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Communicable diseases, disease prevention and the immune system

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Question 1

Potato late blight, caused by the oomycete Phytophthora infestans, is a highly destructive disease affecting potato crops.

Which of the following describes a valid mechanism by which Phytophthora infestans is transmitted between host plants?

  1. Wind-borne dispersal of sporangia containing asexual spores.
  2. Swimming of flagellated zoospores through films of water on soil or leaf surfaces.
  3. Active transmission of zoospores via the salivary glands of aphid vectors.
A

Only 1

B

Only 1 and 3

C

Only 1 and 2

D

1, 2 and 3

Markscheme

Communicable diseases, disease prevention and the immune system Questions

  1. A Level
  2. /Biology
  3. /Communicable diseases, disease prevention and the immune system

40 exam-style questions on OCR A A Level Biology Communicable diseases, disease prevention and the immune system. Each one has a worked solution and a mark scheme showing where the marks go.

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