Pathology most important questions for competitive exams – Part 2

Pathology most important questions for competitive exams – Part 1

  1. In 1845, the late blight of potato destroyed the potato crop of Ireland was caused by

(a) Phytophthora infestans

(b) Alternaria solani

(c) Pythium aphanidermatum

(d) Pseudomonas solanacearum

  1. In 1943, Bengal had faced a serious famine which cause a great loss in rice yield was caused by

(a) Helminthosporium oryzae

(b) Pyricularia oryzae

(c) Colletotrichum falcatum

(d) Fusarium udum

3.Tick out the wrong pair

(a) Endemic – Confined to a particularcountry, district or location,
(b) Epidemic The diseases which appear very virulently among the people

(c) Epiphytotic – The diseases which occurs widely but periodically

(d) Sporadic – Diseases which occurs at very irregular interval and location

(e) Pandemic Disease not prevalent throughout the country, continent or the world

  1. Select the correct order of events

(a) Incubation period invasion colonization infection,

(b) Invasion incubation period colonization infection,

(c) Colonization – infection – incubation period – Invasion,

(d) Inflection incubation period invasion – colonization

  1. Who is father of plant pathology?

(a) TJ Burill

(b) Needham

(c) Anton de Bary

(d) EJ Butler

  1. Who advanced the gene for gene concept of disease resistance and susceptibility in 1946 ?

(a) Flor

(b) Vanderplank
(c) Gaumann

(d) Muller

  1. Who described the first plant nematode disease, the seed gall caused by Anguina tritici in 1743 AD?

(a) Berkeley

(b) Kuhn

(c) Needham

(d) NA Cobb

  1. Who is the father of American Nematology?

(a) Kuhn

(c) NA Cobb

(b) H Schacht

(d) TJ Burill

  1. For the first time who reported that a plant disease (fire blight of pear) was caused by a bacterium (Erwinia amylovora) in 1882

