Companion PDF worksheet for Edexcel IGCSE Biology Lecture 21 - Transport Mechanisms. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 2.51 - Understand why simple, unicellular organisms can rely on diffusion for movement of substances in and out of the cell. Specification Point 2.52 - Understand the need for a transport system in multicellular organisms. Specification Point 2.54 - Describe the role of xylem in transporting water and mineral ions from the roots to other parts of the plant. Specification Point 2.53 - Describe the role of phloem in transporting sucrose and amino acids between the leaves and other parts of the plant. Complete set of Chapter 3 Worksheets 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 1.1 - Understand the features of a drainage basin: source, watershed, channel network and mouth. Complete set of Chapter 1 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 4.2 - Understand informal employment: causes (economic development, rural-urban migration) and characteristics (advantages and disadvantages) in a named megacity. Complete set of Chapter 5 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 3.3.9.1 - Carboxylic acids and esters. Complete set of Chapter 8 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 3.3.12.1 - Condensation polymers. Specification Point 3.3.12.2 - Biodegradability and disposal of polymers. Complete set of Chapter 8 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 2.65 - Describe the structure of the heart and how it functions. Specification Point 2.66 - Explain how the heart rate changes during exercise and under the influence of adrenaline. Specification Point 2.67 -Understand how factors may increase the risk of developing coronary heart disease. Complete set of Chapter 3 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 2.51 - Understand why simple, unicellular organisms can rely on diffusion for movement of substances in and out of the cell. Specification Point 2.52 - Understand the need for a transport system in multicellular organisms. Specification Point 2.53 - Describe the role of phloem in transporting sucrose and amino acids between the leaves and other parts of the plant. Complete set of Chapter 3 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 2.94 - Understand the sources, roles and effects of the following hormones: adrenaline, insulin, testosterone, progesterone and oestrogen. Complete set of Chapter 4 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 3.35B - Understand how a change in DNA can affect the phenotype by altering the sequence of amino acids in a protein. Specification Point 3.36B - Understand how most genetic mutations have no effect on the phenotype, some have a small effect and rarely do they have a significant effect. Specification Point 3.37B - Understand that the incidence of mutations can be increased by exposure to ionising radiation (for example, gamma rays, x-rays and ultraviolet rays) and some chemical mutagens (for example, chemicals in tobacco). Complete set of Chapter 5 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 5.5 - Understand the role of yeast in the production of food including bread. Specification Point 5.6 - Practical: investigate the role of anaerobic respiration by yeast in different conditions. Specification Point 5.7 - Understand the role of bacteria (Lactobacillus) in the production of yoghurt. Specification Point 5.8 - Understand the use of an industrial fermenter and explain the need to provide suitable conditions in the fermenter, including aseptic precautions, nutrients, optimum temperature and pH, oxygenation and agitation, for the growth of microorganisms. Complete set of Chapter 7 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 3.4.3 - Genetic diversity can arise as a result of mutation or during meiosis. Complete set of Chapter 4 Lectures are available.

Complete set of concise, modern presentations for Edexcel IGCSE Chemistry (4CH1) Chapter 4 - Bonding. Contains colour coded specification points. Five presentations included: 16 - Group 1 Elements 17 - Group 7 Elements 18 - Atmospheric Gases 19 - Metals and the Reactivity Series 20 - The Uses of Metals

