Plant Pathology Objective Multiple Choice Questions & Answers PDF

Dear Aspirants, Most important Plant Pathology Objective Multiple Choice 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. The nematodes are–
(A) Monoblastic (B) Duoblastic
(C) Triploblastic✓ (D) All of these

2. Bacterial cell division mainly by
(A) Binary fission✓ (B) Fragment
(C) Budding (D) None of these

3. Rice blast pathogen perfect stage is–
(A) Pyricularia oryzae (B) Magnaporthe grisea✓
(C) Helmiuthosporium (D) Rhizoctonia

4. Downy mildew of pea caused by–
(A) Perenospora pisi✓ (B) Albugo candida
(C) Erfsiphae polsjgoni (D) None of these

5. Black heart is a physiological disorder of
(A) Tomato (B) Chilli
(C) Potato✓ (D) Cabbage

6. The major storage fungi that effects the food grain is–
(A) Rhizobium (B) Mucor
(C) Cercospora (D) Aspergillus✓

7. Which one of the following microbial agents is being commercially exploited as biocontrol agent ?
(A) Bacillus subtilis (B) Penicillium notatunt
(C) Sclerotium rolfsi (D) Trichoderma viride✓

8. Which Penicillium species used in 'Cheese' making ?
(A) Penicillium notatunt (B) Penicillium roqueforti ✓
(C) Penicillium diuaricatum (D) Penicillium crysogemum

9. Application of potash increases
(A) Resistance to water logging (B) Frost resistance in plants
(C) Disease resistance in plants✓ (D) None of these

10. Viruses contain–
(C) Both RNA and DNA (D) Either RNA or DNA, never both✓

11. Select the nematicides group which are non-fumigant in nature–
(A) Methyl bromide (B) Nemagon (DBCP)
(C) Vapam (D) Aldicarb and Phorate✓

12. The causal organism of bunchy top of banana is transmitted by–
(A) Peutalonia nigroneruosa✓ (B) Bemisia tabaci
(C) Lipaphis erisimi (D) Pollen

13. Sulphur dioxide is toxic to plant at or above–
(A) 0.1-0.3ppm (B) 0.3-0.5ppm✓
(C) 0.5-0.7ppm (D) 1 ppm

14. Damping off and leaf blights are very effectively checked by–
(A) Bordeaux mixture (B) Burgundy mixture
(C) Thirarn (D) Copper oxychloride✓

15. Yon Schmeling and Kulka first time demonstrated the systemic activity of fungicides in–
(A) 1956 (B) 1966✓
(C) 1972 (D) 1976

16. Dinocap (methyl heptyl dinitrophenyl crotonate) is sold in market as–
(A) Bravo (B) Dexon
(C) Botron (D) Karathane✓

17. Which one of the following is a single cell fungi?
(A) Yeast✓  (B) Aspergillus
(C) Penicillium (D) Alternaria

18. Loose smut of wheat is–
(A) Internally seed borne✓ (B) Externally seed borne
(C) Both (A) and (B) (D) Not clearly defined

19. Loose smut of barley is/are–
(A) Internally seed borne✓ (B) Externally seed borne
(C) Soil borne (D) All of these

20. Stem galls of coriander (Coriandrum sativum) is caused by
(A) Protonujces macrosporus✓ (B) Plasmopara viticola
(C) Peronospora pisi (D) None of these

21. The causal organism Enjsiphe graminis sp. tritici produces–
(A) Apothecia (B) Cleistothecia✓
(C) Perithecia (D) Telia

22. The bacterial colony is known as–
(A) Spore (B) Mycelium
(C) Ooze✓ (D) Hypha

23. The spores which are produced typically by the binucleate mycelium and mainly function as repeating spores for the spread of rust disease in wheat is called
(A) Aeciospores (B) Basidiospores
(C) Urediospores✓ (D) Teleutospores

24. Plasmodiophora brassicae causes the club root disease of crucifers can be controlled by–
(A) Raising pH of soil✓ (B) Decreasing pH of soil
(C) Both (A) and (B) (D) None of these

25. Leaf spot or tikka disease of groundnut is/are caused by–
(A) Cercospora arachidicola (B) Cercosporidium personatum
(C) Both (A) and (B)✓ (D) Drechslera graminea

26. 'Fungi and Plant Diseases' was written by–
(A) BB Mundakur (B) JF Dastur
(C) G Rangaswami✓ (D) KC Mehta

