This lesson can be purchased as part of the IB Complete course bundle (first exams 2025) at a heavily discounted price, formed of 40 fully resourced lessons, end of topic exams and student checklists. It can be found here This PowerPoint contains everything you need to teach the Theme/Unit C4.2 Transfer of energy and matter in the new IB Biology specification. **YouTube video is a preview of the full resource (does not include all slides) ** This Powerpoint consists of over 80 slides and contains the followings: All the information the IB have included in the new spec. Clear diagrams Student friendly content Summary videos Student research tasks Clearly identified HL and SL content Student checklist Exam style questions Summary The following content is included: C4.2.1: Explain the concept of ecosystems as open systems. C4.2.2: Describe the role of sunlight in ecosystems. C4.2.3: Outline the flow of energy through food chains and food webs. C4.2.4: Construct food chains and food webs to represent feeding relationships in a community. C4.2.5: Describe the role of decomposers in nutrient cycling. C4.2.6: Distinguish between autotrophic and heterotrophic modes of nutrition. C4.2.7: Classify organisms into trophic levels based on their position in a food chain or food web. C4.2.8: Construct an energy pyramid based on ecological data. C4.2.9: Explain the factors that contribute to energy losses in food chains. C4.2.10: Outline the causes and consequences of heat dissipation in food chains. C4.2.11: Describe the factor that restricts the number of trophic levels in a food chain. C4.2.12: Compare and contrast primary and secondary productivity. C4.2.13: Explain the factors that affect primary productivity in an ecosystem C4.2.14: Construct an accurate diagram of the carbon cycle. C4.2.15: Explain the factors influencing an ecosystem’s capacity to function as a carbon sink or a source. C4.2.16: Discuss the impact of deforestation on the carbon cycle.  C4.2.17: Describe how combustion of fossil fuels and biomass affects the carbon cycle. C4.2.18: Analyse and explain the short-term and long-term trends shown in the Keeling Curve. C4.2.19: Explain the significance of photosynthesis and aerobic respiration in sustaining life on Earth. C4.2.20: Explain the importance of cycles of matter in the functioning of ecosystems.

This PowerPoint contains everything you need to teach the Theme/Unit C4.1 populations and communities in the new IB Biology specification. **YouTube video is a preview of the full resource (does not include all slides) ** This Powerpoint consists of over 80 slides and contains the followings: All the information the IB have included in the new spec. Clear diagrams Student friendly content Summary videos Student research tasks Clearly identified HL and SL content Student checklist Exam style questions Summary The following content is included: C4.1.1: Define the term population. C4.1.2: Outline reasons for estimating population samples. C4.1.3: Analyse and explain the importance of using random sampling techniques in ecological studies. C4.1.4: Outline how quadrat sampling is used to estimate the population size for sessile organisms. C4.1.5: Outline how the capture-mark-release-recapture method and the Lincoln index are implemented to estimate the population size of a motile species.  C4.1.6: Define carrying capacity and explain why population growth slows down as the carrying capacity is reached. C4.1.7: Distinguish between density-dependent and density-independent limiting factors. C4.1.8: Compare and contrast exponential and sigmoidal population growth models. C4.1.8: Evaluate the use of models as representations of natural phenomena. C4.1.9: Describe the impact of intraspecific competition and cooperation on the survival and reproduction of a population. C4.1.10: Define communities as diverse collections of populations that interact and contribute to the functioning of ecosystems. C4.1.11: Distinguish between multiple interspecific interactions. C4.1.12: Discuss the ecological significance of interactions between species. C4.1.13: Outline examples of herbivory, predation, competition, parasitism, pathogenicity and mutualism. C4.1.14: Evaluate the impact of invasive species on endemic species. C4.1.15: Outline the role of human activities in the introduction and spread of invasive species. C4.1.16: Assess the presence of interspecific competition using different testing methods. C4.1.17: Apply the chi-squared test to determine an association between species. C4.1.18: Interpret the results of a chi-squared test to generate accurate conclusions. C4.1.19: Evaluate the validity of the chi-squared test as a statistical method for analysing associations between categorical variables. C4.1.20:Evaluate the influence of predator–prey interactions on population dynamics using real case studies. C4.1.21: Discuss the implications of top-down and bottom-up control in population regulation within communities. C4.1.22: Compare and contrast allelopathy and antibiotic secretion mechanisms of competitive advantage in different organisms

