Olete.in – MCQs, Mock Tests & Government Job Prep | Agriculture Agriculture Plant Pathology Set-3

Taphrina causes the disease:

1. Chillies leaf curt
2. Tomato leaf curt
3. Peach leaf curt
4. Potato leaf curt

✅ Correct Answer: 3

Term commensalism shows:

1. Living together of the two species one of which is benefited by the association where as the other is neither beneficial nor harmful
2. Living together of two or more species of organism for mutual benefit
3. The joint action of the two-organisms on a carbohydrate resulting in the production of gas that is not formed by either organism cultivated separately
4. Living two organism together which are harmful to each other

✅ Correct Answer: 1

The anal and vulval openings in nematodes are located on:

1. Dorsal side
2. Lateral side
3. Ventral side
4. Dorso-lateral side

✅ Correct Answer: 3

The ______ botanist Micheli (1679-1737) was the first scientist who in 1729 studied fungi and saw their spores:

1. German
2. Dutch
3. Italian
4. Australian

✅ Correct Answer: 3

The casual organism for earcockle disease of wheat is:

1. Meloidogyne spp.
2. Heterodera avenae
3. Anguina tritici
4. None of these

✅ Correct Answer: 3

The class ends with:

1. Mycotina
2. Mycetes
3. Oomycetes
4. Zygomycetes

✅ Correct Answer: 2

The discovery of _____ mosaic by Meyer in 1886 was the beginning of studies on viruses as incitants of diseases in plants:

1. Tomato
2. Mungbean
3. Tobacco
4. Soyabean

✅ Correct Answer: 3

The epidermal cells of ____ plant become filled with toxic terpenoid aldehyde after they are few days old and these cells are rarely penetrated by pathogens:

1. Jute
2. Flax
3. Cotton
4. Okra

✅ Correct Answer: 3

The founder of mycology was:

1. Linnaeus
2. Anton de Bary
3. P.A. Micheli
4. Saccardo

✅ Correct Answer: 2

The genera Claviceps. Alternaria and Sclerospora are:

1. Bacteria
2. Fungi
3. MLO
4. Virus

✅ Correct Answer: 2

The microorganism used in brewing industry is:

1. Aspergillus
2. Yeast
3. Rhizobium
4. Virus

✅ Correct Answer: 2

The nematode Radopholus similes has shown the maximum numbers at a soil depth of:

1. 5-15 m
2. 20-30 m
3. 32-42 m
4. 1-4 m

✅ Correct Answer: 2

The organism included in order pernosporales cause the disease known as:

1. Downy mildew
2. Smut
3. Rust
4. Powdery mildew

✅ Correct Answer: 1

The organism lacking a well defined necleus are termed:

1. Fungi
2. Prokaryote
3. Eucaryote
4. Protozoa

✅ Correct Answer: 2

The organisms included in order Peronosporales cause the disease known as:

1. Rusts
2. Smut
3. Downy mildew
4. Powdery mildew

✅ Correct Answer: 1

The organisms lacking a well defined nucleus are termed:

1. Fungi
2. Prokaryote
3. Eukaryote
4. Protozoa

✅ Correct Answer: 2

The plant disease caused by an algae is:

1. Blue mold of tobacco
2. Red rust of tea
3. Aster yellows
4. None of the above

✅ Correct Answer: 2

The plant disease primarily responsive for the Great Bengal Famine of 1943 was:

1. Blast disease of rice
2. Bacterial blight of rice
3. Udbatta disease of rice
4. Brown leaf spot of rice

✅ Correct Answer: 4

The plant mycoplasmal diseases are transmitted by:

1. Aphids
2. Leaf hoppers
3. Mites
4. Above all

✅ Correct Answer: 2

The two important diseases of sugarcane would include:

1. Little leaf and bacterial wilt
2. Red rot and grassy shoot
3. Red rot and bund
4. Bakanae disease and stem canker

✅ Correct Answer: 2

Tilletia causes the disease:

1. Rust
2. Smut
3. Bunt
4. Karnal Bunt

✅ Correct Answer: 3

To which group Dithane Z-78 belongs:

1. Organomercurial
2. Dithiocarbomic acid
3. Heterocyclic nitrogen compound
4. None of these

✅ Correct Answer: 2

Choose the odd one:

1. Leafspot = Paddy Pigeonpea
2. Zonate leaf spot = Jawar
3. Red leaf = Sugarcane
4. Leaf blight = Wheat

✅ Correct Answer: 3

Tobacco mosaic virus was first reported by:

