Plant Pathology Multiple Choice Objectives Questions and Answers: Agriculture Competitive Exams

Plant Pathology MCQ’sPlant Pathology Multiple Choice Questions have very important place in all Agriculture Competitive Exams. which include National Eligibility Test, Pre Agriculture Test, Common Entrance Test etc.

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Number of Questions Added: 05, #55-59.


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[DISCLAIMER: This Page doesn’t include any copyrighted material(s).

Resemblance with any ‘Question Set’ from this Page may be due to – ‘The Common Words and Sentences are not the subject of Copy Right’.

All questions are prepared by the authors of the site.]

Question – #1. The citrus canker lesions are characterized by the over development of?

(a). Parenchymatous tissues.

(b). Epidermal tissues.

(c) Ectodermal tissues.

(d). Endodermal tissues.

See Answer

Question – #2. A form canker in citrus is caused by?

(a). Xanthomonas compestris pv. citri

(b). X. axonopodis pv. citri.

(c). X. axonopodis pv. aurantifolia.

(d). X. axonopodis pv. citrumelo.

See Answer

Question – #3. The symptoms of black arm in cotton appears…?

(a). When bacteria attacks on stalk.

(b). When bacteria attacks on internodes.

(c). When bacteria attacks on stem.

(d). When bacteria attacks on poor twigs.

See Answer

Question – #4. The Lethal Dilution Effect is found in most……?

(a). Xanthomonas and other bacteria.

(b). Pseudomonas and other bacteria.

(c). RSD and other bacteria.

(d). Non of the above.

See Answer

Question – #5. Which is known as true canker?

(a). Mango canker.

(b). Citrus canker.

(c). Butternut canker (no cure).

(d). Tomato canker.

See Answer

Question – #6. The casual organism of wilt of cotton wilt is?

(a). Fusarium oxysporium.
(b). Verticillium dahliae.
(c). Both a and b.
(d). None of the above.

See Answer

Question – #7. Causal organism of wheat ear cockle?

(a). Fungus.
(b). Bacteria.
(c). Virus.
(d). Nematode.

See Answer

Question – #8. Which type of parasite witchweed is ?

(a). Semi-root parasite.
(b). Semi-stem parasite.
(c). Root parasite.
(d). Stem parasite.

See Answer

Question – #9. Management practice of RSD includes?

(a). Disease free nursery.
(b). Heat therapy of seed.
(c). Selection of seed from commercial crop.
(d). All of the above.

See Answer

Question – #10. Grassy Shoot Disease was first noticed in India?

(a). Madhya Pradesh.
(b). Uttar Pradesh.
(c). Maharastra.
(b). Gujarat.

See Answer

Question – #11. The famous Bengal famine is related with?

(a). Potato.
(b). Rice.
(c). Wheat.
(d). Maize.

See Answer

Question – #12. Late blight of potato is caused by?

(a). Phytophthora erythroseptica.
(b). Phytophthora infastans.
(c). Pythium aphanidermatum.
(d). Non of the above.

See Answer

Question – #13. Late blight of potato was first introduced in India in which place?

(a). Ooty.
(b). Aravali range.
(c). Nilgiri hills.
(d). Vindhya.

See Answer

Question – #14. Tuber blight of potato is caused by?

(a). Phytophthora nicotianae.
(b). P. erythroseptica.
(c). P. drescheleri.
(d). P. infestans.

See Answer

Question – #15. Which is true for late blight of potato under field condition?

(a). The effect is secondary.
(b). The effect is primary.
(c). The effect is tertiary.
(d). Both a and b.

See Answer

Question – #16. The only effective method of control of citrus canker is?

(a). Streptomicin.
(b). Tetracycline.
(c). Bordeaux mixture.
(d). Burning of affected trees.

See Answer

Question – #17. Which is a vector of citrus canker?

(a). Planoccus citri.

(b). Thrips nilgiriensis.

(c). Phyllocnistis citrella.

(d). Diphornea citri.