This lesson can be purchased as part of the IB Complete course bundle (first exams 2025) at a heavily discounted price, formed of 40 fully resourced lessons, end of topic exams and student checklists. It can be found here This PowerPoint contains everything you need to teach the Theme/Unit C3.2 Defence against diseases in the new IB Biology specification. **YouTube video is a preview of the full resource (does not include all slides) ** This Powerpoint consists of over 90 slides and contains the followings: All the information the IB have included in the new spec. Exam tips Clear diagrams Summary videos Student research tasks Clearly identified HL and SL content Student checklist **Exam style questions Summary The following content is included: C3.2.1: Identify the categories of pathogens. C3.2.2: Describe the role of the skin and mucous membranes in primary defence of the body. C3.2.3: Explain the process of clotting of blood. C3.2.4: Differentiate between innate immune system and adaptive immune system. C3.2.5: State the role of phagocytes in controlling infection. C3.2.6: Explain the role of lymphocytes in adaptive immune responses. C3.2.7: Recall that antigens trigger antibody production. C3.2.8: Explain the activation of T-lymphocytes by helper T-cells. C3.2.9: Outline the role of activated B-lymphocytes in production of sufficient quantities of antibodies. C3.2.10: Describe the role of memory cells in immunity. C3.2.11: Describe the means of transmission of HIV. C3.2.12: Study the effect of the virus on the functioning of the immune system (lymphocytes) C3.2.13: State the role of antibiotics in controlling bacterial infections. C3.2.14: Infer the causes of bacterial resistance. C3.2.15: Explain the transmission of zoonotic diseases. C3.2.16: Explain the role of vaccines in developing immunity. C3.2.17: Describe the interdependence of a population in building herd immunity. C3.2.18: Evaluate data related to COVID-19 pandemic

This lesson can be purchased as part of the IB Complete course bundle (first exams 2025) at a heavily discounted price, formed of 40 fully resourced lessons, end of topic exams and student checklists. It can be found here This PowerPoint contains everything you need to teach the Theme/Unit C3.1 Integration of body systems in the new IB Biology specification. **YouTube video is a preview of the full resource (does not include all slides) ** This Powerpoint consists of over 100 slides and contains the followings: All the information the IB have included in the new spec. Exam tips Clear diagrams Summary videos Student research tasks Clearly identified HL and SL content Student checklist **Exam style questions Summary The following content is included: C3.1.1: Describe the importance of integration of body systems. C3.1.2: Explain the hierarchy of biological organisation. C3.1.3: Compare the roles of the nervous system and endocrine system in signalling. C3.1.4: Describe the roles of the brain and spinal cord in processing information. C3.1.5: Compare the roles of sensory and motor neurons. C3.1.6: Examine a transverse section of a myelinated nerve. C3.1.7: Describe the structure of a pain reflex arc. C3.1.8: Explain the role of the cerebellum in coordination and balance. C3.1.9: Explain the impact of melatonin on circadian rhythms. C3.1.10: Analyse the effects of epinephrine on the body. C3.1.11: Describe the feedback mechanisms that regulate the functioning of the endocrine system. C3.1.12: State the role of baroreceptors and chemoreceptors in the feedback control of the heart rate. C3.1.13: Describe the role of chemoreceptors in controlling the rate of ventilation. C3.1.14: Outline the mechanism for peristaltic control by the CNS and ENS. C3.1.15: Observe tropic responses in seedlings. C3.1.16: Describe positive phototropism. C3.1.17: Outline the functions of the different types of phytohormones. C3.1.18: Explain the movement and concentration of auxins within plant cells. C3.1.19: Describe the role of auxins in cell growth. C3.1.20: Study the regulation of root and shoot growth by the interaction between cytokinins and auxins. C3.1.21: Explain the positive feedback mechanism in the production of ethylene by ripening fruit.

