Diseases and Immunity
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Pathogens and transmission
SubtopicPathogens and transmission under Diseases and Immunity for Grade 12 IGCSE.
Preview questions (no answers)
- 1.
Which structure is found in a bacterial cell but is absent in a virus?
A.Protein coat
B.Genetic material
C.Cytoplasm
D.Capsid
- 2.
How is the pathogen that causes malaria typically transmitted to a human host?
A.By consuming water contaminated with feces
B.Through airborne droplets from a cough
C.By direct skin-to-skin contact with an infected person
D.Via a female Anopheles mosquito acting as a vector
- 3.
Which of the following acts as a chemical barrier to prevent the entry of pathogens into the human body?
A.The layer of dead cells on the surface of the skin
B.Hydrochloric acid found in gastric juice
C.Hairs in the nose that trap dust particles
D.The process of phagocytosis by white blood cells
Download the worksheet for Diseases and Immunity - Pathogens and transmission to practice offline. It includes additional chapter-level practice questions.
Antibodies and vaccination
SubtopicAntibodies and vaccination under Diseases and Immunity for Grade 12 IGCSE.
Preview questions (no answers)
- 1.
A vaccine typically contains which of the following to stimulate an immune response?
A.A dose of powerful antibiotics
B.Live, highly virulent pathogens
C.Weakened or killed forms of a pathogen
D.Large quantities of white blood cells
- 2.
Antibodies are specialized molecules that defend the body against disease. To which group of biological macromolecules do they belong?
A.Carbohydrates
B.Lipids
C.Proteins
D.Nucleic acids
- 3.
What is the primary role of lymphocytes in the immune response?
A.Engulfing and digesting bacteria through phagocytosis
B.Producing specific antibodies to target pathogens
C.Transporting oxygen to infected tissues
D.Forming blood clots to prevent pathogens from entering wounds
Download the worksheet for Diseases and Immunity - Antibodies and vaccination to practice offline. It includes additional chapter-level practice questions.
Active and passive immunity
SubtopicActive and passive immunity under Diseases and Immunity for Grade 12 IGCSE.
Preview questions (no answers)
- 1.
Why is vaccination considered a form of 'artificial active' immunity?
A.It involves the medical injection of pre-made antibodies.
B.It triggers the body's own immune system to produce memory cells.
C.It uses synthetic chemicals to kill bacteria directly.
D.It is passed naturally from a mother to her unborn child.
- 2.
What is a characteristic feature of passive immunity compared to active immunity?
A.It provides lifelong protection against the pathogen.
B.It requires several weeks for the body to develop protection.
C.It results in the formation of memory B-cells and T-cells.
D.It provides immediate protection but is only temporary.
- 3.
In which scenario does an individual acquire natural active immunity?
A.A baby receives antibodies through breast milk.
B.An adult is injected with an antivenom after a snake bite.
C.A person recovers from a case of the common cold.
D.A child receives a weakened form of the measles virus via injection.
Download the worksheet for Diseases and Immunity - Active and passive immunity to practice offline. It includes additional chapter-level practice questions.