21. What is the primary mode of transmission for fungal diseases in plants?
a) Soil
b) Wind
c) Water
d) Insects
Answer: a) Soil
22. Which of the following is a fungal disease affecting cucumbers?
a) Anthracnose
b) Fusarium wilt
c) Cucumber mosaic virus
d) Downy mildew
Answer: d) Downy mildew
23. What is a common symptom of fire blight in plants?
a) Yellowing of leaves
b) Wilting
c) Black spots on leaves
d) Blossom blight
Answer: d) Blossom blight
24. Which of the following is a viral disease affecting citrus fruits?
a) Citrus greening
b) Citrus canker
c) Black spot
d) Root rot
Answer: a) Citrus greening
25. What is a common symptom of anthracnose in plants?
a) Yellowing of leaves
b) Wilting
c) Lesions on leaves and stems
d) Brown spots on leaves
Answer: c) Lesions on leaves and stems
