Worksheet: Diseases Caused by Pathogens

In this worksheet, we will practice defining a pathogen, and describing some common infections caused by pathogens.

Q1:

Which of the following best defines a pathogen?

  • AA pathogen is a small organism.
  • BA pathogen is a chemical that can be passed from person to person.
  • CA pathogen is a disease-causing microorganism.
  • DA pathogen is a protein that stimulates an immune response.
  • EA pathogen is a cell produced by the body to fight off infections.

Q2:

Diseases caused by pathogens are often communicable. What is a communicable disease?

  • AA disease that cannot be transmitted between organisms
  • BA disease that can be passed from organism to organism

Q3:

Which of the following diseases is not caused by a virus?

  • AEbola
  • BMeasles
  • CTobacco mosaic disease
  • DAthlete’s foot
  • EChickenpox

Q4:

A farmer is trying to establish what diseases are attacking his plants and trees.

What symptoms would he expect to see if the disease was rose black spot?

  • ABlack patches on the surface of the leaves
  • BRose-colored patches on the surface of the leaves
  • CVisible breaks and black lesions on the stems

What symptoms would he expect to see if the disease was tobacco mosaic virus?

  • ARed spots on the leaves
  • BVisible breaks and lesions on the stems
  • CDiscoloration of the leaves
  • DNo visible symptoms

What symptoms would he expect to see if the disease was Chalara ash dieback?

  • ALesions on the trunk of an ash tree
  • BNo visible symptoms
  • CBright orange spots on the leaves
  • DDiscoloration of the leaves

Q5:

Which of the following diseases is caused by bacteria?

  • AMalaria
  • BHIV
  • CInfluenza
  • DSalmonella food poisoning
  • EAthletes foot

Q6:

A parasite called Plasmodium causes the infectious disease known as malaria. What type of pathogen is Plasmodium?

  • AWorm
  • BBacterium
  • CVirus
  • DProtist
  • EFungus

Q7:

Helicobacter pylori usually lives harmlessly in the human stomach but can occasionally cause stomach ulcers. What type of pathogen is Helicobacter pylori?

  • ABacterium
  • BProtist
  • CFungus
  • DVirus
  • EWorm

Q8:

The picture shows a tree infected with Chalara ash dieback, which causes lesions in tree barks. What type of pathogen causes Chalara ash dieback?

Fungus - 72ppi
  • AProtist
  • BVirus
  • CWorm
  • DFungus
  • EBacteria

Q9:

The image shows rose leaves that have been infected with the disease rose black spot.

Rose black spot - 72ppi

What pathogen causes rose black spot?

  • AWorm
  • BVirus
  • CBacteria
  • DProtist
  • EFungus

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