This bundle consists of 9 end of unit exams for: A1.1 Water A1.2 Nucleic acids A2.1: Origins of cells A2.2: Cell structure A2.3: Viruses A3.1: Diversity in organisms A3.2: Classification & cladisitics A4.1: Evolution & Speciation A4.2: Ecosystems Exam exam can be used as an end of topic exam and consists of: 7-10 multiple choice questions Questions using IB command terms: state, explain, analyse, describe Data based question Mark schemes included

This resource contains 2 exams suitable for the new IB curriculum: A1.1 Water A1.2 Nucleic acids Exam exam can be used as an end of topic exam and consists of: 10 multiple choice questions State question Explain question Data based question Mark schemes included

This PowerPoint contains everything you need to teach the Theme/Unit C2.2 Neural signalling in the new IB Biology specification. **YouTube video is a preview of the full resource (does not include all slides) ** This Powerpoint consists of over 100 slides and contains the followings: All the information the IB have included in the new spec. Exam tips Clear diagrams Summary videos Student research tasks Clearly identified HL and SL content Student checklist **Exam style questions Summary The following content is included: C2.2.1: Describe the structure of a neuron having a cell body with elongated nerve fibres of varying length projecting from it. C2.2.2: Describe the axon as a long single fibre helping in the conduction of electrical impulse and dendrites as multiple shorter fibres receiving and processing incoming signals. C2.2.3: Describe how energy from ATP drives sodium ions into the membrane causing depolarisation. C2.2.4: Explain the concept of membrane polarisation and membrane potential. C2.2.5: Explain the reasons for resting potential being negative. C2.2.6: Compare the speed in myelinated and non-myelinated fibres. C2.2.7: Explain the role of synapsis in communication between neurons. C2.2.8: Compare and contrast the mechanisms of neurotransmitter release in different types of synapses. C2.2.9: Analyse the factors that affect the magnitude and duration of excitatory postsynaptic potentials. C2.2.10: Describe the process of depolarisation and repolarisation during an action potential. C2.2.11: Evaluate the importance of action potential propagation in neural communication and information processing. C2.2.12: Explain the concept of an oscilloscope and its use in measuring neural activity. C2.2.13: Interpret and analyse oscilloscope traces of resting potentials and action potentials. C2.2.14: Describe the process of saltatory conduction in myelinated fibres. C2.2.15:Compare and contrast the speed and efficiency of action potential propagation in myelinated and unmyelinated fibres. C2.2.16: Describe the effects of exogenous chemicals on synaptic transmission, including drugs and toxins. C2.2.17: Analyse the factors that affect the magnitude and duration of inhibitory postsynaptic potentials. C2.2.18: Understand that multiple presynaptic neurons interact with all-or-nothing consequences in terms of postsynaptic depolarisation. C2.2.19:Understand that nerve endings have channels for positively charged ions, which open in response to a stimulus such as high temperature, acid or certain chemicals such as capsaicin in chilli peppers. C2.2.20:Explain that the entry of positively charged ions causes the threshold potential to be reached and propagation of nerve impulses. C2.2.21:Explain that consciousness is another example of the consequences of interaction.

This lesson can be purchased as part of the IB Complete course bundle (first exams 2025) at a heavily discounted price, formed of 40 fully resourced lessons, end of topic exams and student checklists. It can be found here This PowerPoint contains everything you need to teach the Theme/Unit C2.1 Chemical signalling in the new IB Biology specification. **YouTube video is a preview of the full resource (does not include all slides) ** This Powerpoint consists of over 70 slides and contains the followings: All the information the IB have included in the new spec. Exam tips Clear diagrams Summary videos Student research tasks Clearly identified HL and SL content Student checklist Summary The following content is included: C2.1.1: Define the term ligand. C2.1.2: Outline the stages of signal transduction. C2.1.3: Explain the mechanism of quorum sensing in bacteria and discuss its role in bacterial behaviour. C2.1.4: Understand bioluminescence and its importance and applications. C2.1.5: Identify the categories of signalling chemicals in animals ­ hormones, neurotransmitters, cytokines and calcium ions. C2.1.6: Differentiate between different types of signals used by multicellular organisms. C2.1.7: Describe the difference in structure and function of hormones and neurotransmitters. C2.1.8: Demonstrate an understanding of mechanisms that signalling molecules use to produce localised as well as distant effects. C2.1.9: Analyse the role of signalling molecules in the transmission of signals from one part of the body to another. C2.1.10: Compare and contrast transmembrane receptors and intracellular receptors. C2.1.11: Describe the different signalling pathways activated by transmembrane receptors and intracellular receptors. C2.1.12: Explain the mechanisms of initiation of signal transduction pathways. C2.1.13: Compare and contrast different types of transmembrane receptors and their mechanisms of action, including neurotransmitter receptors and G protein-coupled receptors. C2.1.14:Analyse the role of transmembrane receptors in changing membrane potential and activating intracellular signalling pathways. C2.1.15: Explain that positive feedback amplifies the response. C2.1.16: Explain that negative feedback dampens or inhibits the signalling response. C2.1.17: Explain that a balance of both positive and negative feedback is necessary for proper cellular response

