Subjects
Careers
Maths
Chemistry
Biology
English Lang.
History
Energy transfers (a2 only)
Infection and response
Homeostasis and response
Responding to change (a2 only)
Cell biology
Organisms respond to changes in their internal and external environments (a-level only)
Biological molecules
Organisation
Substance exchange
The control of gene expression (a2 only)
Bioenergetics
Genetic information & variation
Inheritance, variation and evolution
Ecology
Cells
Show all topics
World war two & the holocaust
2o democracy and nazism: germany, 1918-1945
Medieval period: 1066 -1509
2m wars and welfare: britain in transition, 1906-1957
1l the quest for political stability: germany, 1871-1991
1f industrialisation and the people: britain, c1783-1885
Britain & the wider world: 1745 -1901
2d religious conflict and the church in england, c1529-c1570
The cold war
1c the tudors: england, 1485-1603
Inter-war germany
2n revolution and dictatorship: russia, 1917-1953
2s the making of modern britain, 1951-2007
World war one
Britain: 1509 -1745
Show all topics
385
•
4 Jul 2025
•
eva marshall
@evamarshall_
Photosynthesis: A Comprehensive Guide for GCSE Biology Students
Photosynthesis is... Show more
This page illustrates the relationship between photosynthesis, respiration, and gas exchange in plants under different conditions. It covers scenarios from nighttime to bright sunlight, demonstrating how the balance between photosynthesis and respiration affects carbon dioxide and oxygen levels.
The concept of the compensation point is introduced, showing when photosynthesis and respiration rates are equal, resulting in no net gas exchange. The page also touches on the use of hydrogen carbonate indicators to visually represent these processes.
Definition: Compensation point - The light intensity at which the rate of photosynthesis exactly matches the rate of respiration, resulting in no net gas exchange.
Highlight: In bright sunlight, photosynthesis rates are much higher than respiration rates, leading to net oxygen production and carbon dioxide consumption.
Example: The color change of hydrogen carbonate indicator from yellow to purple demonstrates the shift from respiration-dominated to photosynthesis-dominated conditions.
This page delves into the core of CCEA GCSE Biology photosynthesis questions, presenting both the word and chemical equations for photosynthesis. It emphasizes that photosynthesis is an endothermic reaction requiring energy input from sunlight.
The role of chlorophyll in trapping sunlight energy is explained, along with the primary reactants and products of photosynthesis. The page also discusses the various uses of glucose in plants, including energy storage as starch, use in respiration, and structural purposes.
Photosynthesis word equation: Water + Carbon Dioxide + Sunlight → Glucose + Oxygen
Photosynthesis chemical equation: 6H₂O + 6CO₂ + Sunlight → C₆H₁₂O₆ + 6O₂
Highlight: Glucose produced through photosynthesis serves multiple purposes in plants, including energy storage, respiration, growth, fruit production, and cell wall formation.
Vocabulary: Endothermic - A reaction that requires energy input, in this case, from sunlight.
The final page focuses on leaf anatomy and the practical aspect of testing for starch in leaves GCSE biology. It details the various parts of a leaf and their functions in facilitating photosynthesis, including the waxy cuticle, stomata, and different types of cells.
The page concludes with a step-by-step guide on how to test for the presence of starch in leaves, a key experiment in CCEA GCSE Biology food tests. This practical demonstration provides evidence for photosynthesis occurring in leaves.
Vocabulary:
Example: The iodine test for starch in leaves involves first destarching the plant, then exposing it to light, and finally testing for starch production. A color change from yellow-brown to blue-black indicates the presence of starch.
Highlight: The process of testing for starch includes killing the leaf, removing chlorophyll, and then applying iodine. This method is crucial for demonstrating that photosynthesis has occurred.
This page discusses the key factors that influence the rate of photosynthesis CCEA GCSE biology. It explains how light intensity, carbon dioxide concentration, and temperature affect photosynthetic rates in plants.
Light intensity and carbon dioxide concentration are shown to have a direct relationship with the rate of photosynthesis up to a certain point. As these factors increase, so does the rate of photosynthesis, until another factor becomes limiting. Temperature also plays a crucial role, with an initial increase boosting photosynthesis rates.
Highlight: High temperatures can reduce the rate of photosynthesis due to enzyme denaturation, stomata closure, and potential plant death.
