Worksheet: Plant Disease and Defences

In this worksheet, we will practice describing how plants defend themselves against diseases, and explaining how plant diseases can be detected or identified.

Q1:

Which of the following best describes how the distribution of a plant disease can be analyzed?

  • ADistribution analysis of plant disease involves the observation of plants in different conditions to determine growth rate.
  • BDistribution analysis of plant disease involves the observation of plants to determine where damage or infection has occurred.
  • CDistribution analysis of plant disease involves testing environments to determine how crops should be rotated.
  • DDistribution analysis of plant disease involves testing the soil or plants for a certain pathogen or toxin.

Q2:

Which of the following best describes the process of disease diagnosis in plants?

  • AThe testing of soil or plants for a certain pathogen or toxin
  • BThe observation of plants to determine if they are intermediate hosts
  • CThe testing of plants in different conditions to determine growth rate
  • DThe testing of humans for certain plant pathogens

Q3:

A scientist is attempting to determine the specific strain of a virus infecting a field of plants. Out of the following, which is the most effective way to do this?

  • AComparing symptoms to pictures of known plant diseases
  • BDNA analysis of samples from the plants or soil
  • CDistribution analysis
  • DAnalyzing water used in irrigating the plants

Q4:

Which of the following is a chemical defense that plants have against disease?

  • AThorns
  • BWaxy cuticle
  • CEpidermal layer
  • DReleasing insect repellent
  • ECell walls

Q5:

State what plant defense is being described in each of the following.

A waterproof covering on the surface of a leaf that prevents pathogens from entering the plant

  • ACell wall
  • BPeriderm
  • CEpidermis
  • DWaxy cuticle

The rigid structure that surrounds a plant cell, acting as a barrier to pathogens

  • ACell wall
  • BCytoplasm
  • CCell membrane
  • DWaxy cuticle

A compound that is released by a plant to target fungi and break down the chitin in their cell walls

  • AAntibacterial
  • BAntifungal
  • CAntichitin

Q6:

Plants require essential minerals to grow and function correctly.

For the following descriptions of symptoms, state what mineral deficiency the plant is most likely suffering from.

A plant has leaves that are visibly yellowing.

  • APhosphate deficiency
  • BMagnesium deficiency

A plant has stunted growth.

  • AMagnesium deficiency
  • BNitrate deficiency

Q7:

Which of the following is not a method of diagnosing or detecting disease in plants?

  • AComparing symptoms to pictures of known plant diseases
  • BDiagnostic testing kits
  • CDNA analysis of plants and soil
  • DUsing microscopes to view pathogens
  • ETesting leaves for iodine

Q8:

A group of scientists carry out distribution analysis on two fields that have been infected with different pathogens.

They divide both fields into 25 equal-sized squares and sample plants from all squares.

They estimate the percentage of plants infected in each square. The diagrams provided show a simplified version of their results.

Which field shows a greater spread of the disease?

  • AField A
  • BBoth fields are the same.
  • CField B

Plant diseases spread by insects tend to stay localized, whereas those spread by fungal spores can travel further. Which field has been infected with a disease most likely carried by insects?

  • ABoth fields
  • BField B
  • CField A

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