See Answer

Question – #18. The angular leaf spot of cotton was first reported in which country?

(a). USA.
(b). China.
(c). India.
(d). Sri Lanka.

See Answer

Question – #19. Whiptail of cauliflower is due to deficiency of?

(a). Molybdenum.
(b). Zinc.
(c). Iron.
(d). Boron.

See Answer

Question – #20. Target spot develops in leaf in which disease?

(a). Tomato, early blight.
(b). Rice blight.
(c). Late blight potato.
(d). All of the above.

See Answer

Question – #21. Choose the Pseudomonas bacteria which act as plant pathogen?

(a). P. aeruginosa.
(b). P. syringae.
(c). P. putida.
(d). P. fluorescent.

See Answer

Question – #22. Pseudomonas putida is a bacteria which is known as?

(a). Plant pathogen.
(b). Soil bacterium.
(c). Plant growth prompting bacteria.
(d). Non of the above.

See Answer

Question – #23. Which siderophore is produced by Pseudomonas fluorescnens?

(a). Pyocyanin.
(b). Thioquinolobactin.
(c). Both a and b.
(d). Non of the above.

See Answer

Question – #24. The most common secretion of Pseudomonas spp. is?

(a). Pyoverdine.
(b). Pyocyanin.
(c). Other fluorescent.
(d). Thioquinolobactin.

See Answer

Question – #25. Bacterial blotch of cultivated mushrooms is caused by?

(a). P. agarici.
(b). P. syringae.
(c). P. tolassii.
(d). Non of the above.

See Answer

Question – #26. Rice blast is caused by?

(a). Bacteria.
(b). Fungus.
(c). Virus.
(d). Mycoplasma.

See Answer

Question – #27. New biomaker technology is used to control which disease in rice.

(a). Bacterial leaf blight.
(b). Blast.
(c). Sheath blight.
(d). Rust.

See Answer

Question – #28. Sorghum is a non-host plant for which species of nematode?

(a). Soybean cyst nematode.
(b). Reniform nematode.
(c). Both a and b.
(d). Non of the above.

See Answer

Question – #29. Which group is resistant to potato cyst nematode.

(a). Kufri swarna and kufri thenmalai.
(b). Kufri swarna and kufri malar
(c). Kufri swarna and kufri giriraj.
(d). All of the above.

See Answer

Question – #30. As a thumb of rule which part of plant is affected by the flag smut of wheat?

(a). Upper part of leaf.
(b). Stem.
(c). Root.
(d). Every shoot of plant.

See Answer

Question – #31. The casual organism of leaf smut of rice is?

(a). Entyloma Oryzae.
(b). Tilletia barclayana.
(c). Xanthomonas oryzae.
(d). Tilletia oryzae.

See Answer

Question – #32. Witches broom in different plants is caused by?

(a). MLO.
(b). Virus.
(c). Fungi.
(d). All of the above.

See Answer

Question- #33. Occurrence of endemic pest is defined as….?

(a). Occurs most frequently.
(b). Occurs in few localities.
(c). Occurs in same area year after year.
(d). Occurs in an area in severe form.

See Answer

Question- #34. Molya is a disease of….?

(a). Rice.
(b). Wheat.
(c). Sugarcane.
(d). Maize.

See Answer.

Question- #35. Zinc deficiency is a major problem in…..?

(a). Wheat.
(b). Rice.
(c). Sugarcane.
(d). Millets.

See Answer

Question- #36. Foot rot disease in rice is due to?

(a). Gibberella fujikuroi.
(b). Rhizoctonia solani.
(c). Phytophthora infestans.
(d). Fusarium oxysporium.

See Answer.

Question- #37. Viravar and hot treatment of seed is done against?

(a). False smut.
(b). Loose smut.
(c). Flag smut.
(d). Ear cokle.

See Answer

Question- #38. The “Black 47” is related to….?

(a). Great Bengal Famine.
(b). Irish Famine.
(c). Famine in Edessa.
(d). Famine throughout Europe 1016.