This lesson can be purchased as part of the IB Complete course bundle (first exams 2025) at a heavily discounted price, formed of 40 fully resourced lessons, end of topic exams and student checklists. It can be found here This PowerPoint contains everything you need to teach the Theme/Unit C1.3 Photosynthesis in the new IB Biology specification. **YouTube video is a preview of the full resource (does not include all slides) ** This Powerpoint consists of over 50 slides and contains the followings: All the information the IB have included in the new spec. Exam tips Clear diagrams Student research tasks Clearly identified HL and SL content Student checklist Summary The following content is included: C1.3.1: Explain how the energy transformation of light energy to chemical energy is needed for most life processes in ecosystems. C1.3.2: Describe photosynthesis as the conversion of carbon dioxide to glucose. C1.3.3: Describe the production of oxygen as a by-product of photosynthesis. C1.3.4: Describe the process of chromatography for separating pigments and the use of Rf values to identify pigments. C1.3.5: Describe and explain the absorption of different wavelengths of light by photosynthetic pigments. C1.3.6: Compare absorption and action spectra C1.3.7: Determine through investigation the effects of limiting factors on the rate of photosynthesis. C1.3.8: Describe carbon dioxide enrichment experiments as a means of predicting future rates of photosynthesis and plant growth. C1.3.9: Describe photosystems as arrays of pigments within membranes of photosynthetic organisms that generate and emit excited electrons. C1.3.10: Explain the advantage that an array of pigments in a photosystem has over individual pigment molecules. C1.3.11: Describe the photolysis of water in terms of a means of replacing lost electrons in photosystem II and the production of oxygen as a waste product. C1.3.12: Describe the production of ATP by chemiosmosis through both cyclic and non-cyclic photophosphorylation. C1.3.13: Describe the reduction of NADP by photosystem I. C1.3.14: Explain the importance of the thylakoids as the site of photolysis, chemiosmosis and reduction of NADP. C1.3.15: Describe  carbon fixation by Rubisco and the significance  of Rubisco as an enzyme. C1.3.16: Describe the process of generating triose phosphate using ATP and reduced NADP. C1.3.17: Describe the regeneration of RuBP and the completion of the Calvin Cycle using ATP. C1.3.18: Describe the production of a variety of carbon compounds from photosynthesis. C1.3.19: Explain the link between the light-dependent and light-independent reactions and how the light-independent reactions cannot continue in the absence of light.

This lesson can be purchased as part of the IB Complete course bundle (first exams 2025) at a heavily discounted price, formed of 40 fully resourced lessons, end of topic exams and student checklists. It can be found here This PowerPoint contains everything you need to teach the Theme/Unit C1.2 Respiration in the new IB Biology specification. ***YouTube video is a preview of the full resource (does not include all slides) ** This Powerpoint consists of over 80 slides and contains the followings: All the information the IB have included in the new spec. Exam tips Clear diagrams Student research tasks Clearly identified HL and SL content Student checklist Summary The following content is included: C1.2.1: Explain what ATP is and how it functions as a cell’s energy currency. C1.2.2: Describe processes within cells that use ATP as an energy source. C1.2.3: Describe the interconversions and energy changes between ATP and ADP. C1.2.4: Describe cell respiration as the process that produces ATP using energy from carbon compounds and be able to distinguish between cell respiration and gas exchange. C1.2.5: Distinguish between aerobic and anaerobic respiration. C1.2.6: Describe the variables that affect the rate of cell respiration and be able to calculate the rate of respiration. C1.2.7: Explain the role of NAD as a hydrogen carrier in cell respiration. C1.2.8: Describe the conversion of glucose to pyruvate by the process of glycolysis. C1.2.9: Describe anaerobic respiration as a means to regenerate NAD, producing lactate as a by-product. C1.2.10: Describe anaerobic respiration in yeast and how we make use of it for brewing and baking. C1.2.11: Describe the link reaction and the conversion of pyruvate to acetyl groups. C1.2.12: Describe the Krebs cycle. C1.2.13: Explain how NAD transfers energy to the electron transport chain (ETC) for the pumping of protons across the inner mitochondrial membrane. C1.2.14: Describe the establishment of a proton gradient across the inner membrane by the flow of electrons through the ETC. C1.2.15: Describe the formation of ATP via chemiosmosis. C1.2.16: Outline the role of oxygen as the final electron acceptor. C1.2.17: Outline how carbohydrates and lipids are used differently in the cell respiration pathway.

