumes. This is when plants are working hardest to feed themselves and supply our atmosphere with oxygen.
As sunset approaches, photosynthesis slows down due to decreasing light intensity until the second compensation point is reached. Then the cycle begins again, demonstrating the beautiful rhythm of plant life.
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Leaf Structure for Maximum Efficiency
Leaves are perfectly designed for photosynthesis, with every feature serving a specific purpose. Their large, broad surface area maximises light absorption, while being thin ensures gases and light don't have far to travel. The moist, permeable surfaces encourage gas exchange through diffusion.
The upper epidermis is transparent with no chloroplasts, allowing light to pass through to the important bits below. The waxy cuticle prevents water loss while staying transparent, and the palisade mesophyll cells are packed with chloroplasts and positioned to catch maximum sunlight.
Chloroplasts contain the magical chlorophyll that gives plants their green colour and traps light energy. These are most concentrated in the palisade layer, where the serious business of photosynthesis happens most efficiently.
Amazing Fact: The irregular shape of spongy mesophyll cells creates air spaces that work like a internal highway system for gas movement.
Gas Exchange Through Stomata
The spongy mesophyll might have fewer chloroplasts, but it's crucial for gas exchange. Its irregular, loosely packed cells create intercellular spaces that allow CO₂ to flow in and oxygen to flow out efficiently. Think of it as the leaf's internal ventilation system.
Stomata (singular: stoma) are tiny pores controlled by guard cells that can open and close like microscopic mouths. Most stomata are located on the leaf's underside to prevent excessive water loss and avoid rainwater entering from above. Smart positioning!
Guard cells control stomatal opening through water pressure - when they're full of water, the stoma opens; when they lose water, it closes. This allows plants to balance their need for CO₂ with their need to conserve water, especially during hot, dry conditions.
Sign up to see the contentIt's free!
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Improve your grades
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Limiting Factors in Photosynthesis
The law of limiting factors states that photosynthesis rate is determined by whichever essential factor is in shortest supply. Light intensity, carbon dioxide concentration, temperature, and water availability all play crucial roles in determining how fast photosynthesis occurs.
Increasing light intensity boosts photosynthesis rate up to an optimum point, after which other factors become limiting. Carbon dioxide naturally occurs at only 0.04% in air, so adding more can dramatically increase plant growth - that's why greenhouse growers sometimes burn paraffin to release extra CO₂.
Temperature effects are particularly interesting - rates increase up to about 40°C, but above this, enzymes denature and photosynthesis rapidly decreases. Water shortage causes plants to droop and reduces photosynthesis to about half the normal rate.
Real-World Application: Understanding limiting factors helps farmers maximise crop yields by identifying which factor needs attention first.
Maximising Crop Production
Commercial growers use their understanding of photosynthesis to maximise profits by controlling environmental factors. Greenhouses make this much easier than open fields, allowing precise control over temperature, CO₂ levels, light intensity, fertiliser, and water availability.
Paraffin heaters serve a dual purpose - they increase both temperature and CO₂ levels simultaneously. Ventilators circulate air to ensure even distribution of heat and gases throughout the growing space.
The key to maximum profit is finding the perfect balance between increasing essential raw materials and the costs involved. There's no point spending more on improvements than the extra crop yield will earn - it's all about smart economics combined with plant science.
We thought you’d never ask...
What is the Knowunity AI companion?
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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 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