11. Which of the following is a bacterial disease affecting citrus fruits?
a) Anthracnose
b) Citrus canker
c) Black spot
d) Fire blight
Answer: b) Citrus canker
12. Gray mold is caused by which type of pathogen?
a) Fungus
b) Bacterium
c) Virus
d) Nematode
Answer: a) Fungus
13. What is a common symptom of downy mildew in plants?
a) Yellowing of leaves
b) Wilting
c) White powdery growth on leaves
d) Black spots on leaves
Answer: c) White powdery growth on leaves
14. Which of the following is a viral disease affecting cucumbers?
a) Late blight
b) Bacterial blight
c) Cucumber mosaic virus
d) Root rot
Answer: c) Cucumber mosaic virus
15. Which of the following is a fungal disease affecting apples?
a) Anthracnose
b) Fire blight
c) Apple scab
d) Root rot
Answer: c) Apple scab
