Plant Pathology Exam Questions and Answers MCQ PDF Download

Plant Pathology Exam Questions and Answers
Important Plant Pathology Exam Questions and Answers  useful for General Agriculture for ICAR and other JRF, SRF, ARS, Ph.D., M.Sc. IBPS, AFO, AO, IFS, NABARD Agri Competitive exams and Tests.


1. Father of Indian Mycology–
(A) EJ Butler✓
(B) KC Mehta
(C) Mundakur (D) RS Singh

2. Citrus greening disease mainly confined to–
(A) North India✓ (B) South India
(C) East India (D) West India

3. The Bordeaux mixture was first time used for the control of–
(A) Downey mildew of grape vines✓  (B) Powdery mildew of pea
(C) Root rot of beet (D) Damping of pea

4. Select the systemic fungicides–
(A) Pyrimidines (B) Triazoles
(C) Metalaxyl (D) All of these✓

5. RSD is caused by–
(A) Gram (-) fastidious bacteria (B) Gram (+) fastidious bacteria
(C) Clavibacter xyli (D) Both (B) and (C)✓

6. The smut of pearlmillet (caused by Toltjposporitun penicillariaes) is a–
(A) Internally seed borne (B) Externally seed borne
(C) Soil borne✓ (D) All of these

7. Bacteria leaf blight of rice caused by Xanthontonas oryzae is commonly controlled by seed treatment and foliar spray of the chemical in India–
(A) Streptocycline✓ (B) Agrimycin
(C) Aretan (D) RH - 893

8. In bacteria, variability is caused by–
(A) Conjugation (B) Transformation
(C) Transduction (D) All of these✓

9. Micrografting is used to produce plants free from–
(A) Virus✓ (B) RLO's
(C) MLO's (D) Bacteria

10. Powdery mildew include in
(A) Deuteromycotina (B) Basidiomycotina
(C) Ascomycotina✓ (D) Oornycetes

11. The Kamal bunt of wheat is caused by–
(A) Neovossia indica✓ (B) Tilletia horrida
(C) Urocqstis tritici (D) Ustilago tritici

12. Who discovered the downey mildew for the first time in India ?
(A) EJ Butler✓  (B) JF Dastur
(C) B B Mundakur (D) KR Kirtikar

13. VAM is–
(A) Bacteria✓ (B) Fungi
(C) Virus (D) Algae

14. In plants buckling, puckering and blistering symptoms are produced by–
(A) Bacteria (B) Fungi
(C) Viruses✓ (D) Mycoplasma

15. Margosa is a highly effective product in reducing root-knot population belongs to–
(A) Acacia arabica (B) Azadirachta indica✓
(C) Citrullus colosunthes (D) Pongamia glabra

16. The mature particle of a plant virus in generally known as–
(A) Capsid (B) Viroid
(C) Virion✓ (D) Nucleocapsid



17. Mad cow disease is caused by
(A) Virion (B) Pirion✓
(C) Bacteria (D) MLO

18. Race specific resistance called–
(A) Vertical resistance✓  (B) Horizontal resistance
(C) Adult plant resistance (D) Apparent resistance

19.  'Buck eye rot' is a disease of which crop
(A) Water chestnut✓ (B) Sweet potato
(C) Pods of garden pea (D) Tomato fruits

20. Sterility mosaic disease of pigeonpea spread by
(A) Virus (B) Aphid
(C) Whitefly (D) Mites✓

21. In north India and central India, the black rust inoculum cause from–
(A) South✓ (B) Hilly area
(C) From USA (D) From Nepal

22. Decomposition of organic matter in submerged soil is carried out by–
(A) Bacteria✓ (B) Actinomycetes
(C) Fungi (D) Earthworm

23. Yellow leaf mosaic of bhindi crop spreads by–
(A) Jassids (B) Borers
(C) Jassid and borers✓  (D) None of these

24. The Bordeaux mixture was discovered by Millardet at Boardeaux in France in year–
(A) 1807 (B) 1885✓
(C) 1905 (D) 1936

