Pathology most important questions for competitive exams

Pathology most important questions for competitive exams – Part 2

  1. The incidence of black scurf of potato is more in

(a) Sandy soil

(b) Clay soil

(c) Alluvial soil

(d) Loam soil

  1. The attack of sheath blight of rice (caused by Rhizoctonia solani) is more during

(a) Germination

(b) Active tillering stage

(c) Flowering

(d) All of these

  1. The scientific name of burrowing nematode is

(a) Xiphinema sp.

(b) Longidorus sp.

(c) Meloidogyne sp.

(d) Radopholus sp.

  1. The nematodes are

(a) Monoblastic

(b) Duoblastic

(c) Triploblastic

(d) All of these

  1. The nematodes lack organs for

(a) Circulation

(b) Respiration

(c) Both (a) & (b)

(d) Excretory

  1. Which genus of nematodes has special types of nurse cell systems which s as source of continuous supply of nutrients to the nematodes ? serve

(a) Meloidogyne

(b) Heterodera

(c) Globodera

(d) All of these

  1. In the attack of which class of nematodes, presence of white to brown cysts projecting on the root surface is a characteristic symptom

(a) Longidorus

(b) Globodera

(c) Meloidogyne

(d) Trichodorus

  1. Select the nematode(s) which act as vectors of plant viruses

(a) Xiphinema index

(b) Longidorus

(c) Trichodorus

(d) All of these

  1. Mycoplasma cell membranes have how many layers

(a) One layer

(b) Two layers

(c) Three layers

(d) Four layers

  1. Citrus greening caused by the

(a) Fastidious bacteria

(b) Fungi

(c) Virus

(d) MLO

  1. The uredospores of Puccinia graminis are disseminated by

(a) Wind

(b) Animals

(c) Insect

(d) Birds

  1. G+C content of prokaryotes is

(a) 20%

(b) 30%

(c) 50%

(d) 70%

  1. Bacterial cell division mainly by

(a) Binary fission

(b) Fragment

(c) Budding

(d) None of these

  1. Shape of MLO is

(a) Rigid

(b) Cuboid

(c) Circular

(d) Polymorphic

  1. Cell wall lack microorganism

(a) Bacteria

(b) Virus

(c) Fungi

(d) MLO

  1. Teichoic acid found in

(a) Fungi

(b) Gram (+) bacteria

(c) Gram (-) bacteria

(d) Protozoa

  1. Father of microbiology

(a) Louis Pasteur

(b) Leuvanhoeck

(c) Kuch

(d) Mendal

  1. MLO first discovered by

(a) Louis Pasteur

(b) Kuch

(c) Doi

(d) Anupam Verma

  1. ‘Plant Pathology’ written by

(a) RS Singh

(b) Agrios

(c) VS Singh

(d) AP Sinha

  1. ‘Plant disease’ written by

(a) RS Singh

(b) Agrios

(c) BB Mundakur

(d) KC Mehta

  1. RSD is caused by

(a) Gram (-) fastidious bacteria

(b) Gram (+) fastidious bacteria

(c) Clavibacter xyli

(d) Both (b) and (c)

