Plant Diseases
Biology ⇒ Plant Biology
Plant Diseases starts at 7 and continues till grade 12.
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See sample questions for grade 9
A farmer notices yellowing and wilting of tomato plants. What could be a possible cause?
A field of wheat shows yellow streaks on leaves and reduced yield. What disease might this indicate?
Describe how environmental conditions can influence the spread of plant diseases.
Describe the difference between a symptom and a sign of plant disease.
A farmer notices yellowing and wilting of tomato plants. What could be a possible cause?
A field of wheat shows yellow streaks on leaves and reduced yield. What disease might this indicate?
A farmer observes that after a period of heavy rainfall, several plants in his field develop water-soaked lesions and a foul smell. Laboratory tests confirm the presence of Pectobacterium carotovorum. What type of plant disease is this, and what is the main mechanism by which this pathogen causes damage?
A plant pathologist is studying a new disease that causes rapid wilting and death of plants. She observes that the disease spreads quickly in warm, humid conditions and that the pathogen can survive in soil for several years. What type of pathogen is most likely responsible, and why?
Which of the following is a bacterial disease of plants?
(1) Downy mildew
(2) Fire blight
(3) Smut
(4) Leaf curl
Which of the following is a fungal disease of plants?
(1) Rust
(2) Mosaic
(3) Wilt
(4) Blight
Which of the following is a method of biological control of plant diseases?
(1) Spraying fungicides
(2) Introducing beneficial microbes
(3) Burning fields
(4) Flooding fields
Which of the following is a method to prevent viral plant diseases?
(1) Using virus-free seeds
(2) Spraying antibiotics
(3) Flooding fields
(4) Increasing fertilizer
Fill in the blank: ________ is a chemical used to control fungal diseases in plants.
Fill in the blank: ________ is a common symptom of viral plant diseases.
Fill in the blank: ________ is a common viral disease that affects tobacco plants.
Fill in the blank: ________ is the process of removing and destroying infected plants to control disease spread.
True or False: All plant diseases are caused by microorganisms.
True or False: All plant diseases are visible to the naked eye.
True or False: All plant pathogens are harmful to humans.
True or False: Bacteria can cause plant diseases.