1. Smith
2. Martin
3. Mayer
4. Beijerinck

✅ Correct Answer: 3

Tobacco mosaic infections intity was isolated in pure crystalline form of protein by:

1. Stanley
2. Beijerinck
3. Iwanowsky
4. Bawden

✅ Correct Answer: 1

Tolyposorium penicillarie cause:

1. Smut of sugarcane
2. Grain smut of sorghum
3. Bajra smut
4. Head smut of sorghum

✅ Correct Answer: 3

Tomato leaf curl is caused by:

1. Bacteria
2. Fungi
3. Mycoplasma
4. Virus

✅ Correct Answer: 4

Transduction is a process of multiplication in:

1. Fungi
2. Bacteria
3. Bacteriophages
4. Nematode

✅ Correct Answer: 3

Trichodorus belongs to family:

1. Trichodoridae
2. Heteroderidae
3. Nacobbidae
4. Longidoridae

✅ Correct Answer: 1

Tundu disease of what is caused by:

1. Anguina
2. Corynebacterium
3. Both (a) & (b)
4. Heterodera

✅ Correct Answer: 3

Who proved that virus could pass through filters with pores small enough to retain bacteria?

1. Stanley
2. Ivanowski
3. Mayer
4. Barkley

✅ Correct Answer: 2

Ufra disease of rice is caused by:

1. Pratylenchus
2. Ditylenchus
3. Aphelenchoides
4. Heterodera

✅ Correct Answer: 2

Leaf curl of tobacco is caused by:

1. Nicotina virus Ca-i
2. Nicotina virus-10
3. MLO s
4. Viriod

✅ Correct Answer: 2

165. Uncinuls causes the disease:

1. Downy mildew
2. Powdery mildew
3. Blight
4. Wilt

✅ Correct Answer: 2

Used lense for the first time to study micro-organism:

1. Robert Koch
2. Antony Van Leeuwenhoeck
3. Louis Pasteur
4. Butler

✅ Correct Answer: 2

Virus is transmitted by nematode:

1. Globodera
2. Tylenchorhynchus
3. Angulna
4. Xiphinema

✅ Correct Answer: 4

Who is known as the father of nematology?

1. N.A. Cobb
2. G.Thorne
3. F.G.W. Jones
4. De-man

✅ Correct Answer: 1

When bacterial cells are subjected to unfavourable conditions they form:

1. Oospores
2. Zoospores
3. Endospores
4. Cyst

✅ Correct Answer: 3

Which are the cellulose attacking fungi at the time of decomposition of organic compound?

1. Trichoderma Aspergillus
2. Ganoderma Psalliotta
3. Albugo Puccinia
4. Pythium Macrophomina

✅ Correct Answer: 1

Which fungus produces aflatoxin?

1. Penicillium notatum
2. Aspergillus flavus
3. Albugo candida
4. Trichoderma viride

✅ Correct Answer: 2

Which fungus supresses various pathogenic fungi present in soil?

1. Pythium aphanidermatum
2. Psalliotta spp.
3. Macrophomina spp
4. Trichoderma viride

✅ Correct Answer: 2

Which is citrus namatode?

1. Hoplolaimus
2. Pratylenchus
3. Rotylenchulus
4. Tylenchus

✅ Correct Answer: 4

Which is sulphur bacteria?

1. Nitrosomonas
2. Cladethrix
3. Thiothrix
4. Bacillus

✅ Correct Answer: 2

Which is the root knot nematode?

1. Angunia
2. Heterodera
3. Meloidogyne
4. Tylenchorhynchus

✅ Correct Answer: 3

Which of the following nematicide is a carbamate?

1. DBCP
2. DD
3. Phorate
4. Aldicarb

✅ Correct Answer: 4

Which of the following nematodes attack above plant parts?

1. Pratylenchus
2. Anguina
3. Meloidogyne
4. Rotylenchulus

✅ Correct Answer: 2

Which of the nutrient is supplied by mycorrhiza to the plant?

1. Nitrogen
2. Phosphorus
3. Sulphur
4. Iron

✅ Correct Answer: 2

Which of them is a gram-positive bacterium?

1. Xanthomonas
2. Pseudomonas
3. Erwinia
4. Corynebacterium

✅ Correct Answer: 4

Which of them is a poisonous mushroom?

1. Agaricus
2. Volvariella
3. Peasurotus
4. Amanita

✅ Correct Answer: 4

Which one of the following groups consists of systemic fungicides?