  1. MLO disease transmitted by

(a) Leaf hopper

(b) Aphid

(c) Whitefly

(d) Animals

  1. In north India and central India, the black rust inoculum cause from

(a) South

(b) Hilly area

(c) From USA

(d) From Nepal

  1. Teliospore of rust have germpores number

(a) 1

(b) 2

(c) 3

(d) 4

  1. Alternate host of black rust is

(a) Barberi

(b) Bajra

(c) Jowar

(d) Wheat

  1. Rice blast pathogen perfect stage is

(a) Pyricularia oryzae

(b) Magnaporthe grisea

(c) Helminthosporium

(d) Rhizoctonia

  1. Hot water treatment of seed is useful for control of

(a) Loose smut

(b) Covered smut

(c) Rust

(d) Powdery mildew

  1. Smut of maize caused by

(a) Ustilago tritici

(b) Ustilago maydis

(c) Ustilago hordei

(d) None of these

  1. Sterility mosaic disease of pigeonpea spread by

(a) Virus

(b) Aphid

(c) Whitefly

(d) Mites

  1. Virus capsid is made up of

(a) Protein

(b) Carbohydrate

(c) Lipid

(d) Nucleic acid

  1. Phyllody disease of sesamum spread by

(a) Leaf hopper

(b) Jassid

(d) Whitefly

  1. Fungi imperfecti includes in

(a) Deuteromycotina

(b) Basidiomycotina

(c) Ascomycotina

(d) Oomycetes

  1. Rust includes in

(a) Deuteromycotina

(b) Basidiomycotina

(c) Ascomycotina

(d) Oomycetes

  1. Smut includes in

(a) Deuteromycotina

(b) Basidiomycotina

(c) Ascomycotina

(d) Oomycetes

  1. Powdery mildew include in

(a) Deuteromycotina

(b) Basidiomycotina

(c) Ascomycotina

(d) Oomycetes

  1. Downy mildew include in

(a) Oomycetes

(b) Chytridiomycetes

(c) Zygomycetes

(d) Hypochytridiomycetes

  1. Downy mildew of pea caused by

(a) Perenospora pisi

(b) Albugo candida

(c) Erysiphae polygoni

(d) None of these

  1. Father of Indian Mycology

(a) EJ Butler

(b) KC Mehta

(c) Mundakur

(d) RS Singh

  1. Renowned scientist Dr. N.E. Borlaug belongs to

(a) Agronomy

(b) Genetics

(c) Entomology

(d) Plant Pathology

  1. In 2005 which pathological scientists Borlaug award got

(a) Rattan Lal

(b) VL Chopra

(c) CD Mayee

(d) S Nagarajan

  1. Which of the following bacteria generally used in genetic engineering for transfer of character from one organism to another?

(a) Bacillus thuringinesis

(b) Pseudomonas syringe

(c) Rhizobium meliloti

(d) Agrobacterium tumefaciens

  1. Micrografting is used to produce plants free from

(a) Virus

(b) RLO’s

(c) MLO’s

(d) Bacteria

  1. Black heart is a physiological disorder of

(a) Tomato

(b) Chilli

(c) Potato

(d) Cabbage

  1. Tungro disease of rice is spread by

(a) Nephotettix virescens

(b) Sogatella furcifera

(c) Nilaparvata lugens

(d) Thrips tabacci

  1. Panama wilt is a disease of

(a) Bamboo

(b) Mango

(c) Pineapple

(d) Banana

  1. Soil micro-organisms are most active at

(a) 18-20 °C

(b) 26-28 °C

(c) 30-32 °C

(d) 34-36 °C

  1. VAM is

(a) Bacteria

(b) Fungi

(c) Virus
(d) Algae

  1. Which of the of apple following is not a disease?

(a) Bird eye

(b) Powdery mildew

(c) Downey mildew

(d) Bunchy top

  1. ‘Buck eye rot’ is a disease of which crop

(a) Water chestnut

(b) Sweet potato

(c) Pods of garden pea

(d) Tomato fruits

  1. The major storage fungi that effects the food grain is

(a) Rhizobium

(b) Mucor

(c) Cercospora

(d) Aspergillus

  1. Loose smut is controlled by

(a) Soil treatment

(b) Seed treatment

(c) Chemical spray

(d) None of these

  1. Yellow leaf mosaic of bhindi crop spreads by

(a) Jassids

(b) Borers

(c) Jassid and borers

(d) None of these

  1. Yellow vein mosaic of Abelmoschus esculanta (okra) is spreads by

(a) Bemisia tabaci

(b) Aphids

(c) Leaf hopper

(d) Animals

  1. Yellow mosaic virus disease of moong spreads by

(a) Bemisia tabaci

(b) Aphir crassivora

(c) Nephotettix viruscens

(d) Amrasca bigulitula

  1. Heterodera avenne is

(a) Root knot nematode

(b) Cyst nematode

(c) Lesion nematode

(d) Lance nematode

  1. Which of the disease(s) induce floral abnormalities ?

(a) Downey mildew of mustard

(b) Green ear of bajra

(c) White rust of crucifers

(d) Both (b) and (c)

