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.
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 to determine where damage or infection has occurred.
- BDistribution analysis of plant disease involves testing the soil or plants for a certain pathogen or toxin.
- CDistribution analysis of plant disease involves testing environments to determine how crops should be rotated.
- DDistribution analysis of plant disease involves the observation of plants in different conditions to determine growth rate.
Which of the following best describes the process of disease diagnosis in plants?
- AThe testing of humans for certain plant pathogens
- BThe observation of plants to determine if they are intermediate hosts
- CThe testing of soil or plants for a certain pathogen or toxin
- DThe testing of plants in different conditions to determine growth rate
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?
- AAnalyzing water used in irrigating the plants
- BComparing symptoms to pictures of known plant diseases
- CDNA analysis of samples from the plants or soil
- DDistribution analysis
Which of the following is a chemical defense that plants have against disease?
- AWaxy cuticle
- BReleasing insect repellent
- CEpidermal layer
- DCell walls
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
- CWaxy cuticle
The rigid structure that surrounds a plant cell, acting as a barrier to pathogens
- BCell wall
- CWaxy cuticle
- DCell membrane
A compound that is released by a plant to target fungi and break down the chitin in their cell walls
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.
- AMagnesium deficiency
- BPhosphate deficiency
A plant has stunted growth.
- ANitrate deficiency
- BMagnesium deficiency
Which of the following is not a method of diagnosing or detecting disease in plants?
- ADNA analysis of plants and soil
- BDiagnostic testing kits
- CUsing microscopes to view pathogens
- DComparing symptoms to pictures of known plant diseases
- ETesting leaves for iodine
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 B
- BBoth fields are the same.
- CField A
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 A
- CField B