06-10-2026, 11:56 AM
[center]![[Image: 53a0476199c263c8423ac2802ada47a8.jpg]](https://i127.fastpic.org/big/2026/0610/a8/53a0476199c263c8423ac2802ada47a8.jpg)
Biology Igcse Course Unit 20
Published 6/2026
MP4 | Video: h264, 1920x1080 | Audio: AAC, 44.1 KHz, 2 Ch
Language: English | Duration: 58m | Size: 1.26 GB
Human Influences on Ecosystems
What you'll learn
In this course students will learn exactly what they need to know for their Biology IGCSE exams. Students will learn about
1. Describe how humans have increased food production, limited to
(a) agricultural machinery to use larger areas of land and improve efficiency
(b) chemical fertilisers to improve yields
© insecticides to improve quality and yield
(d) herbicides to reduce competition with weeds
(e) selective breeding to improve production by crop plants and livestock
2. Describe the advantages and disadvantages of large-scale monocultures of crop plants
3. Describe the advantages and disadvantages of intensive livestock production
4. Describe biodiversity as the number of different species that live in an area[/center]
5. Describe the reasons for habitat destruction, including
(a) increased area for housing, crop plant production and livestock production
(b) extraction of natural resources
© freshwater and marine pollution
6. State that through altering food webs and food chains, humans can have a negative impact on habitats
7. Explain the undesirable effects of deforestation
18. Describe the effects of untreated sewage and excess fertiliser on aquatic ecosystems
19. Describe the effects of non-biodegradable plastics, in both aquatic and terrestrial ecosystems
20. Describe the sources and effects of pollution of the air by methane and carbon dioxide, limited to: the enhanced greenhouse effect and climate change
21. Explain the process of eutrophication of water, limited to
(a) increased availability of nitrate and other ions
(b) increased growth of producers
© increased decomposition after death of producers
(d) increased aerobic respiration by decomposers
(e) reduction in dissolved oxygen
(f) death of organisms requiring dissolved oxygen in water
22. Describe a sustainable resource as one which is produced as rapidly as it is removed from the environment so that it does not run out
23. State that some resources can be conserved and managed sustainably, limited to forests and fish stocks
24. Explain why organisms become endangered or extinct
25. Describe how endangered species can be conserved, limited to
(a) monitoring and protecting species and habitats
(b) education
© captive breeding programmes
(d) seed banks
26. Explain how forests can be conserved using: education, protected areas, quotas and replanting
27. Explain how fish stocks can be conserved
28. Describe the reasons for conservation programmes, limited to
(a) maintaining or increasing biodiversity
(b) reducing extinction
© protecting vulnerable ecosystems
(d) maintaining ecosystem functions
29. Describe the use of artificial insemination (AI) and in vitro fertilisation (IVF) in captive breeding programmes
30. Explain the risks to a species if its population size decreases, reducing genetic variation
Requirements
Access to a device to watch lessons - phone, tablet, or computer No textbook needed - everything is covered in the course
Description
This Biology course is structured specifically around the latest Cambridge IGCSE and GCE Biology syllabus, ensuring complete and accurate coverage of every objective students need to master for their examinations. Students preparing for AP Biology, IB Biology, or equivalent international curricula will also find this course highly valuable for building a thorough understanding of the theory component of their exams, as the core biological concepts covered are closely aligned across these specifications.
The course focuses onUnit 20: Human Influences on Ecosystems, a unit that is increasingly prominent across all exam papers and one where students who are properly prepared can score very highly. From food supply and habitat destruction to pollution and conservation - every syllabus objective is covered in full, with zero gaps.
Every syllabus objective is covered comprehensively, without overloading you with irrelevant material. The content is precise, focused, and directly aligned with what examiners expect - so you spend your time learning exactly what matters and nothing that does not. Throughout every lesson, real past paper questions are used to show you how this unit is examined, what a full-mark answer looks like, and the common mistakes that cost students marks every single year. You will know not just what to say, but how to say it - and equally importantly, what not to write.
The course builds strongexam technique alongside content knowledge, covering every question type across Papers 1, 2, 3 and 4 - from multiple choice and short answer to structured and extended response questions. Students leave this course knowing exactly how to approach any question on this unit regardless of how it is worded.
Every video lesson comes with adownloadable PDF resource that contains everything you need to know for that specific lesson - definitions, diagrams, key points and exam tips - all written and structured to match exactly what the syllabus requires. There is no need to open a textbook, search for revision guides, or look anything up online. Simply watch the lesson, download the PDF, study from it, and go straight to past papers. Everything you need is right here in one place.
This unit is entirely theory-based - there are no practical experiments associated with it. This means every minute of the course is focused purely on building the depth of knowledge, precise scientific language and exam technique needed to score full marks across all theory papers. Particular attention is given to the areas students find most challenging - including the detailed process of eutrophication, the effects of deforestation, the advantages and disadvantages of intensive food production, and the precise conservation methods examiners expect students to be able to discuss and evaluate at supplement level.
This course is ideal for students aiming for high achievement and A* grades in Biology examinations.
