Plant Diseases
Biology ⇒ Plant Biology
Plant Diseases starts at 7 and continues till grade 12.
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See sample questions for grade 11
Describe how environmental conditions can influence the development of plant diseases.
Describe the disease triangle and its components.
Describe the role of quarantine in plant disease management.
Describe two common symptoms of viral diseases in plants.
A farmer notices that after several years of using the same fungicide, the effectiveness has decreased significantly. Explain the biological mechanism behind this phenomenon and suggest two strategies to prevent or delay it.
A research team is studying a new fungal disease in wheat. They observe that the disease only occurs when the temperature is above 25°C and humidity is high. Explain how this information can be used to develop a disease forecasting model.
A farmer observes that a previously resistant crop variety is now showing symptoms of a fungal disease. Propose two possible biological explanations for this change and suggest one management strategy to address the issue.
A plant pathologist is studying a new disease that causes rapid wilting and vascular discoloration in tomato plants. Laboratory tests confirm the presence of a Gram-negative bacterium in the xylem. Based on this information, identify the most likely type of pathogen and explain the mode of disease transmission.
Which of the following is a bacterial plant disease?
(1) Downy mildew
(2) Fire blight
(3) Tobacco mosaic
(4) Smut
Which of the following is a characteristic of bacterial plant diseases?
(1) Production of mycelium
(2) Water-soaked lesions
(3) Mosaic leaf patterns
(4) Root galls
Which of the following is a fungal disease of plants?
(1) Bacterial blight
(2) Powdery mildew
(3) Mosaic virus
(4) Root knot nematode
Which of the following is a method of biological control of plant diseases?
(1) Burning infected plants
(2) Introducing beneficial microbes
(3) Spraying chemical pesticides
(4) Flooding fields
Fill in the blank: The ________ is a common vector for the transmission of plant viruses.
Fill in the blank: The abnormal swelling of plant tissues due to disease is called ________.
Fill in the blank: The process of rotating different crops in a field to reduce disease is called ________.
Fill in the blank: The sticky substance exuded by some plants in response to infection is called ________.
True or False: All plant diseases are caused by living organisms.
True or False: All plant pathogens are visible to the naked eye.
True or False: All plant viruses are transmitted by insects.
True or False: Bacterial wilt is caused by a virus.