Powerpoint lecture covering the following in a modern, concise format: Specification Point 4.7 - Know that crude oil is a mixture of hydrocarbons. Specification Point 4.8 - Describe how the industrial process of fractional distillation separates crude oil into fractions. Specification Point 4.9 - Know the names and uses of the main fractions obtained from crude oil. Specification Point 4.10 - Know the trend in colour, boiling point and viscosity of the main fractions. Complete set of Chapter 7 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 2.9 - Know the approximate percentages by volume of the four most abundant gases in dry air. Specification Point 2.10 - Understand how to determine the percentage by volume of oxygen in air using experiments involving the reactions of metals and non-metals with air. Specification Point 2.11 - Describe the combustion of elements in oxygen, including magnesium, hydrogen and sulphur. Specification Point 2.12 - Describe the formation of carbon dioxide from the thermal decomposition of metal carbonates, including copper (II) carbonate. Specification Point 2.13 - Know that carbon dioxide is a greenhouse gas and that increasing amounts in the atmosphere may contribute to climate change. Specification Point 2.14 - Practical: determine the approximate percentage by volume of oxygen in air using a metal or a non-metal. Complete set of Chapter 4 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 1.25 - Know and use the relationship between momentum, mass and velocity. Specification Point 1.26 - Use the idea of momentum to explain safety features. Specification Point 1.27 - Use the conservation of momentum to calculate the mass, velocity or momentum of objects. Specification Point 1.28 - Use the relationship between force, change in momentum and time taken. Specification Point 1.29 - Demonstrate an understanding of Newton’s third law. Complete set of Chapter 1 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 2.4 - Know and use the relationship between power, current and voltage and apply the relationship to the selection of appropriate fuses. Specification Point 2.5 - Use the relationship between energy transferred, current, voltage and time. Specification Point 2.6 - Know the difference between mains electricity being alternating current (A.C.) and direct current (D.C.) being supplied by a cell or battery. Complete set of Chapter 2 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 2.22P - Identify common materials which are electrical conductors or insulators, including metals and plastics. Specification Point 2.23P - Practical: investigate how insulating materials can be charged by friction. Specification Point 2.24P - Explain how positive and negative electrostatic charges are produced on materials by the loss and gain of electrons. Specification Point 2.25P - Know that there are forces of attraction between unlike charges and forces of repulsion between like charges. Specification Point 2.26P - Explain electrostatic phenomena in terms of the movement of electrons. Specification Point 2.27P - Explain the potential dangers of electrostatic charges. Specification Point 2.28P - Explain some uses of electrostatic charges. Complete set of Chapter 2 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 3.7 - Use the relationship between frequency and wavelength in different contexts including sound waves and electromagnetic waves. Specification Point 3.8 - Explain why there is a change in the observed frequency and wavelength of a wave when its source is moving relative to an observer, and that this is known as the Doppler effect. Specification Point 3.10 - Know that light is part of a continuous electromagnetic spectrum that includes radio, microwave, infrared, visible, ultraviolet, x-ray and gamma ray radiations and that all these waves travel at the same speed in free space. Specification Point 3.11 - Know the order of the electromagnetic spectrum in terms of decreasing wavelength and increasing frequency, including the colours of the visible spectrum. Specification Point 3.12 - Explain some of the uses of electromagnetic radiations. Specification Point 3.13 - Explain the detrimental effects of excessive exposure of the human body to electromagnetic waves and describe simple protective measures against the risks. Complete set of Chapter 3 Lectures are available.

A useful resource for students to practice their knowledge and examination technique for future external assessments. This is for the following paper: 4BI1 - 2B These questions are completely original and have been designed from scratch. There has been no reuse of previous exam questions. Our mock paper follows the format of the true Edexcel IGCSE Biology 2B paper closely. The obligatory comprehension question is also included. A mark scheme is also attached. The paper covers the following specification points: • Topic 2c Biological molecules (including practical 2.9 and practical 2.14B) (2.7 – 2.14B) • Topic 2g Gas exchange (including practical 2.45B) (2.40B – 2.50) • Topic 2i Excretion (2.70 – 2.79B) • Topic 3b Inheritance (3.14 – 3.39) • Topic 4c Cycles within ecosystems (4.10 – 4.11B) • Topic 4d Human influences on the environment (4.12 – 4.18B) Disclaimer: This document was created by department heads with many years of experience teaching the Pearson Edexcel IGCSE Biology course. We cannot however guarantee that it is an accurate representation of upcoming examinations and students should not treat it as such. Please use this as an aid, alongside other methods of revision.