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Organisms respond to changes in their internal and external environments (a-level only)
Biological molecules
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Britain & the wider world: 1745 -1901
1l the quest for political stability: germany, 1871-1991
The cold war
Inter-war germany
Medieval period: 1066 -1509
2d religious conflict and the church in england, c1529-c1570
2o democracy and nazism: germany, 1918-1945
1f industrialisation and the people: britain, c1783-1885
1c the tudors: england, 1485-1603
2m wars and welfare: britain in transition, 1906-1957
World war two & the holocaust
2n revolution and dictatorship: russia, 1917-1953
2s the making of modern britain, 1951-2007
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Biology
1 Dec 2025
127
4 pages
c.17 @c.17
The Thar Desert might seem like a barren wasteland, but it's actually packed with opportunities for economic growth... Show more
Ever wondered why people choose to live in one of the world's harshest environments? The Thar Desert stretches across northwest India and Pakistan, covering 200,000 km² - nearly the size of the entire UK!
What makes this desert special is that it's the most densely populated desert in the world. This isn't just coincidence - there are genuine opportunities for development here. Development measures how advanced an area is economically, socially, and technologically.
The desert's location near the tropics in Asia creates unique conditions that, whilst challenging, also offer potential for growth. Key activities include irrigation (artificial watering for crops), quarrying (extracting minerals), and moving beyond subsistence farming (growing just enough for your family's needs).
Quick Tip Remember that even harsh environments can offer development opportunities - it's all about finding the right resources and adapting to local conditions.
You might be surprised to learn that deserts are brilliant for renewable energy production! The Thar Desert is perfect for wind farms because hot air rises quickly, creating strong winds, and there aren't any tall buildings to block the airflow.
The Indian government is keen on developing wind and solar energy here because it provides clean, renewable power. With long, sunny days and consistent winds, the desert could become a major energy exporter to other countries.
Irrigation has revolutionised farming in the Thar Desert. Areas that were once scrubby wasteland now grow wheat, cotton, pulses, sesame, maize, and mustard. The Indira Gandhi Canal system carries water across the desert, transforming agriculture completely.
The desert also sits on vast oil and coal reserves, though extracting them is expensive. However, with growing concerns about climate change, the focus is shifting towards covering the desert with solar panels instead.
Key Point Deserts aren't just empty spaces - they're goldmines for renewable energy and can support thriving agriculture with the right irrigation systems.
Think all deserts are just endless sand dunes? Think again! A hot desert is defined as any area receiving less than 250mm of rainfall per year, and this aridity (dryness) shapes everything about desert life.
Most hot deserts are found in a belt around 30°N and 30°S latitude, away from coasts. This location isn't random - it's caused by global atmospheric circulation. Air that rises at the equator descends here, creating persistent high pressure that blocks clouds and rain.
The climate is extreme in every way. Scorching daytime temperatures can plummet below freezing at night during winter, all because there's no cloud cover to trap heat. This massive temperature swing is one of the desert's defining features.
Desert soils are typically sandy or stony with little organic matter. They're dry but absorb water quickly after rare rainfall. Evaporation draws salts to the surface, creating white powdery patches, and overall fertility is quite poor.
Remember The 30° latitude belt is crucial for understanding where hot deserts form - it's all about that descending air creating high pressure systems.
You'd be amazed at how much life thrives in hot deserts! Despite the hostile conditions, deserts support a surprising diversity of plants, animals, and birds - they've just had to get creative with survival strategies.
Plant adaptations are particularly clever. Vegetation stays low and sparse to conserve water and energy. Many desert plants have developed special features like waxy coatings, water storage tissues, or deep root systems to cope with the extreme dryness.
Animal adaptations are equally impressive. Many rodents are nocturnal, hiding in underground burrows during scorching days and only emerging during cooler nights. Snakes and lizards have waterproof skin and produce minimal urine to retain precious water.
Camels are the ultimate desert survivors - these 'ships of the desert' can go for days without water thanks to their incredible adaptations. From storing fat in their humps to having specially designed nostrils, they're perfectly built for desert life.
Nature's Lesson Desert organisms show us that with the right adaptations, life can flourish anywhere - even in the world's harshest environments.
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.
1
Smart Tools NEW
Transform this note into: ✓ 50+ Practice Questions ✓ Interactive Flashcards ✓ Full Mock Exam ✓ Essay Outlines
functions of the digestive system
BiologyDifferences between prokaryotic and eukaryotic cells, including structure, division of labor, and examples of each type. Also discusses viewing cells with compound light microscopes.
BiologyUnderstanding the composition and function of macromolecules in living organisms, including lipids, proteins, carbohydrates, and nucleic acids.
AP BiologyExplore the effectiveness of housing management strategies in Glasgow, focusing on the Gorbals Crown Street Regeneration and Dalmarnock Clyde Gateway Project. This summary covers urban change, renewal, planning, and the socio-economic impacts of these developments, highlighting improvements in community well-being, transport access, and environmental quality.
BiologyExplore the four key processes of coastal erosion: attrition, abrasion, solution (corrosion), and hydraulic action. This summary provides a clear understanding of how these mechanisms shape coastlines, including their effects on coastal landscapes and systems. Ideal for higher geography students preparing for exams.