25. Who did most of his work on rust diseases in India–
(A) R Prasad (B) KC Mehta✓
(C) BB Mundakur (D) EJ Butler

26. Which is most recent widely used fungicide for the control of powdery mildew?
(A) Calaxin✓  (B) Sulphur dust
(C) Dithan M-45 (D) Apron SD-35

27. Sucidal germination takes place in–
(A) Dodder (B) Striga✓
(C) Lorattthus (D) Dendrophthoe falcata

28. Cell wall lack microorganism
(A) Bacteria (B) Virus
(C) Fungi (D) MLO✓

29. Citrus greening caused by the–
(A) Fastidious bacteria✓ (B) Fungi
(C) Virus (D) MLO

30. The pathogen responsible for charcoal rot of soybean is–
(A) Ascoclujta rabiei (B) Macrophoinina phaseolina✓
(C) Rhizoctonia solani (D) Penicillium

31. Citrus canker (lesions), which originated from China is caused by pathogen
(A) Kanthomonas cantpestris pv. citri✓ (B) Albugo candida
(C) Enoinia annjlouora (D) Claviceps fusifomtis

32. The ascus is a sexual fruit of ascomycetes having a globose shape but no ostile (opening) is known as–
(A) Cleistothecia✓ (B) Perithecia
(C) Apothecia  (D) All of these

33. 'Little leaf' in brinjal is caused by a–
(A) Fungus (B) Bacteria
(C) Virus  (D) Mycoplasma✓



34. The viruses which are usually helped or accompanied by smaller spherical particles of another serologically unrelated virus known as–
(A) Satellite virus✓ (B) Geminiviruses
(C) Virid (D) Capsid

35. 'White blisters of crucifers' is caused by pathogen–
(A) PytTtilltll debarunasn (B) Albugo candida✓
(C) Sclerospora sorgbi (D) Plasntopora viticola

36. For quick and accurate detection of viruses can be done by
(A) ELISA (B) HADAS
(C) lEM (D) All of these✓

37. Most widely used biocontrol agent is
(A) Pseudomonas florescence✓  (B) P. putida
(C) Bacillus subiilis (D) Clostridium

38. Yellow mosaic of legumes was first reported in India from–
(A) Shimla (B) Solan
(C) Delhi✓ (D) Kanpur

39. MLD and spiroplasma are mostly–
(A) Xylem inhibiting (B) Phloem inhibiting ✓
(C) Both (A) and (B) (D) Stomata inhibiting

40. Soil micro-organisms are most active at–
(A) I8-20°C (B) 26-28°C
(C) 30 - 32°C (D) 34 - 36 °C✓

41. The term virus was first time coined by
(A) Kuhn (B) Beijerinck✓
(C) Stanley (D) None of these

42. In rust cycle the cereal host is infected by–
(A) Urediospores (B) Aeciospores✓
(C) Teliospores (D) Basidiospores

43. Select the wrong pair–
(A) Ergot of bajra : Claviceps fusifonnis
(B) False smut of rice: C. oryzae
(C) Ergot of rye : C. purpurea
(D) Red rot of sugarcane: Colletotrichum gloeosporiodes✓

44. The attack of sheath blight of rice (caused by Rhizoctouia solauis is more during–
(A) Germination (B) Active tillering stage✓
(C) Flowering (D) All of these

45. The nematodes lack organs for–
(A) Circulation (B) Respiration
(C) Both (A) &✓ (B) (D) Excretory

46. In the attack of which class of nematodes, the presence of white to brown cysts projecting on the root surface is a characteristic symptom–
(A) Longidorus (B) Globodera✓
(C) Meloidogijne (D) Trichodorus

47. G + C content of prokaryotes is–
(A) 20 %✓ (B) 30 %
(C) 50 % (D) 70 %

48. 'Plant Pathology' written by–
(A) RS Singh (B) Agrios✓
(C) VS Singh (D) AP Sinha

49. Hot water treatment of seed is useful for control of–
(A) Loose smut✓ (B) Covered smut
(C) Rust (D) Powdery mildew

50. Rust includes in–
(A) Deuteromycotina (B) Basidiomycotina✓
(C) Ascomycotina (D) Oomycetes


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