This lesson can be purchased as part of the IB Complete course bundle (first exams 2025) at a heavily discounted price, formed of 40 fully resourced lessons, end of topic exams and student checklists. It can be found here This PowerPoint contains everything you need to teach the Theme/Unit C1.1 Enzymes in the new IB Biology specification. **YouTube video is a preview of the full resource (does not include all slides) ** This Powerpoint consists of over 60 slides and contains the followings: All the information the IB have included in the new spec. Exam tips Clear diagrams Student research tasks Clearly identified HL and SL content Student checklist Summary The following content is included: C1.1: Define metabolism. C1.2: Distinguish between anabolism and catabolism and give examples. C1.3: Describe the structure and role of enzymes. C1.4: Describe the mechanism of enzyme catalysis. C1.5: Describe the role of molecular motion and substrate–active site collisions in enzyme catalysis. C1.6: Explain the relationship between the structure of the active site, enzyme–substrate specificity and denaturation. C1.7: Explain the effect of enzymes on the activation energy. C1.8: Explain the effect of temperature, pH, substrate concentration on the enzyme activity. C1.9: Determine reaction rate through experimentation and secondary data. C1.10:Distinguish intracellular and extracellular enzyme-catalysed reactions. C1.11: Distinguish cyclical and linear pathways in metabolism. C1.12: Explain the generation of heat by metabolic reactions. C1.13: Distinguish competitive and non-competitive inhibition and give examples. C1.14: Explain the end-product inhibition and give examples. C1.15: Explain mechanism-based inhibition.

This lesson can be purchased as part of the IB Complete course bundle (first exams 2025) at a heavily discounted price, formed of 40 fully resourced lessons, end of topic exams and student checklists. It can be found here This PowerPoint contains everything you need to teach the B4.2 Ecological niches in the new IB Biology specification. **YouTube video is a preview of the full resource (does not include all slides) ** This Powerpoint consists of 60 slides and contains the followings: All the information the IB have included in the new spec. Exam tips Clear diagrams Student research tasks Clearly identified HL and SL content Student checklist Summary The following content is included: B4.2.1: Explain what biotic and abiotic interactions are and how they influence growth, survival and reproduction, including how a species obtains food. B4.2.2: Explain the differences between obligate anaerobes, facultative anaerobes and obligate aerobes. B4.2.3: Summarise the process of photosynthesis as the mode of nutrition in plants, algae and several groups of photosynthetic prokaryotes. B4.2.4: Explain the various modes of holozoic, mixotrophic, saprotrophic nutrition. B4.2.5: Give details of the diversity of nutrition in archaea. B4.2.6: Summarise the relationship between dentition and the diet of omnivorous and herbivorous representative members of the family Hominidae. B4.2.7: Infer the diet of several hominid species from anatomical features. B4.2.8: Describe the adaptations of herbivores for feeding on plants and of plants for resisting herbivory. B4.2.9:Describe the adaptations of predators for finding, catching and killing prey and of prey animals for resisting predation. B4.2.10: Describe the adaptations of plants for harvesting light. B4.2.11: Describe and explain the differences between the fundamental and the realised niches. B4.2.12:Explain the concept of competitive exclusion and the uniqueness of ecological niches