Who this course is for
IGCSE Biology Students Preparing for External Exams
Biology Igcse Course Unit 20
Published 6/2026
MP4 | Video: h264, 1920x1080 | Audio: AAC, 44.1 KHz, 2 Ch
Language: English | Duration: 58m | Size: 1.26 GB
Human Influences on Ecosystems
What you'll learn
In this course students will learn exactly what they need to know for their Biology IGCSE exams. Students will learn about
1. Describe how humans have increased food production, limited to
(a) agricultural machinery to use larger areas of land and improve efficiency
(b) chemical fertilisers to improve yields
© insecticides to improve quality and yield
(d) herbicides to reduce competition with weeds
(e) selective breeding to improve production by crop plants and livestock
2. Describe the advantages and disadvantages of large-scale monocultures of crop plants
3. Describe the advantages and disadvantages of intensive livestock production
4. Describe biodiversity as the number of different species that live in an area[/center]
5. Describe the reasons for habitat destruction, including
(a) increased area for housing, crop plant production and livestock production
(b) extraction of natural resources
© freshwater and marine pollution
6. State that through altering food webs and food chains, humans can have a negative impact on habitats
7. Explain the undesirable effects of deforestation
18. Describe the effects of untreated sewage and excess fertiliser on aquatic ecosystems
19. Describe the effects of non-biodegradable plastics, in both aquatic and terrestrial ecosystems
20. Describe the sources and effects of pollution of the air by methane and carbon dioxide, limited to: the enhanced greenhouse effect and climate change
21. Explain the process of eutrophication of water, limited to
(a) increased availability of nitrate and other ions
(b) increased growth of producers
© increased decomposition after death of producers
(d) increased aerobic respiration by decomposers
(e) reduction in dissolved oxygen
(f) death of organisms requiring dissolved oxygen in water
22. Describe a sustainable resource as one which is produced as rapidly as it is removed from the environment so that it does not run out
23. State that some resources can be conserved and managed sustainably, limited to forests and fish stocks
24. Explain why organisms become endangered or extinct
25. Describe how endangered species can be conserved, limited to
(a) monitoring and protecting species and habitats
(b) education
© captive breeding programmes
(d) seed banks
26. Explain how forests can be conserved using: education, protected areas, quotas and replanting
27. Explain how fish stocks can be conserved
28. Describe the reasons for conservation programmes, limited to
(a) maintaining or increasing biodiversity
(b) reducing extinction
© protecting vulnerable ecosystems
(d) maintaining ecosystem functions
29. Describe the use of artificial insemination (AI) and in vitro fertilisation (IVF) in captive breeding programmes
30. Explain the risks to a species if its population size decreases, reducing genetic variation
Requirements
Access to a device to watch lessons - phone, tablet, or computer No textbook needed - everything is covered in the course
Description
This Biology course is structured specifically around the latest Cambridge IGCSE and GCE Biology syllabus, ensuring complete and accurate coverage of every objective students need to master for their examinations. Students preparing for AP Biology, IB Biology, or equivalent international curricula will also find this course highly valuable for building a thorough understanding of the theory component of their exams, as the core biological concepts covered are closely aligned across these specifications.
The course focuses onUnit 20: Human Influences on Ecosystems, a unit that is increasingly prominent across all exam papers and one where students who are properly prepared can score very highly. From food supply and habitat destruction to pollution and conservation - every syllabus objective is covered in full, with zero gaps.
Every syllabus objective is covered comprehensively, without overloading you with irrelevant material. The content is precise, focused, and directly aligned with what examiners expect - so you spend your time learning exactly what matters and nothing that does not. Throughout every lesson, real past paper questions are used to show you how this unit is examined, what a full-mark answer looks like, and the common mistakes that cost students marks every single year. You will know not just what to say, but how to say it - and equally importantly, what not to write.
The course builds strongexam technique alongside content knowledge, covering every question type across Papers 1, 2, 3 and 4 - from multiple choice and short answer to structured and extended response questions. Students leave this course knowing exactly how to approach any question on this unit regardless of how it is worded.
Every video lesson comes with adownloadable PDF resource that contains everything you need to know for that specific lesson - definitions, diagrams, key points and exam tips - all written and structured to match exactly what the syllabus requires. There is no need to open a textbook, search for revision guides, or look anything up online. Simply watch the lesson, download the PDF, study from it, and go straight to past papers. Everything you need is right here in one place.
This unit is entirely theory-based - there are no practical experiments associated with it. This means every minute of the course is focused purely on building the depth of knowledge, precise scientific language and exam technique needed to score full marks across all theory papers. Particular attention is given to the areas students find most challenging - including the detailed process of eutrophication, the effects of deforestation, the advantages and disadvantages of intensive food production, and the precise conservation methods examiners expect students to be able to discuss and evaluate at supplement level.
This course is ideal for students aiming for high achievement and A* grades in Biology examinations.
Who this course is for
IGCSE Biology Students Preparing for External Exams
Code:
https://rapidgator.net/file/c2b50490270a8c8285575c5d63474414/Biology_IGCSE_Course_Unit_20.part2.rar.html
https://rapidgator.net/file/43ad26b2234428fae06c5cb3cf557fc0/Biology_IGCSE_Course_Unit_20.part1.rar.html
https://nitroflare.com/view/17B8C80AB3AE107/Biology_IGCSE_Course_Unit_20.part2.rar
https://nitroflare.com/view/DE382E01E36DF05/Biology_IGCSE_Course_Unit_20.part1.rar