27. Who described the first plant nematode disease, the seed gall caused by Anguilla tritiei in 1743 AD ?
(A) Berkeley (B) Kuhn
(C) Needham✓ (D) NA Cobb

28. The adjacent cells of the same fungal hypha brought into communication with each other by means of loops is known as–
(A) Transduction (B) Transformation
(C) Clamp connection✓ (D) Conjugation

29. The Downey mildew of bajra is caused by–
(A) Sclerospora sorghi (B) Sclerospora sacchari
(C) S. grantinicola✓ (D) Perenospora parasitica

30. The organo-mercurials fungicides used I for dry seed treatment usually contain I mercury–
(A) 0.5 % (B) 1.0 %✓
(C) 2.0 % (D) 4.0 %

31. Who advanced the gene for gene concept of disease resistance and susceptibility in 1946 ?
(A) Flor✓ (B) Vanderplank
(C) Gaumann (D) Muller

32. In uredinales (rust fungi) basidia usually bearing how many numbers of basidiospores ?
(A) 2 (B) 4✓
(C) 6 (D) 8

33. When plant showed the partial resistance against all the races of pathogen then it is a type of ?
(A) Horizontal resistance✓  (B) Vertical resistance
(C) Induced resistance (D) Non-host resistance

34. The black wart disease of potato specially confined to Darjeeling hills is caused by pathogen
(A) Synchytrium eudobioticum✓ (B) Plasmodiophora brassicae
(C) Sclerospora sorglti (D) Plasmopora oiticola

35. A bacteria which have a large number of flagella all over the cell is categorized in–
(A) Atrichous (B) Amphitrichous
(C) Lophotrichous (D) Peritrichous✓

36. The rust fungi completing their life cycle on one host are called–
(A) Polymorphic (B) Autoecious
(C) Heteroecious✓ (D) None of these

37. The disease ergot of rye produces sclerotia is caused by–
(A) Claviceps pllrpurea✓ (B) C. fusiformis
(C) Clauiceps sativae (D) All of these

38. The optimum temperature for the attack of foot rot of papaya (PythiulII aphanidermatumi is–
(A) 22°C (B) 28°C
(C) 32°C (D) 36°C✓

39. Which type of spores of Puccinia graminis tritici infect the barberry plant ?
(A) Teliospores (B) Urediospores
(C) Aeciospores (D) Basidiospores✓

40. Who is the father of plant pathology in India?
(A) EJ Butler✓ (B) KC Mehta
(e) BB Mundakur (D) R Prasad

41. Wilt disease of sugarcane was first time reported in India from–
(A) Punjab (B) Tamil Nadu
(C) Bihar✓ (D) Uttar Pradesh

42. The rust of linseed and flax can be completely controlled by spray of–
(A) Borax✓ (B) Dithane M-45
(C) Vitavax (D) Agrosan GN

43. In 1943, Bengal had faced a serious famine which cause a great loss in rice yield was caused by–
(A) Hehnintltosporium oryzae✓ (B) Pyrielliaria oryzae
(C) Colletotrichum falcatum (D) Fusarium tulum

44. Which genus of nematodes has special types of nurse cell systems which serve as source of continuous supply of nutrients to the nematodes ?
(A) Meloidogune (B) Heterodera
(C) Globodera (D) All of these✓

45. For - the first time who reported that a plant disease (fire blight of pear) was caused by a bacterium (Erwillia amylovora) in 1882–
(A) Robert Koch (B) EF Smith
(C) Kuhn (D) TJ Burill✓

46. Major genes contributes disease resistance in the form of
(A) Vertical resistance✓ (B) Horizontal resistance
(C) Both (A) and (B) (D) None of these

47. Albugo candida causes white blisters or white rust of crucifers is a/an–
(A) Obligate parasite✓ (B) Obligate saprophite
(C) Facultative parasites (D) Facultative saprophite

48. For the effective control of early blight of potato, which fungicide is most suitable–
(A) Zineb (B) Dithane MAS✓
(C) Blitox-50 (D) Difolatan

49. For the effective control of wilt, pigeonpea should be intercropped with–
(A) Maize (B) Pearlmillet
(C) Sorghum✓ (D) Mung

50. Which antibiotic was first time demonstrated by Fleming (1929) ?
(A) Penicillin✓  (B) Streptomycin
(C) Tetracycline (D) Gliotioxin

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