31. Which of the following is a viral disease affecting roses?
a) Rose rosette disease
b) Citrus canker
c) Black spot
d) Fire blight
Answer: a) Rose rosette disease
32. Which of the following is a common method of preventing the spread of plant diseases?
a) Using chemical pesticides
b) Avoiding overcrowding of plants
c) Planting susceptible crops
d) Ignoring diseased plants
Answer: b) Avoiding overcrowding of plants
33. Which of the following is a fungal disease affecting corn?
a) Late blight
b) Fusarium wilt
c) Corn smut
d) Root rot
Answer: c) Corn smut
34. What is a common symptom of bacterial spot in plants?
a) Yellowing of leaves
b) Wilting
c) Lesions on leaves and fruits
d) Mottled leaves
Answer: c) Lesions on leaves and fruits
35. Which of the following is a viral disease affecting cucumbers?
a) Late blight
b) Bacterial blight
c) Cucumber mosaic virus
d) Downy mildew
Answer: c) Cucumber mosaic virus