  1. Which one of the following microbial agents is being commercially exploited as biocontrol agent?

(a) Bacillus subtilis

(b) Penicillium notatum

(c) Sclerotium rolfsi

(d) Trichoderma viride

  1. Panama disease of banana is prevented by

(a) Spraying zinc carrier

(b) Spraying copper fungicide

(c) Application of lime to the soil

(d) Providing adequate irrigation

  1. Which one of the following fungicides is not systemic in nature ?

(a) Vitavax

(b) Thiram

(c) Benlate

(d) Topsin

  1. Which one of the following is/are entomopathogenic fungi ?

(a) Beauveria bassina

(b) Metarrhizium anisopliae

(c) Trichoderma harzianum

(d) Both (a) and (b)

  1. Which Penicillium species ‘Cheese’ making? used in

(a) Penicillium notatum

(b) Penicillium roqueforti

(c) Penicillium divaricatum

(d) Penicillium crysogenum

  1. ‘Little leaf’ in brinjal is caused by a

(a) Fungus

(b) Bacteria

(c) Virus

(d) Mycoplasma

  1. Bacterial diseases are controlled by use of chemicals

(a) Kelthane

(b) Fungicide

(c) Antibiotics

(d) Viricides

  1. Application of potash increases

(a) Resistance to water logging

(b) Frost resistance in plants Disease resistance in plants

(d) None of these

  1. Decomposition of organic matter in submerged soil is carried out by

(a) Bacteria

(b) Actinomycetes

(c) Fungi

(d) Earthworm

  1. Select the pair which is not correctly matched

(a) Longidorus – Needle nematode

(b) Pratylenchus – Lesion nematode

(c) Ditylenchus – Bulb nematode

(d) Tylenchulus – Cyst nematode

  1. The root – knot nematode generally have interaction with

(a) Pseudomonas solanacearum

(b) Xanthomonas citri

(c) Bacillus subtilis

(d) Streptomyces scabies

  1. The leaves of Pongamia glabra and Azadirachta indica reduces the population of

(a) Root-knot nematode

(b) Cyst nematode

(c) Burrowing nematode

(d) Bulb nematode

  1. Margosa is a highly effective product in reducing root-knot population belongs t

(a) Acacia arabica

(b) Azadirachta indica

(c) Citrullus colosynthes

(d) Pongamia glabra

  1. The nematode Heterodera avenae is confined to the gramineae family except one single legume

(a) Pisum sativum

(b) Cajanus cajan

(c) Vigna mungo

(d) Senebiera pinnatifolia

  1. The term virus was first time coined by

(a) Kuhn

(b) Beijerinck

(c) Stanley

(d) None of these

  1. Viruses contain

(a) RNA

(b) DNA

(c) Both RNA and DNA

(d) Either RNA or DNA, never both

  1. The mature particle of a plant virus in generally known as

(a) Capsid

(b) Viroid

(c) Virion

(d) Nucleocapsid

  1. The cauliflower mosaic virus particles contain

(a) RNA

(b) DNA

(c) Both (a) and (b)

(d) Either RNA or DNA

  1. All plant viruses (except cauliflower mosaic virus) contain

(a) DNA

(b) RNA

(c) Both RNA and DNA

(d) Either RNA or DNA

  1. The viruses which are usually helped or accompanied by smaller spherical particles of another serologically unrelated virus known as