BiologyExplore the key processes of erosion and weathering in this comprehensive overview. Understand the mechanisms of corrosion, biological, chemical, and mechanical weathering, as well as mass movement types like slumping and rock falls. This summary is essential for Year 9 Geography students studying coastal and river processes.
BiologyQuotes from every main character
English LiteratureApp 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
c.17
@c.17
The Thar Desert might seem like a barren wasteland, but it's actually packed with opportunities for economic growth and development. This massive desert spans across India and Pakistan, and despite being one of the world's harshest environments, it's also the... Show more
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Ever wondered why people choose to live in one of the world's harshest environments? The Thar Desert stretches across northwest India and Pakistan, covering 200,000 km² - nearly the size of the entire UK!
What makes this desert special is that it's the most densely populated desert in the world. This isn't just coincidence - there are genuine opportunities for development here. Development measures how advanced an area is economically, socially, and technologically.
The desert's location near the tropics in Asia creates unique conditions that, whilst challenging, also offer potential for growth. Key activities include irrigation (artificial watering for crops), quarrying (extracting minerals), and moving beyond subsistence farming (growing just enough for your family's needs).
Quick Tip: Remember that even harsh environments can offer development opportunities - it's all about finding the right resources and adapting to local conditions.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
You might be surprised to learn that deserts are brilliant for renewable energy production! The Thar Desert is perfect for wind farms because hot air rises quickly, creating strong winds, and there aren't any tall buildings to block the airflow.
The Indian government is keen on developing wind and solar energy here because it provides clean, renewable power. With long, sunny days and consistent winds, the desert could become a major energy exporter to other countries.
Irrigation has revolutionised farming in the Thar Desert. Areas that were once scrubby wasteland now grow wheat, cotton, pulses, sesame, maize, and mustard. The Indira Gandhi Canal system carries water across the desert, transforming agriculture completely.
The desert also sits on vast oil and coal reserves, though extracting them is expensive. However, with growing concerns about climate change, the focus is shifting towards covering the desert with solar panels instead.
Key Point: Deserts aren't just empty spaces - they're goldmines for renewable energy and can support thriving agriculture with the right irrigation systems.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Think all deserts are just endless sand dunes? Think again! A hot desert is defined as any area receiving less than 250mm of rainfall per year, and this aridity (dryness) shapes everything about desert life.
Most hot deserts are found in a belt around 30°N and 30°S latitude, away from coasts. This location isn't random - it's caused by global atmospheric circulation. Air that rises at the equator descends here, creating persistent high pressure that blocks clouds and rain.
The climate is extreme in every way. Scorching daytime temperatures can plummet below freezing at night during winter, all because there's no cloud cover to trap heat. This massive temperature swing is one of the desert's defining features.
Desert soils are typically sandy or stony with little organic matter. They're dry but absorb water quickly after rare rainfall. Evaporation draws salts to the surface, creating white powdery patches, and overall fertility is quite poor.
Remember: The 30° latitude belt is crucial for understanding where hot deserts form - it's all about that descending air creating high pressure systems.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
You'd be amazed at how much life thrives in hot deserts! Despite the hostile conditions, deserts support a surprising diversity of plants, animals, and birds - they've just had to get creative with survival strategies.
Plant adaptations are particularly clever. Vegetation stays low and sparse to conserve water and energy. Many desert plants have developed special features like waxy coatings, water storage tissues, or deep root systems to cope with the extreme dryness.
Animal adaptations are equally impressive. Many rodents are nocturnal, hiding in underground burrows during scorching days and only emerging during cooler nights. Snakes and lizards have waterproof skin and produce minimal urine to retain precious water.
Camels are the ultimate desert survivors - these 'ships of the desert' can go for days without water thanks to their incredible adaptations. From storing fat in their humps to having specially designed nostrils, they're perfectly built for desert life.
Nature's Lesson: Desert organisms show us that with the right adaptations, life can flourish anywhere - even in the world's harshest environments.
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.
1
Smart Tools NEW
Transform this note into: ✓ 50+ Practice Questions ✓ Interactive Flashcards ✓ Full Mock Exam ✓ Essay Outlines
functions of the digestive system
BiologyDifferences between prokaryotic and eukaryotic cells, including structure, division of labor, and examples of each type. Also discusses viewing cells with compound light microscopes.
BiologyUnderstanding the composition and function of macromolecules in living organisms, including lipids, proteins, carbohydrates, and nucleic acids.
AP BiologyExplore the effectiveness of housing management strategies in Glasgow, focusing on the Gorbals Crown Street Regeneration and Dalmarnock Clyde Gateway Project. This summary covers urban change, renewal, planning, and the socio-economic impacts of these developments, highlighting improvements in community well-being, transport access, and environmental quality.
BiologyExplore the four key processes of coastal erosion: attrition, abrasion, solution (corrosion), and hydraulic action. This summary provides a clear understanding of how these mechanisms shape coastlines, including their effects on coastal landscapes and systems. Ideal for higher geography students preparing for exams.
BiologyExplore the key processes of erosion and weathering in this comprehensive overview. Understand the mechanisms of corrosion, biological, chemical, and mechanical weathering, as well as mass movement types like slumping and rock falls. This summary is essential for Year 9 Geography students studying coastal and river processes.
BiologyQuotes from every main character
English LiteratureApp 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
Sociology