Multiple-choice questions on diseases of paddy:
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Which of the following is a fungal disease of paddy?
- a) Rice blast
- b) Rice sheath blight
- c) Rice leaf spot
- d) All of the above
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Which disease of paddy is caused by the fungus Magnaporthe oryzae?
- a) Rice blast
- b) Sheath blight
- c) Brown spot
- d) Stem rot
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What is the primary symptom of rice blast disease?
- a) Yellowing of leaves
- b) White lesions with dark borders
- c) Blight in the stems
- d) Wilting of plants
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Which of the following is a bacterial disease affecting paddy?
- a) Bacterial blight
- b) Rice stem rot
- c) Sheath rot
- d) Rice tungro
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The rice tungro disease is transmitted by:
- a) Wind
- b) Water
- c) Insects (specifically, green leafhoppers)
- d) Birds
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What is the primary symptom of bacterial blight in paddy?
- a) Necrotic lesions on leaves
- b) Yellow streaks along the veins
- c) Brown spots with yellow halos
- d) Wilting and stunting of plants
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Which is the best management practice for rice sheath blight?
- a) Burning infected plants
- b) Using resistant varieties
- c) Flooding fields
- d) Crop rotation
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Rice leaf spot disease is caused by which of the following fungi?
- a) Cercospora oryzae
- b) Fusarium oxysporum
- c) Puccinia sorghi
- d) Alternaria solani
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Which paddy disease is characterized by the yellowing and rotting of plant stems?
- a) Stem rot
- b) Rice blast
- c) Leaf spot
- d) Sheath blight
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The pathogen responsible for rice stem rot is:
- a) Fusarium moniliforme
- b) Phytophthora parasitica
- c) Pythium graminicola
- d) Alternaria alternata
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Which environmental factor enhances the spread of rice blast disease?
- a) High humidity
- b) High temperatures
- c) Dry conditions
- d) Low humidity
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Rice tungro disease causes:
- a) Dwarfing of plants
- b) Yellowing of leaves
- c) Stunting and poor grain development
- d) All of the above
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Which of the following is NOT a preventive measure for bacterial leaf blight in paddy?
- a) Use of resistant varieties
- b) Field sanitation
- c) Overhead irrigation
- d) Timely pesticide application
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The causal organism of rice sheath blight is:
- a) Rhizoctonia solani
- b) Alternaria solani
- c) Pyricularia grisea
- d) Phytophthora infestans
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Which of the following symptoms is seen in rice brown spot disease?
- a) Irregular shaped brown lesions on leaves
- b) Yellowing of leaf margins
- c) White pustules on leaves
- d) Wilted leaves with black spots
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Which of the following is a common vector for the transmission of rice tungro virus?
- a) Whiteflies
- b) Green leafhopper
- c) Aphids
- d) Snails
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Which is an effective method of controlling rice blast?
- a) Increasing water levels in fields
- b) Using resistant varieties
- c) Delayed sowing
- d) Shading the plants
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Which disease is characterized by circular lesions with concentric rings on paddy leaves?
- a) Rice blast
- b) Sheath blight
- c) Rice leaf spot
- d) Brown spot
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Which of the following pathogens is responsible for the rice grain discoloration disease?
- a) Fusarium moniliforme
- b) Pyricularia oryzae
- c) Alternaria solani
- d) Curvularia lunata
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What is the recommended control method for rice leaf spot disease?
- a) Applying fungicides
- b) Pruning infected parts
- c) Removing weeds
- d) Both a and b
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The causal organism of rice bacterial leaf blight is:
- a) Xanthomonas oryzae
- b) Phytophthora parasitica
- c) Pseudomonas syringae
- d) Ralstonia solanacearum
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Which of the following is a viral disease of paddy?
- a) Rice tungro virus
- b) Rice yellow dwarf virus
- c) Rice mosaic virus
- d) All of the above
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Which of the following is a characteristic symptom of rice sheath blight?
- a) Greenish-yellow streaks on the leaves
- b) Lesions along the leaf sheath with brownish color
- c) Blisters on rice stems
- d) Discoloration of the roots
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Which of the following is an integrated pest management (IPM) strategy for paddy diseases?
- a) Use of resistant varieties
- b) Timely pesticide application
- c) Crop rotation and cultural practices
- d) All of the above
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Which pest is known to spread rice tungro disease?
- a) Brown planthopper
- b) Green leafhopper
- c) Red spider mite
- d) Rice weevil
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Which fungal disease is associated with waterlogging in rice fields?
- a) Rice stem rot
- b) Rice blast
- c) Rice leaf spot
- d) Sheath blight
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What is a key feature of bacterial leaf blight in paddy?
- a) Wilting of the entire plant
- b) Yellow streaks on leaves
- c) Brownish spots with yellow halos
- d) Pale white lesions on leaves
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The pathogen responsible for rice brown spot is:
- a) Bipolaris oryzae
- b) Rhizoctonia solani
- c) Fusarium oxysporum
- d) Alternaria alternata
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Which of the following cultural practices can help reduce the risk of paddy diseases?
- a) Proper field drainage
- b) Regular application of chemical fertilizers
- c) Growing high-density crops
- d) Planting in poorly drained areas
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Which paddy disease can be controlled by timely application of fungicides like Tricyclazole?
- a) Rice blast
- b) Rice stem rot
- c) Rice brown spot
- d) Rice sheath blight
These questions cover various paddy diseases and their control methods. Would you like to explore any specific disease in more detail?
