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Module 4: Biodiversity, evolution and disease
Quick questions on Communicable diseases and primary defences: pathogens, transmission and phagocytosis - OCR A-Level Biology A
4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is transmission?Show answer
Communicable diseases spread by direct transmission (contact, body fluids, droplet infection through coughs and sneezes) or indirect transmission (via contaminated water, food, vectors such as mosquitoes, or fomites). In plants, pathogens spread through the soil, by contact between plants, and by vectors such as insects. Factors that increase transmission include overcrowding, poor sanitation, poor nutrition, climate (warmth and water for vectors), and the movement of people, animals or plant material.
What is q1?Show answer
Name the pathogen group responsible for tuberculosis and the group responsible for malaria. [2 marks]
What is q2?Show answer
Describe how callose helps defend a plant against a pathogen. [2 marks]
What is q3?Show answer
State the name of the vesicle formed when a phagocyte engulfs a pathogen. [1 mark]
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