(a) Robert Koch

(b) EF Smith

(c) Kuhn

(d) TJ Burill

  1. Who is considered founder of virology?

(a) Beijerinck

(b) AE Mayer

(c) WM Stanley

(d) TO Diener

  1. The first Indian scientist who collected and identified fungi in India

(a) EJ Butler

(b) KR Kirtikar

(c) JF Dastur

(d) KC Mehta

  1. ‘Fungi and Disease in Plants’ was written in 1918 by Dastur

(a) JF

(b) BB Mundakur

(c) EJ Butler

(d) R. Prasad

  1. ‘Fungi and Plant Diseases’ was written by

(a) BB Mundakur

(b) JF Dastur

(c) G Rangaswami

(d) KC Mehta

  1. Select the wrong pair

(a) Hypertrophy: abnormal increase in size of organ,

(b) Hyperplasia: abnormal increase in number of cells of the organ,

(c) Atrophy: inhibition of growth or dwarfing,

(d) Necrosis: death of plant

  1. A bacteria which have a large number of flagella all over the cell is categorized in

(a) Atrichous

(b) Amphitrichous

(c) Lophotrichous

(d) Peritrichous

  1. In bacteria, variability is caused by

(a) Conjugation

(b) Transformation

(c) Transduction

(d) All of these

  1. The scientific name of potato blackleg is

(a) Erwinia amylovora

(b) Erwinia carotovora

(c) Agrobacterium tumefaciens

(d) Pseudomonas solanacearum

  1. JC Luthra and his associates developed the solar heat treatment of wheat seeds for the control of

(a) Black rust

(b) Loose smut

(c) Seed gall

(d) Brown rust

  1. Who done most of his work on rust diseases in India

(a) R Prasad

(b) KC Mehta

(c) BB Mundakur

(d) EJ Butler

  1. Citrus canker (lesions), which originated from China is caused by pathogen

(a) Xanthomonas campestris pv. citri

(b) Albugo candida

(c) Erwinia amylovora

(d) Claviceps fusiformis

  1. Select the wrong-pair :

(a) Black arm of cotton: X. campestris pv. malvacearum,

(b) Bacterial leaf blight of rice Xanthomonas campestris pv. oryzae,

(c) Red stripe of sugarcane : Pseudomonas rubrilineans,

(d) Ergot of bajra: Erwinia carotovora

  1. Common scab of potato can be controlled by reducing pH below 5.2 is caused by the pathogen

(a) Streptomyces scabies

(b) Streptomyces griseus

(c) Streptomyces aureofaciens

(d) Streptomyces flaveolus

  1. Citrus greening disease mainly confined to

(a) North India

(b) South India

(d) West India

(c) East India

  1. Select the disease(s) caused by Mycoplasma like organisms (MLO)

(a) Brinjal little leaf

(b) Rice yellow dwarf

(c) Sugarcane grassy shoot

(d) Sesamum phyllody

(e) All of these

  1. Select the organism which can not synthesize protein by own enzymes

(a) Bacteria

(b) Mycoplasma

(c) RLO

(d) Virus

  1. Bacteria leaf blight of rice caused by Xanthomonas oryzae is commonly controlled by seed treatment and foliar spray of the chemical in India

(a) Streptocycline

(b) Agrimycin

(c) Aretan

(d) RH-893

  1. Tundu disease (yellow ear rot) of wheat caused by Clavibacter tritici is usually associated with

(a) Heterodera avenae

(b) Anguina tritici

(c) Meloidogyne incognita

(d) Pratylenchulus sp.

  1. Sandal spike disease of sandal (Santalum album) is caused by

(a) Bacteria

(b) Fungi

(c) MLO

(d) Virus

  1. 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

  1. Tick out the sexual spores of fungi

(a) Chlamydospores

(b) Sporangiospores

(c) Zoospores

(d) Zygospores

  1. How many ascospores are enclosed in the mother cell, the ascomycetes ? ascus in

(a) 4

(b) 6

(c) 8

(d) 10

  1. The ascus ascomycetes having a globose shape but is a sexual fruit of no ostile (opening) is known as

(a) Cleistothecia

(c) Apothecia

(b) Perithecia

(d) All of these

  1. The perfect (sexual) stage not seen in

(a) Zygomycotina

(b) Ascomycotina

(c) Basidiomycotina

(d) Deuteromycotina

  1. The black wart disease of potato specially confined to Darjeeling hills is caused by pathogen

(a) Synchytrium endobioticum

(b) Plasmodiophora brassicae

(c) Sclerospora sorghi

(d) Plasmopora viticola

  1. ‘White blisters of crucifers’ is caused by pathogen

(a) Pythium debarynam

(b) Albugo candida

(c) Sclerospora sorghi

(d) Plasmopora viticola

  1. The perfect stage of Colletotrichum falcatum (causes red rot of sugarcane) is

(a) Glomerella tucumanensis

(b) Glomerella cingulata

(c) Glomerella lindemuthianum

(d) None of these

  1. Select the wrong pair

(a) Ergot of bajra: Claviceps fusifornis

(b) False smut of rice: C. oryzae

(c) Ergot of C. rye: purpurea

(d) Red rot of sugarcane: Colletotrichum gloeosporiodes

  1. In uredinales (rust fungi) basidia usually bearing how many numbers of basidiospores?

(a) 2

(b) 4

(c) 6

(d) 8

  1. Select the wrong pair

(a) Father of European Nematology:

(b) Father of World Nematology: NA Bastian,

(c) Father of Indian Nematology: MM Alam,

(d) Father of Plant Pathology: EJ Butler

  1. Who is the father of plant pathology in India ?

(a) EJ Butler

(b) KC Mehta

(c) BB Mundakur

(d) R Prasad

  1. 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

  1. The Downey mildew of bajra is caused by

(a) Sclerospora sorghi

(b) Sclerospora sacchari

(c) S. graminicola

(d) Perenospora parasitica

  1. The rust fungi completing their life cycle on one host are called

(a) Polymorphic

(b) Autoecious

(c) Heteroecious

(d) None of these

  1. 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

(c) Urediospores

(b) Basidiospores

(d) Teleutospores

  1. Promycelium in rust fungi bears

(a) Basidiospores

(b) Aeciospores

(c) Uredia

(d) Telia

  1. The disease damping off seedlings during nursery stage is caused by the pathogen

(a) Physoderma maydis

(b) Pythium aphanidermatum

(c) Pythium debaryanum

(d) Both (b) and (c)