(a) Satellite virus

(b) Gemini

(c) Virid Select the correct

(d) Capsid

  1. In plants buckling, puckering and blistering symptoms are produced by

(a) Bacteria

(c) Viruses

(b) Fungi

(d) Mycoplasma

  1. The fungi which transmit plant viruses belong to class

(a) Basidiomycetes

(b) Oomycetes

(c) Zygomyctes

(d) Plasmodiophoromycetes

  1. For quick and accurate detection of viruses can be done by



(c) IEM

(d) All of these

  1. Potato virus diseases are spread by

(a) Aphids

(b) Jassids

(c) Nematodes

(d) Tuber moth

  1. Leaf curl of tomato is spread by

(a) Jassids

(b) White fly

(c) Aphids

(d) Nematodes

  1. Bunchy top of papaya (caused by MLO) is spread by

(a) Nematodes

(b) Fungi

(c) White fly

(d) Leaf hoppers

  1. Yellow mosaic of legumes was first reported in India from

(a) Shimla

(b) Solan

(c) Delhi

(d) Kanpur

  1. The causal organism of bunchy top of banana is transmitted by

(a) Pentalonia nigronervosa

(b) Bemisia tabaci

(c) Lipaphis erisim:

(d) Pollen

  1. Potato spindle transmitted tuber disease is

(a) Mechanically

(b) Biologically

(c) Water

(d) All of these

  1. Ozone is toxic to expanding leaves of almost all types of plant at the concentration of equal or more than

(a) 0.1 ppm

(b) 0.2 ppm

(c) 0.3 ppm

(d) 0.5 ppm

  1. Sulphur dioxide is toxic to plant at or above

(a) 0.1-0.3 ppm

(b) 0.3-0.5 ppm

(c) 0.5-0.7 ppm

(d) 1 ppm

  1. Black heart of potato is the result of

(a) High temperature during transit

(b) Poor ventilation in the store

(c) High temperature of soil during growth and maturation of tubers in the crop field

(d) All of these

  1. The Bordeaux mixture was discovered by Millardet at Boardeaux in France in year

(a) 1807

(b) 1885

(c) 1905

(d) 1936

  1. The Bordeaux mixture was first time used for the control of

(a) Downey mildew of grape vines

(b) Powdery mildew cf pea

(c) Root rot of beet

(d) Damping of pea

  1. Burgundy mixture contains sodium carbonate in place of CaCO, as in Bordeaux mixture was discovered in

(a) 1885

(b) 1887

(c) 1890

(d) 1947

  1. Damping off and leaf blights are very effectively checked by

(a) Bordeaux mixture

(b) Burgundy mixture

(c) Thiram

(d) Copper oxychloride

  1. The organo-mercurials fungicides used for dry seed treatment usually contain mercury

(a) 0.5%

(b) 1.0%

(c) 2.0%

(d) 4.0%

  1. Dinocap (methyl heptyl dinitrophenyl crotonate) is sold in market as

(a) Bravo

(b) Dexon

(c) Botron

(d) Karathane

  1. Von Schmeling and Kulka first time demonstrated the systemic activity fungicides in year of

(a) 1956

(b) 1966

(c) 1972

(d) 1976

  1. Select the systemic fungicides

(a) Pyrimidines

(b) Triazoles

(c) Metalaxyl

(d) All of these

  1. Which systemic fungicide was first time and discovered by Von Schmeling Kulka ?

(a) Oxathiin

(b) Pyrimidines

(c) Benzimidazoles

(d) Quinones

  1. Tick out the pair which is wrongly matched

(a) Oxycarboxin Plantvax

(b) Carboxin

(c) MBC

(d) Benomyl Benlate

  1. Which antibiotic was first time demonstrated by Fleming (1929) ?

(a) Penicillin

(b) Streptomycin

(c) Tetracycline

(d) Gliotioxin

  1. Select the nematicides group which are non-fumigant in nature

(a) Methyl bromide

(b) Nemagon (DBCP)

(c) Vapam

(d) Aldicarb and Phorate

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