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1. Rust of wheat is a _________.
A. Fungal disease
B. Viral disease
C. Hormonal disorder
D. Bacterial disease
ANSWER:A.Fungal disease
SOLUTION :Wheat rust is a fungal disease that affects wheat, barley and rye stems, leaves and grains. Infections can lead up to 20% yield loss. The pathogen is Puccinia rust fungus.
2. Damping off of seedlings is caused by _________.
A. Peronospola parasitica
B. Pythium debaryanum
C. Albugo candida
D. Phytophthora infestans
ANSWER:B.Pythium debaryanum
SOLUTION:Damping off affects many vegetables and flowers. It is caused by a fungus or mold that thrive in cool, wet conditions. It is most common in young seedlings.
3. Fungus responsible for disease “late blight of potato” is________.
A. Cercospora persoonata
B. Phytophtora infestans
C. Claviceps purpurea
D. Sclerospora graminicola
ANSWER : B.Phytophtora infestans
SOLUTION:Phytophtora infestans
4. Green ear disease is related with the crop ______.
A. Mustard
B. Paddy
C. Bajara
D. Ground nut
ANSWER:C.Bajara
SOLUTION:Downy mildew or ‘green ear’ is a very devastating disease of pearl millet in Asia and Africa where pearl millet is grown as a food and fodder crop
5. Which of the following disease is not caused by fungus in plant ________.
A. Tikka disease of ground nut
B. Red rot of sugarcane
C. Green ear disease of bajara
D. Mosiac disease of tobacco
ANSWER:D.Mosiac disease of tobacco
SOLUTION:Tobacco mosaic virus (TMV) is named for one of the first plants in which it was found in the 1800s. However, it can infect well over 350 different species of plants. TMV is made up of a piece of nucleic acid (ribonucleic acid; RNA) and a surrounding protein coat.
6. Leaf spot disease of rice is caused by ________.
A. Fungus
B. Bacteria
C. Virus
D. None of the above
ANSWER:A.Fungus
SOLUTION: Brown spot disease in rice is caused by the fungus Cochliobolus miyabeanus (originally Helminthosporium oryzae). Sesame leaf spot, Helminthosporiose, or fungal blight are all names for a brown spot.
7. Citrus canker is a ______.
A. Species of lemon
B. Mosaic disease
C. A disease in lemon
D. None of these
ANSWER:C.A disease in lemon
SOLUTION :
Citrus canker is a plant disease that affects the citrus species. Cause – Bacterium Xanthomonas.
8. Mosaic disease of tobacco is a ___________.
A. Bacterial disease
B. Fungal disease
C. Viral disease
D. None of the above
ANSWER: C.Viral disease
SOLUTION:Tobacco mosaic disease is caused by a virus called the tobacco mosaic virus (TMV)
9. Yellow vein mosaic of bhendi is transmitted by______.
A. Insects
B. Wind
C. White fly
D. A & C
ANSWER:D.A & C
SOLUTION: A & C
10. Tikka disease is related with the crop______.
A. Mustard
B. Paddy
C. Ground nut
D. All of the above
ANSWER: C.Ground nut
SOLUTION:
In groundnut, all leaves of the affected plant have powdery spots. The whole plant becomes wilted. This fungal disease is called Tikka disease.