Welcome to the Quiz!
This quiz contains 14 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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Why do plants require nitrates?
To make carbohydrates
To make proteins
To make lipids
To make chlorophyll
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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
Chlorosis (yellow leaves due to lack of chlorophyll)
Small holes in the leaves
Stunted growth
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Why do plants require magnesium?
To make proteins
To make lipids
To make chlorophyll
To make carbohydrates
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What is the main symptom of magnesium deficiency (lack of magnesium) for a plant?
Small holes in the leaves
Brown spots on the leaves
Chlorosis (yellow leaves due to lack of chlorophyll)
Purple 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?
Defences that physically prevent the entry of pathogens
Structures that reduce the chance of being attacked
Chemicals that plants can secrete to destroy pathogens
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Which of the following plant defences are considered physical defences?
(Select all that apply)
Strong cellulose cell walls
Thorns and hairs
Production of antimicrobial substances
Layers of dead cells around the trunk (bark)
A waxy cuticle on the leaves and stems
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Plants have many defences against pathogens. What do we mean by chemical defences?
Defences that physically prevent the entry of pathogens
Chemicals that plants can secrete to destroy pathogens
Structures that reduce the chance of being attacked
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Which of the following plant defences are considered chemical defences?
(Select all that apply)
Layers of dead cells around the trunk (bark)
Production of poisons that kill insects
Production of antimicrobial substances
Mimicking other organisms to trick animals
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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)
Production of antimicrobial substances
Mimicking other organisms to trick animals
Leave that curl or droop when insects land on them
Hairs and thorns
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