  1. The optimum temperature for the attack of foot rot of papaya (Pythium aphanidermatum) is :

(a) 22 °C

(c) 32 °C

(b) 28 °C

(d) 36°C

  1. The effective control of late blight of
    potato is possible by use of

(a) Sanitation measures

(b) Spray of metalaxyl

(c) Bordeaux mixture

(d) All of these

  1. The bacterial colony is known as

(a) Spore

(b) Mycelium

(c) Ooze

(d) Hypha

  1. The gummosis disease of citrus which is caused by Phytophthora palmivora is identified by observing

(a) Death of shoot tip

(b) Root knot

(c) Chlorosis

(d) Oozing of gum

  1. 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

  1. Albugo candida produces

(a) Basidiospores

(b) Ascospores

(d) Oospores

(c) Zoospores

  1. The green ear or downey mildew of pearlmillet was first time reported in India by

(a) KC Mehta

(c) Mundakur

(b) EJ Butler

(d)` R. Prasad

  1. The downey mildew pearlmillet is primarily a disease of

(b) Air borne

(a) Seed borne

(d) Water borne

(c) Soil borne

  1. Stem galls of coriander (Coriandrum sativum) is caused by

(a) Protomyces macrosporus

(b) Plasmopara viticola

(c) Peronospora pisi

(d) None of these

  1. The symptoms of powdery mildew of pea (caused by Erysiphe polygoni) first appears on

(a) Stem

(c) Leaves

(b) Roots

(d) Flowers

  1. The powdery mildew of wheat is associated with fungi

(a) Erysiphe graminis sp. tritici

(b) E. graminis sp. hordei

(c) Erysiphe polygoni

(d) None of these

  1. The causal organism Erysiphe graminis 6 sp. tritici produces

(a) Apothecia

(b) Cleistothecia

(c) Perithecia

(d) Telia

  1. The disease caused by Leptosphaeria sacchari in sugarcane is

(a) Red rot

(c) Ring spot

(b) Black rot

(d) None of these

  1. The disease ergot of rye produces sclerotia is caused by

(a) Claviceps purpurea

(b) C. fusiformis

(c) Claviceps sativae

(d) All of these

  1. Select the disease in which small droplets of pinks or light honey coloured fluid (the honeydew stage) exudes from the spikelets

(a) Citrus canker

(b) Green ear diseases of bajra

(c) Ergot of bajra

(d) Bacterial blight of rice

  1. The management of ergot of bajra may be possible by adopting of

(a) Long crop rotations

(b) Keeping seed in 20% salt solution

(c) Spray of oxychloride + zineb

(d) All of these

  1. The most striking symptom of false smut of rice (Claviceps oryzae-sativae) is/are

(a) Transformation of individual kernels into large, velvety, green balls,

(b) Sometimes the size of kernel are more than twice the diameter of normal grain

(c) The colour of kernels finally changes to greenish black

(d) All of these

  1. Loose smut of wheat is

(a) Internally seed borne

(b) Externally seed borne

(c) Both (a) and (b)

(d) Not clearly defined

  1. Covered smut of barley (caused by Ustilago hordei) is/are

(a) Internally seed borne

(b) Externally seed borne

(c) Both (a) and (b)

(d) Not clearly defined

  1. Which fungicide give effective control of covered smut of barley ?

(a) Vitavax

(b) Ceresan

(c) Agrosan 5W

(d) Sulphur dust

  1. Loose smut of barley is/are

(a) Internally seed borne

(b) Externally seed borne

(c) Soil borne

(d) All of these

  1. The plants produce a whip like black shoot, often very long and much curved on itself in smut of sugarcane is caused by pathogen

(a) Ustilago nuda

(b) Ustilago titici

(c) Ustilago scitaminea

(d) Ustilago hordei

  1. The false smut of sugarcane can be controlled by adopting

(a) Avoid the practice of ratooning

(b) Disinfection of setts before planting

(c) Removal of smutted whips from the field

(d) All of these

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

(a) Vegetative stage

(b) Reproductive stage

(c) After flowering

(d) Before sowing

  1. Grain smut of sorghum is externally seed borne disease caused by pathogen

(a) Sphacelotheca reiliana

(b) Sphacelotheca cruenta

(c) Sphacelotheca sorghi

(d) Tolyposporium enrenbergii

  1. The smut of pearlmillet (caused by Tolyposporium penicillariae) is a

(a) Internally seed borne

(b) Externally seed borne

(c) Soil borne

(d) All of these

  1. The common bunt, stinking smut or hill bunt of wheat is caused by pathogen

(a) Tilletia tritici

(b) Tilletia foetida

(c) Both (a) and (b)

