Companion PDF worksheet for Edexcel IGCSE Biology Lecture 56 - Deforestation. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 4.18B - Understand the effects of deforestation, including leaching, soil erosion, disturbance of evapotranspiration and the carbon cycle, and the balance of atmospheric gases. Complete set of Chapter 6 Worksheets are available.

Companion PDF worksheet for Edexcel IGCSE Biology Lecture 54 - The Nitrogen Cycle. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 4.11B - Describe the stages in the nitrogen cycle, including the roles of nitrogen fixing bacteria, decomposers, nitrifying bacteria and denitrifying bacteria. Complete set of Chapter 6 Worksheets are available.

Complete set of PDF worksheets for Edexcel IGCSE Biology (4BI0) Chapter 6 - Ecology and the Environment. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. All questions are original. Eight worksheets included: 49 - Ecosystems 50 - Biodiversity 51 - Biotic and Abiotic Factors 52 - Feeding Relationships 53 - The Carbon Cycle 54 - The Nitrogen Cycle 55 - Pollution and Global Warming 56 - Deforestation

Companion PDF worksheet for Edexcel IGCSE Biology Lecture 52 - Feeding Relationships. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 4.6 - Understand the names given to different trophic levels, including producers, primary, secondary and tertiary consumers and decomposers. Specification Point 4.7 - Understand the concepts of food chains, food webs, pyramids of number, pyramids of biomass and pyramids of energy transfer. Specification Point 4.8 - Understand the transfer of substances and energy along a food chain. Specification Point 4.9 - Understand why only about 10% of energy is transferred from one trophic level to the next. Complete set of Chapter 6 Worksheets are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 4.3.1.8 - Antibiotics and painkillers. Specification Point 4.3.1.9 - Discovery and development of drugs. Complete set of Chapter 3 Lectures are available.

Complete set of concise, modern presentations for AQA GCSE Biology (8461) Chapter 2 - Organisation. Contains colour coded specification points with handmade vector graphics. Eight presentations included: 6 - Organisation 7 - Enzymes 8 - Digestion and Food Tests 9 - The Circulatory System 10 - Blood Vessels 11 - Coronary Heart Disease 12 - Health and Disease 13 - Plant Tissues

Companion PDF worksheet for Edexcel IGCSE Biology Lecture 50 - Biodiversity. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 4.3B - Understand the term biodiversity. Specification Point 4.4B - Practical: investigate the distribution of organisms in their habitats and measure biodiversity using quadrats. Complete set of Chapter 6 Worksheets are available.

Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 4.3B - Understand the term biodiversity. Specification Point 4.4B - Practical: investigate the distribution of organisms in their habitats and measure biodiversity using quadrats. Complete set of Chapter 6 Lessons are available.

Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 4.5 - Understand how abiotic and biotic factors affect the population size and distribution of organism. Complete set of Chapter 6 Lessons are available.

Companion PDF worksheet for Edexcel IGCSE Biology Lecture 51 - Biotic and Abiotic Factors. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 4.5 - Understand how abiotic and biotic factors affect the population size and distribution of organism. Complete set of Chapter 6 Worksheets are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 3.31 - Understand how random fertilization produces genetic variation of offspring. Specification Point 3.32 - Know that in human cells the diploid number of chromosomes is 46 and the haploid number is 23. Specification Point 3.33 - Understand that variation within a species can be genetic, environmental, or a combination of both. Specification Point 3.34 - Understand that mutation is a rare, random change in genetic material that can be inherited. Complete set of Chapter 5 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 1.1 - Understand how living organisms share certain characteristics. Complete set of Chapter 1 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 3.1.6 - ATP. Specification Point 3.1.7 - Water. Specification Point 3.1.8 - Inorganic ions. Complete set of Chapter 1 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 4.3.1.6 - Human defence systems. Specification Point 4.3.1.7 - Vaccination. Complete set of Chapter 3 Lectures are available.

Complete set of concise, modern presentations for AQA GCSE Biology (8461) Chapter 6 - Inheritance and Variation. Contains colour coded specification points with handmade vector graphics. Ten presentations included: 30 - DNA, Genes and Chromosomes 31 - DNA and Proteins 32 - Reproduction 33 - Genetics 34 - Variation and Evolution 35 - Selective Breeding 36 - GM and Cloning 37 - Speciation and Antibiotic Resistance 38 - Fossils and Extinctions 39 - Classification

Powerpoint lecture covering the following in a modern, concise format: Specification Point 4.6.4 - Classification of living organisms. Complete set of Chapter 6 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 4.6.3.5 - Fossils. Specification Point 4.6.3.6 - Extinction. Complete set of Chapter 6 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 4.6.2.4 - Genetic engineering. Specification Point 4.6.2.5 - Cloning. Complete set of Chapter 6 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 4.6.2.1 - Variation. Specification Point 4.6.2.2 - Evolution. Specification Point 4.6.3.1 - Theory of evolution. Complete set of Chapter 6 Lectures are available.