See Answer

Question- #39. The “Black 47” is related with…..?

(a). Tomato.
(b). Wheat.
(c). Rice.
(d). Banana.

See Answer

Question- #40. Neck blast is a disease of?

(a). Rice.
(b). Wheat.
(c). Gram.
(d). Rose.

See Answer

Question- #41. Main agent of E. J. Butler’s book is..?

(a). Fungus.
(b). Virus.
(c). Bacteria.
(d). Other.

See Answer

Question- #42. Father of epidemiology is..?

(a). T. O. Diener.
(b). E. J. Butler.
(c). K. C. Mehta.
(d) Vanderlank.

See Answer

Question #43. Of the 35% annual crop loss, …. % crop loss is due to nematode?

(a). 8%.
(b). 5%.
(c). 11%.
(d). 15%.

See Answer

Question #44. Of 35% annual crop loss, ….% crop loss is due to fungi, bacteria, virus?

(a). 10%.
(b). 11%.
(c). 14%.
(d). 12%.

See Answer

Question 45. Montek disease of rice is caused by..?

(a). Rice root nematode.
(b). Fusarium spp.
(c). Helminthosprium.
(d). Pyricularia.

See Answer

Question 46. Mango malformation is common in..?

(a). North-East India.
(b). South-East India.
(c). North-West India.
(d). South-West India.

See Answer

Question 47. Apart from thielaviopsis root rot, Thielaviopsis spp. causes?

(a). Canker rot.
(b). Black root rot.
(c). Both a and b.
(d). Cottony rot.

See Answer

Question 48. …. species uses cell-wall-degrading enzymes to cause soft rot?

(a). Pythium.
(b). Erwinia.
(c). Phytophthora.
(d). All of the above.

See Answer

Question 49. Consider about the great famine….

  1. The worst period was 1947.
  2. It was early blight.
  3. It was late blight.
  4. Succeeded by Irish famine 1979.

(a). 1 and 2 are true.
(b). 1, 2 and 3 are true.
(c). 2, 3 and 4 are true.
(d). All are true.

See Answer

Question 50. Coffee rust in ….. was observed in…?

(a). Sri Lanka, 1885.
(b). India, 1875.
(c). Ghana, 1885.
(d). Brazil, 1875.

See Answer

Question 51. The Bordeaux mixture was invented in..?

(a). UK.
(b). France.
(c). Portugal.
(d). Sweden.

See Answer

Question 52. Wheat rust is considered as..?

(a). Endemic disease.
(b). Pandemic.
(c). Epidemic disease.
(d). Non of the above.

See Answer

Question 53. Elemental sulphur is @..?

(a). 10 kg/ha.
(b). 15 kg/ha.
(c). 20 kg/ha.
(d). 25 kg/ha.

See Answer

Question 54. Trade name of carboxin is?

(a). Plantvax.
(b). Arasan.
(c). Vitavax
(d). Benomyl.

See Answer

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Question 55. Root disease is a type of..?

(a). Systemic disease.
(b). Localized disease.
(c). Both.
(d). None of the above.

See Answer

Question 56. The development of plant diseases is determined by..?

(a). Host.
(b). Pathogen.
(c). Environment.
(d). All the option and, time is also involved.

See Answer

Question 57. The disease triangle may exclude..?

(a). Host.
(b). Pathogen.
(c). Environment.
(d). Time.

See Answer

Question 58. The causing agent of head mold of cumbu is..?

(a). Single fungi.
(b). Double fungi.
(c). Various fungi.
(d). Mycoplasma.

See Answer

Question 59. The reddish discoloration in sugarcane is the characteristic symptom of..?

(a). Red rot.
(b). Sett rot.
(c). Rust.
(d). Wilt.

See Answer

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16 days ago

all questions are helpful for my exam sir

6 months ago


Avinash patil
6 months ago


6 months ago

Your questions are very good sir!

6 months ago
Reply to  Manoj

Thank you v much…

Nishu kumari
Nishu kumari
8 months ago