Vocabulary: Limiting factor - The environmental factor that restricts the rate of a process when it is in short supply or exceeds the optimal level.
Example: If light intensity increases , the rate of photosynthesis increases as light is the limiting factor. However, if carbon dioxide concentration increases but doesn't result in increased photosynthesis, it indicates that light or temperature has become the new limiting factor.
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.
You can download the app from Google Play Store and Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
App Store
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
eva marshall
@evamarshall_
Photosynthesis: A Comprehensive Guide for GCSE Biology Students
Photosynthesis is a crucial process in plant physiology, converting light energy into chemical energy. This guide covers the rate of photosynthesis CCEA GCSE biology concepts, including factors affecting photosynthesis, the photosynthesis equation... Show more
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
This page illustrates the relationship between photosynthesis, respiration, and gas exchange in plants under different conditions. It covers scenarios from nighttime to bright sunlight, demonstrating how the balance between photosynthesis and respiration affects carbon dioxide and oxygen levels.
The concept of the compensation point is introduced, showing when photosynthesis and respiration rates are equal, resulting in no net gas exchange. The page also touches on the use of hydrogen carbonate indicators to visually represent these processes.
Definition: Compensation point - The light intensity at which the rate of photosynthesis exactly matches the rate of respiration, resulting in no net gas exchange.
Highlight: In bright sunlight, photosynthesis rates are much higher than respiration rates, leading to net oxygen production and carbon dioxide consumption.
Example: The color change of hydrogen carbonate indicator from yellow to purple demonstrates the shift from respiration-dominated to photosynthesis-dominated conditions.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
This page delves into the core of CCEA GCSE Biology photosynthesis questions, presenting both the word and chemical equations for photosynthesis. It emphasizes that photosynthesis is an endothermic reaction requiring energy input from sunlight.
The role of chlorophyll in trapping sunlight energy is explained, along with the primary reactants and products of photosynthesis. The page also discusses the various uses of glucose in plants, including energy storage as starch, use in respiration, and structural purposes.
Photosynthesis word equation: Water + Carbon Dioxide + Sunlight → Glucose + Oxygen
Photosynthesis chemical equation: 6H₂O + 6CO₂ + Sunlight → C₆H₁₂O₆ + 6O₂
Highlight: Glucose produced through photosynthesis serves multiple purposes in plants, including energy storage, respiration, growth, fruit production, and cell wall formation.
Vocabulary: Endothermic - A reaction that requires energy input, in this case, from sunlight.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
The final page focuses on leaf anatomy and the practical aspect of testing for starch in leaves GCSE biology. It details the various parts of a leaf and their functions in facilitating photosynthesis, including the waxy cuticle, stomata, and different types of cells.
The page concludes with a step-by-step guide on how to test for the presence of starch in leaves, a key experiment in CCEA GCSE Biology food tests. This practical demonstration provides evidence for photosynthesis occurring in leaves.
Vocabulary:
Example: The iodine test for starch in leaves involves first destarching the plant, then exposing it to light, and finally testing for starch production. A color change from yellow-brown to blue-black indicates the presence of starch.
Highlight: The process of testing for starch includes killing the leaf, removing chlorophyll, and then applying iodine. This method is crucial for demonstrating that photosynthesis has occurred.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
This page discusses the key factors that influence the rate of photosynthesis CCEA GCSE biology. It explains how light intensity, carbon dioxide concentration, and temperature affect photosynthetic rates in plants.
Light intensity and carbon dioxide concentration are shown to have a direct relationship with the rate of photosynthesis up to a certain point. As these factors increase, so does the rate of photosynthesis, until another factor becomes limiting. Temperature also plays a crucial role, with an initial increase boosting photosynthesis rates.
Highlight: High temperatures can reduce the rate of photosynthesis due to enzyme denaturation, stomata closure, and potential plant death.
Vocabulary: Limiting factor - The environmental factor that restricts the rate of a process when it is in short supply or exceeds the optimal level.
Example: If light intensity increases , the rate of photosynthesis increases as light is the limiting factor. However, if carbon dioxide concentration increases but doesn't result in increased photosynthesis, it indicates that light or temperature has become the new limiting factor.
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.
You can download the app from Google Play Store and Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
App Store
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
