Designed for the new specification IGCSE Edexcel course but can be used for other examination boards. Covers: (b) Feeding relationships 4.6  understand the names given to different trophic levels, including producers, primary, secondary and tertiary consumers and decomposers 4.7  understand the concepts of food chains, food webs, pyramids of number, pyramids of biomass and pyramids of energy transfer 4.8  understand the transfer of substances and energy along a food chain 4.9  understand why only about 10% of energy is transferred from one trophic level to the next

Designed for the new specification AQA GCSE course but can be modified for other exam boards. 29 slides covering Photosynthesis By the end of the powerpoint students would have covered: 4.4.1.1 Photosynthetic reaction Photosynthesis is represented by the equation: carbon dioxide + water light glucose + oxygen Students should recognise the chemical symbols: CO2, H2O, O2 and C6H12O6. Students should be able to describe photosynthesis as an endothermic reaction in which energy is transferred from the environment to the chloroplasts by light. 4.4.1.2 Rate of photosynthesis Students should be able to explain the effects of temperature, light intensity, carbon dioxide concentration, and the amount of chlorophyll on the rate of photosynthesis. Students should be able to: measure and calculate rates of photosynthesis extract and interpret graphs of photosynthesis rate involving one limiting factor plot and draw appropriate graphs selecting appropriate scale for axes translate information between graphical and numeric form. (HT only) These factors interact and any one of them may be the factor that limits photosynthesis. (HT only) Students should be able to explain graphs of photosynthesis rate involving two or three factors and decide which is the limiting factor. (HT only) Students should understand and use inverse proportion – the inverse square law and light intensity in the context of photosynthesis. (HT only) Limiting factors are important in the economics of enhancing the conditions in greenhouses to gain the maximum rate of photosynthesis while still maintaining profit. **Required practical activity 6: investigate the effect of light intensity on the rate of photosynthesis using an aquatic organism such as pondweed. ** 4.4.1.3 Uses of glucose from photosynthesis The glucose produced in photosynthesis may be: used for respiration converted into insoluble starch for storage used to produce fat or oil for storage used to produce cellulose, which strengthens the cell wall used to produce amino acids for protein synthesis. To produce proteins, plants also use nitrate ions that are absorbed from the

Designed for the new specification AQA GCSE( covers spec point 4.7.3.1 ) course but can be modified for other exam boards. 12 slides covering the following objectives: Define biodiversity Describe why biodiversity is important Explain how waste, deforestation and global warming have an impact on biodiversity. **“There is a different starter for combined or Triple students” **

Designed for the new specification AQA GCSE course but can be modified for other exam boards. 17 slides covering Metabolism. By the end of the powerpoint students would have covered: 4.4.2.3 Metabolism Students should be able to explain the importance of sugars, amino acids, fatty acids and glycerol in the synthesis and breakdown of carbohydrates, proteins and lipids. Metabolism is the sum of all the reactions in a cell or the body. The energy transferred by respiration in cells is used by the organism for the continual enzyme controlled processes of metabolism that synthesise new molecules. Metabolism includes: conversion of glucose to starch, glycogen and cellulose the formation of lipid molecules from a molecule of glycerol and three molecules of fatty acids the use of glucose and nitrate ions to form amino acids which in turn are used to synthesise proteins respiration breakdown of excess proteins to form urea for excretion.

Designed for the new specification AQA GCSE course but can be modified for other exam boards. 21 slides covering The nervous system By the end of the powerpoint students would have covered: 4.5.2.1 Structure and function Students should be able to explain how the structure of the nervous system is adapted to its functions. The nervous system enables humans to react to their surroundings and to coordinate their behaviour. Information from receptors passes along cells (neurones) as electrical impulses to the central nervous system (CNS). The CNS is the brain and spinal cord. The CNS coordinates the response of effectors which may be muscles contracting or glands secreting hormones. stimulus --> receptor --> coordinator -->effector -->response Students should be able to explain how the various structures in a reflex arc – including the sensory neurone, synapse, relay neurone and motor neurone – relate to their function. Students should understand why reflex actions are important. Reflex actions are automatic and rapid; they do not involve the conscious part of the brain. Required practical activity 7: plan and carry out an investigation into the effect of a factor on human reaction time.