(d) Neovossia indica

  1. Karnal bunt of wheat first time in Karnal by Mitra in reported

(a) 1929

(b) 1931

(c) 1941

(d) 1951

  1. The Karnal bunt of wheat is

(a) Neovossia indica

(b) Tilletia horrida

(c) Urocystis tritici

(d) Ustilago tritici

  1. Karnal bunt of wheat gives foul smell in the field due to presence of volatile compound

(a) Tetramethyl amine

(b) Trimethyl amine

(c) Diallyl propyl sulphide

(d) Allyl propyl disulphide

  1. The causal organism Neovossia indica produces

(a) Urediospores

(b) Zoospores

(c) Oospores

(d) Teliospores

  1. The causal organism of bunt of rice is

(a) Urocystis tritici

(c) Neovossia horrida

(b) Tilletia foetida

(d) None of these

  1. The effective control of flag smut of wheat (Urocystis tritici) can be done by adopting of

(a) Use of resistant varieties

(b) Seed treatment

(c) Crop rotation

(d) All of these

  1. Black rust or stem rust of wheat is caused by

(a) Puccinia graminis tritici

(b) Puccinia striformis

(c) Puccinia recondita

(d) Melampsora lini

  1. Which type of spores of Puccinia graminis tritici infect the barberry plant ?

(a) Teliospores

(b) Urediospores

(d) Basidiospores

(c) Aeciospores

  1. In rust cycle the cereal host is infected by

(a) Urediospores

(c) Teliospores

(b) Aeciospores

(d) Basidiospores

  1. The yellow rust of wheat is caused by

(a) Puccinia striformis

(b) Puccinia recondita

(c) P. graminis tritici

(d) Puccinia hordei

  1. In India the leaf rust of coffee was first time recorded in

(a) 1856

(c) 1880

(b) 1870

(d) 1943

  1. Rust of linseed and flax (autoecious rust) is caused by

(a) Puccinia recondita

(b) P. striformis

(c) P. graminis tritici

(d) Melampsora lini

  1. The rust of linseed and flax can be completely controlled by spray of

(a) Borax

(c) Vitavax

(b) Dithane M-45

(d) Agrosan GN

  1. Early blight of potato produces

(a) Conidia

(b) Telia

(c) Uredia

(d) Acecia

  1. For the effective control of early blight of potato, which fungicide is most suitable

(a) Zineb

(c) Blitox-50

(b) Dithane M-45

(d) Difolatan

  1. Early blight of potato is

(a) Soil borne disease

(b) Air borne

(c) Seed borne

(d) All of the above

  1. Leaf spot or tikka disease of groundnut in/are caused by

(a) Cercospora arachidicola

(b) Cercosporidium personatum

(c) Both (a) and (b)

(d) Drechslera graminea

  1. Brown leaf spot disease of rice is caused by

(a) Drechslera oryzae

(b) Cercospora arachidicola

(c) Xanthomonas oryzae

(d) Pyricularia oryzae

  1. The fungus of Drechslera oryzae produces toxins which are highly toxic to rice seedling, name of such toxin is

(a) ABA

(b) Trimethyl amine

(c) Isobutylene

(d) Cochliobolin

  1. The pathogen of rice blast or ‘rotten neck’ is

(a) Ustilago tritici

(b) Pyricularia oryzae

(c) Alternaria alternata

(d) None of these

  1. Tea rust is caused by

(a) MLO

(b) Virus

(c) Bacteria

(d) Algae

  1. The Colletotrichum falcatum produces

(a) Zygospores

(b) Oospores

(c) Ascospores

(d) Conidiospores

  1. Wilt of pigeonpea is caused by

(a) Fusarium udum

(b) Gibberella indica

(c) Rhizopus nigricans

(d) Aspergillus flavus

  1. For the effective control of wilt, pigeonpea should be intercropped with

(a) Maize

(b) Pearlmillet

(c) Sorghum

(d) Mung

  1. The most important symptom of wilt of cotton (caused by Fusarium oxysporum sp. vasinfectum) is

(a) Necrosis

(b) Yellowing of tissues

(c) Discolouration of tissues and plugging of vessels by hyphae

(d) All of these

  1. Wilt disease of sugarcane was first time reported in India from

(a) Punjab

(b) Tamil Nadu

(c) Bihar

(d) Uttar Pradesh

  1. The pathogen responsible for charcoal rot of soybean is

(a) Ascochyta rabiei

(b) Macrophomina phaseolina

(c) Rhizoctonia solani

(d) Penicillium

Related Posts

Leave a Reply

Your email address will not be published.