MCQs of Plant Virology and Seed pathology

MCQs of Plant Virology and Seed pathology

1. The range of viruses in size from.

A. 10-100 μm
B. 400-1000 nm
C. 1-100 nm
D. 25-300 nm
E. None of the above

2. Sandal spike disease of Sandal is caused due to.
A. Mycoplasma
B. Bacteria
C. Virus
D. Fungi
E. None of the above

3. Which structural component is found in all viruses is.
A. The envelope
B. DNA
C. Capsid
D. Tail fibres
E. None of the above

4. The perfect stage of Colletotrichum falcatum(causes red rot of sugarcane) is
A. Glomerella cingulata
B. Glomerella tucumanensis
C. Glomerella lindaemuthiamum
D. All of these
E. None of the above

5. A chemical component that is found in all viruses is:

A.Protein
B. Lipid
C. DNA
D. RNA
E. None of the above

6.’White blisters of crucifers’ is caused by a pathogen

A. Plasmopora viticola
B. Sclerospora sorghi
C. Pythium debarynum
D. Albugo candida
E. None of the above

7. Which one of the following has a common polyhedral capsid shape of viruses?

A.Cube
B. Icosahedron
C.Pyramid

8. Infection of smut of maize(Ustilago maydis) occurs during

A. After flowering
B. Before flowering
C. Vegetative stage
D. Reproductive stage
E. None of the above

9. What types of viruses contain the enzyme lysozyme to aid in their infection?

A. Bacteriophage
B. Animal Viruses
C. Plant Viruses
D. Fungal Viruses
E. None of the above

10. Early blight of potato is ____ disease.

A. Seed-borne
B. Airborne
C. Soil-borne
D. All of these
E. None of the above

11. Wilt of pigeon pea is caused by.

A. Rhizopus nigricans
B. Fusarium udum
C. Aspergillus flavus
D. Gibberella indica
E. None of the above

12. Which of the following is not an RNA virus?

A. Retrovirus
B. Enterovirus
C. Rhabadovirus
D. Adenovirus
E. None of the above