Designed for the new specification IGCSE Edexcel course but can be used for other examination boards. Covers: (d) Movement of substances into and out of cells 2.15 understand the processes of diffusion, osmosis and active transport by which substances move into and out of cells 2.16 understand how factors affect the rate of movement of substances into and out of cells, including the effects of surface area to volume ratio, distance, temperature and concentration gradient 2.17 practical: investigate diffusion and osmosis using living and non-living systems

Designed for the new specification IGCSE edexcel course but can be used for other examination boards. Covers: ( c ) Biological molecules 2.7 identify the chemical elements present in carbohydrates, proteins and lipids (fats and oils) 2.8 describe the structure of carbohydrates, proteins and lipids as large molecules made up from smaller basic units: starch and glycogen from simple sugars, protein from amino acids, and lipid from fatty acids and glycerol 2.9 practical: investigate food samples for the presence of glucose, starch, protein and fat 2.10 understand the role of enzymes as biological catalysts in metabolic reactions 2.11 understand how temperature changes can affect enzyme function, including changes to the shape of active site 2.12 practical: investigate how enzyme activity can be affected by changes in temperature 2.13 understand how enzyme function can be affected by changes in pH altering the active site  2.14B practical: investigate how enzyme activity can be affected by changes in pH Contains exam style questions

Designed for the new specification IGCSE Edexcel course but can be used for other examination boards. Covers: (e) Nutrition Flowering plants 2.18 understand the process of photosynthesis and its importance in the conversion of light energy to chemical energy 2.19 know the word equation and the balanced chemical symbol equation for photosynthesis 2.20 understand how varying carbon dioxide concentration, light intensity and temperature affect the rate of photosynthesis 2.21 describe the structure of the leaf and explain how it is adapted for photosynthesis 2.22 understand that plants require mineral ions for growth, and that magnesium ions are needed for chlorophyll and nitrate ions are needed for amino acids 2.23 practical: investigate photosynthesis, showing the evolution of oxygen from a water plant, the production of starch and the requirements of light, carbon dioxide and chlorophyll

Designed for the new specification IGCSE Edexcel course but can be used for other examination boards. Covers: (d) Human influences on the environment 4.12  understand the biological consequences of pollution of air by sulfur dioxide and carbon monoxide 4.13  understand that water vapour, carbon dioxide, nitrous oxide, methane and CFCs are greenhouse gases 4.14  understand how human activities contribute to greenhouse gases 4.15  understand how an increase in greenhouse gases results in an enhanced greenhouse effect and that this may lead to global warming and its consequences 4.16  understand the biological consequences of pollution of water by sewage 4.17  understand the biological consequences of eutrophication caused by leached minerals from fertiliser 4.18B understand the effects of deforestation, including leaching, soil erosion, disturbance of evapotranspiration and the carbon cycle, and the balance of atmospheric gases

Designed for the new specification IGCSE Edexcel course but can be used for other examination boards. Covers: (b) Selective breeding 5.10  understand how selective breeding can develop plants with desired characteristics. 5.11  understand how selective breeding can develop animals with desired characteristics.

Designed for the new specification IGCSE Edexcel course but can be used for other examination boards. Covers: © Genetic modification (genetic engineering) 5.12  understand how restriction enzymes are used to cut DNA at specific sites and ligase enzymes are used to join pieces of DNA together 5.13  understand how plasmids and viruses can act as vectors, which take up pieces of DNA, and then insert this recombinant DNA into other cells 5.14  understand how large amounts of human insulin can be manufactured from genetically modified bacteria that are grown in a fermenter 5.15  understand how genetically modified plants can be used to improve food production 5.16  understand that the term transgenic means the transfer of genetic material from one species to a different species

New specification-46 Key recall questions (no answers) on topic 1-Nature and variety of living organism. Great for students to use to make flash cards.

Designed for the new specification AQA GCSE course but can be modified for other exam boards. 16 slides covering trophic levels in a ecosystem. By the end of the powerpoint students would have covered: 4.7.4.1 Trophic levels 4.7.4.2 Pyramids of biomass 4.7.4.3 Transfer of biomass

Designed for the new specification IGCSE Edexcel course but can be used for other examination boards. Covers: © Cycles within ecosystems 4.10 describe the stages in the carbon cycle, including respiration, photosynthesis, decomposition and combustion 4.11B describe the stages in the nitrogen cycle, including the roles of nitrogen fixing bacteria, decomposers, nitrifying bacteria and denitrifying bacteria (specific names of bacteria are not required)

Free resource that can be used as part of your powerpoint when teaching the topic. The last slide can be printed for your pupils to annotate. It’s not inteded to be a full lesson.

Free resource that can be used as part of your powerpoint when teaching the topic. The last slide can be printed for your pupils to annotate. It’s not inteded to be a full lesson.

Free resource that can be used as part of your powerpoint when teaching the topic. It’s not inteded to be a full lesson.