IB Biology C3.2: Defence against diseases (first exams in 2025)

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.

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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