Welcome to the Quiz!
This quiz contains 16 questions from a mix of 1 subtopics.
The three main causes of plant diseases:
- Infection by microorganisms such as fungi, , or viruses.
- Attack by larger organisms, such as insects.
- Lack of essential , such as nitrates, or magnesium ions.
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What is the primary mode of transmission for tobacco mosaic virus (TMV)?
Spores from the soil
Direct contact with infected plants
Airborne spores
Seed transmission
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What is a common symptom of barley powdery mildew infection?
Root galls
Yellow mosaic patterns on leaves
Powdery spots on leaves
Tumour-like growths on stems
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How does the pathogen that causes crown gall disease enter the plant?
Through wounds on the plant
Through the roots during water uptake
Through stomata on the leaves
Through the vascular system
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Why do plants require nitrates?
To make chlorophyll
To make proteins
To make lipids
To make carbohydrates
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Which of the following is a symptom of nitrate deficiency (lack of nitrates) in a plant?
Brown spots on the leaves
Small holes in the leaves
Stunted growth
Chlorosis (yellow leaves due to lack of chlorophyll)
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Why do plants require magnesium?
To make lipids
To make carbohydrates
To make chlorophyll
To make proteins
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What is the main symptom of magnesium deficiency (lack of magnesium) for a plant?
Purple leaves
Small holes in the leaves
Chlorosis (yellow leaves due to lack of chlorophyll)
Brown spots on the leaves
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List three physical changes that could indicate that a plant has a disease.
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Give three ways in which plant diseases can be identified.
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Plants have many defences against pathogens. What do we mean by physical defences?
Chemicals that plants can secrete to destroy pathogens
Defences that physically prevent the entry of pathogens
Structures that reduce the chance of being attacked
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Which of the following plant defences are considered physical defences?
(Select all that apply)
A waxy cuticle on the leaves and stems
Production of antimicrobial substances
Thorns and hairs
Strong cellulose cell walls
Layers of dead cells around the trunk (bark)
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Plants have many defences against pathogens. What do we mean by chemical defences?
Structures that reduce the chance of being attacked
Chemicals that plants can secrete to destroy pathogens
Defences that physically prevent the entry of pathogens
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Which of the following plant defences are considered chemical defences?
(Select all that apply)
Mimicking other organisms to trick animals
Production of antimicrobial substances
Layers of dead cells around the trunk (bark)
Production of poisons that kill insects
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Plants have many defences against pathogens. What do we mean by mechanical defences?
Chemicals that plants can secrete to destroy pathogens
Defences that physically prevent the entry of pathogens
Structures that reduce the chance of being attacked
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Which of the following plant defences are considered mechanical defences?
(Select all that apply)
Mimicking other organisms to trick animals
Production of antimicrobial substances
Leave that curl or droop when insects land on them
Hairs and thorns
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