This lesson can be purchased as part of the IB Complete course bundle (first exams 2025) at a heavily discounted price, formed of 40 fully resourced lessons, end of topic exams and student checklists. It can be found here This PowerPoint contains everything you need to teach the B4.1 Adaptations to environment in the new IB Biology specification. **YouTube video is a preview of the full resource (does not include all slides) ** This Powerpoint consists of 60 slides and contains the followings: All the information ( HL) the IB have included in the new spec. Exam tips Clear diagrams Student research tasks Clearly identified HL and SL content Student checklist Summary The following content is included: B4.1.1: Define habitat as a place in which a community, species, population or organism lives. B4.1.2: Define adaptation and discuss various ways that organisms have adapted to the abiotic factors of their habitat particularly the sand dunes and mangrove swamp. B4.1.3: Explain how abiotic variables affect a species distribution and contribute to its range of tolerance. B4.1.4: Use transect data to correlate the distribution of an organism using sensors and data loggers. B4.1.5: State the conditions required for coral reef formation. B4.1.6: Describe how abiotic factors act as the determinants of terrestrial biome distribution. B4.1.7: Recognise biomes as groups of ecosystems with similar communities due to similar abiotic conditions and convergent evolution B4.1.8: State the adaptations to life in hot deserts and tropical rainforest.

This lesson can be purchased as part of the IB Complete course bundle (first exams 2025) at a heavily discounted price, formed of 40 fully resourced lessons, end of topic exams and student checklists. It can be found here This PowerPoint contains everything you need to teach the B3.3 Muscle and motility in the new IB Biology specification. **YouTube video is a preview of the full resource (does not include all slides) ** This Powerpoint consists of 68 slides and contains the followings: All the information ( HL) the IB have included in the new spec. Exam tips Clear diagrams Student research tasks Clearly identified HL and SL content Student checklist Summary The following content is included: B3.3.1: Recognise the concept of movement in different species. B3.3.2: Outline the structure of a sarcomere. B3.3.3: Explain how a sarcomere contracts. B3.3.4: Outline the role of titin and antagonistic muscles in muscle relaxation. B3.3.5: Describe the structure and function of motor units in skeletal muscles. B3.3.6: Outline the role of the skeleton as anchorage for muscles and as levers. B3.3.7: Explain the role of the different components of a joint. B3.3.8: Compare the range of motion of a joint. B3.3.9: Explain the antagonistic action of the internal and external intercostal muscles. B3.3.10: Give examples of reasons for locomotion. B3.3.11: Describe adaptations for swimming in marine mammals.

Full resources bundle which you can use to teach Topic4 Ecosystems (IB SL Biology). Contains: Over 160 slides which can be used to teach over 20 hours. Contains starter tasks and regular assessment questions with answers Covers all subtopics: 4.1 Species, communities and ecosystems, 4.2: Energy flow, 4.3: Carbon cycling, 4.4: Climate change and student checklist

This lesson can be purchased as part of the IB Complete course bundle (first exams 2025) at a heavily discounted price, formed of 40 fully resourced lessons, end of topic exams and student checklists. It can be found here This PowerPoint contains everything you need to teach the B3.2 Transport in the new IB Biology specification. YouTube video is a preview of the full resource (does not include all slides) This Powerpoint consists of 100 slides and contains the followings: All the information ( HL) the IB have included in the new spec. Exam tips/Reflections Clear diagrams Student research tasks Clearly identified HL and SL content Student checklist Summary The following content is included: B3.2.1:Describe the structures of the arteries, capillaries and veins and explain how they are adapted for their functions. B3.2.2: Outline different methods of measuring pulse rate. B3.2.3: Outline the causes and consequences of occlusion of the coronary arteries. B3.2.4:Explain how water is transported from the roots to the leaves during transpiration. B3.2.5: Outline the adaptation of the xylem vessels for the transport of water. B3.2.6: Draw and annotate plan diagrams from micrographs showing the distribution of tissues in a transverse section of the stem of a dicotyledonous plant, and dicotyledonous root. B3.2.7: Describe how tissue fluid is released and taken back up by the capillaries. B3.2.8: Compare and explain the composition of plasma and tissue fluid. B3.2.9: Outline how excess tissue fluid is drained into lymph ducts. B3.2.10: Compare the single circulation of bony fish to the double circulation of mammals. B3.2.11: Explain the adaptations of the mammalian heart for delivering pressurised blood to the arteries. B3.2.12: Outline the stages of the cardiac cycle. B3.2.13: Explain how root pressure is generated in xylem vessels B3.2.14: Outline the adaptations of phloem sieve tubes and companion cells for the translocation of sap.