1. Bavistin Topsin-M Captan
2. Plantvax Emisan Calisin
3. Vitavax Bavistin Calisin
4. Ziram Plantvax Blitox

✅ Correct Answer: 3

Which one of the following correctly define the period between inoculation and appearance of the first disease symptom?

1. Penetration period
2. Latent period
3. Incubation period
4. Infestion period

✅ Correct Answer: 2

Which one of the following helps in maintaining the shape of nematodes?

1. Pseudocoelomic fluid
2. Cuticle and muscles
3. Pseudocoelome
4. Annulation of cuticle

✅ Correct Answer: 1

Which one of the following is known as downy mildew fungus?

1. Erysiphe
2. Sclerospora
3. Taphrina
4. Urocystis

✅ Correct Answer: 2

Which one of the following is the best method of controlling ear cockle disease of wheat?

1. Application of solar heat
2. Mechanical separation of infected seed by floatation
3. Application of balanced dose of fertilizer
4. Treatment of seed with pesticide

✅ Correct Answer: 2

Which one of the following is the cause of spreading decline of citrus?

1. Citrus nematode
2. Burrowing nematode
3. Fungal diseases
4. Nutritional deficiency

✅ Correct Answer: 4

Which one of the following is the correct mode of infection in Ergot of bajra?

1. Shoot infection
2. Local infection of blossom
3. Seedling infection
4. Systematic infection

✅ Correct Answer: 2

Which one of the following is the correct order in which they appear during biocontrol operations?

1. Parasite Release Mass rearing Parasitism
2. Mass rearing Parasite Release Parasitism
3. Release Mass rearing Parasite Parasitism
4. Parasite Mass rearing Release Parasitism

✅ Correct Answer: 4

Which one of the following pairs is not correctly matched?

1. Karnal bunt - Neovossia horrida of wheat
2. False smut - Ustilaginoidea virens of rice
3. Hill bunt - Tilletia foetida wheat
4. Ear cockle - Anguina tritici wheat

✅ Correct Answer: 1

Which one of the following pairs of crop and disease is correctly matched?

1. Cabbage - Early blight
2. Cucumber - Club root
3. Potato - Black wart
4. Tomato - White rust

✅ Correct Answer: 2

Which one of the following remedies is to be suggested in case of failure of a manuallyoperated sprayer to retain pressure?

1. Tightening of loose nuts and clamps and replacement of gaskets
2. Tightening of the lid of the tank replacement of the gasket if necessary
3. Opening the nozzle and cleaning its various parts especially the orifice
4. Straightening the plunger rod if found bent

✅ Correct Answer: 2

Which one of the following sprayers could require the lowest volume of spray solution to cover a hectare of rice crop?

1. Power sprayer
2. Foot sprayer
3. Knapsack sprayer
4. Hand sprayer

✅ Correct Answer: 4

Which one of the following statements correctly defines economic threshold level?

1. The pest population level at which control measures should be taken to prevent the pest population from reaching economic injury level
2. The lowest pest population density that will cause economic damage
3. The optimum pest population density that will cause economic damage
4. The pest population level at which application of pest control measures will be uneconomic

✅ Correct Answer: 1

Which of the following statements correctly defines the alternate host of a pathogen/parasite?

1. A host on which a parasite attacks simultaneously with the main host
2. A host which grows in alternate season or year
3. One of the two kinds of hosts on which a parasitic fungus develops to complete its life cycle
4. A host on which the parasite does not attack in normal conditions

✅ Correct Answer: 3

Which one of the following tissue is most suitable for tissue culture to produce virus free plants of potato?

1. Leaf tissue
2. Pollen
3. Embryo-tissue
4. Meristem tip tissue

✅ Correct Answer: 1

Which shows the symbiotic relationship?

1. Rhizobium
2. Azotobactor
3. Clostridium
4. Nitrosomonas

✅ Correct Answer: 1

Which was the first plant bacterial disese reported?

1. Angular leaf spot of cotton
2. Citrus canker
3. Fire blight of apple
4. Bacterial blight of tomato

✅ Correct Answer: 3

Whip smut of sugarcane is caused by:

1. Ustilago nuda
2. Ustilago hordei
3. Urocystis agrophri
4. Ustilago sciteminae

✅ Correct Answer: 4

White rust of crucifer is caused by:

1. Puccinia
2. Albugo
3. Sclerospora
4. Peronospora

✅ Correct Answer: 2

Who for the first time discovered antibiotics?

1. Alexander Flemming
2. Stanley
3. Anton de Bary
4. Louis Pasteur

✅ Correct Answer: 1