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Plant Diseases

Description: Plant Diseases
Number of Questions: 15
Created by:
Tags: pravarch Common Diseases and Their Control Plant Breeding for Disease Resistance
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A virus-free clone can be obtained from a virus-infected plant by

  1. stem cutting

  2. meristem culture

  3. axenic culture

  4. leaf culture

  5. none of these

Show answer
Correct Option: B
Explanation:

A virus-free clone can be obtained from a virus-infected plant by meristem culture.

If a plant is infected with virus, it will show

  1. veinal chlorosis

  2. interveinal chlorosis

  3. uniform chlorosis

  4. tip necrosis

  5. none of these

Show answer
Correct Option: A
Explanation:

If a plant is infected with virus, it will show veinal chlorosis.

Potato mosaic virus is generally transmitted by

  1. insects

  2. mosquitoes

  3. wind

  4. diseased tubers

  5. none of these

Show answer
Correct Option: D
Explanation:

Potato mosaic virus is generally transmitted by diseased tubers.

Angular leaf spot of cotton is caused by

  1. fungus

  2. bacterium

  3. virus

  4. mycoplasma

  5. none of these

Show answer
Correct Option: B
Explanation:

Angular leaf spot of cotton is caused by bacterium.

Which of the following is the perfect stage of puccinia?

  1. Urediospore

  2. Aeciospore

  3. Basidiospore

  4. Teliospore

  5. None of these

Show answer
Correct Option: D
Explanation:

Teliospore is the thick-walled resting spore of some fungi from which the basidium arises.

The fungus causing coffee rust is

  1. autoecious

  2. dioecious

  3. heteroecious

  4. polymorphic

  5. none of these

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Correct Option: A
Explanation:

The fungus that causes coffee rust is autoecious.

The study of life cycle of a pathogen on its host plant is called

  1. pathology

  2. phytopathology

  3. etiology

  4. symptomatology

  5. none of these

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Correct Option: C
Explanation:

The study of the life cycle of a pathogen on its host plant is called etiology.

Which of the following is not a bacterial disease of carrot?

  1. Crown gall

  2. Canker

  3. Hairy root

  4. Scab

  5. Carrot bacteriosis

Show answer
Correct Option: B
Explanation:

This is not a bacterial disease of carrot, it is a fungal disease.

What causes rotten-neck disease of rice?

  1. Helminthosporium

  2. Xanthomonas oryzae

  3. Fusarium

  4. Pyricularia oryzae

  5. None of these

Show answer
Correct Option: D
Explanation:

Rotten-neck disease of rice is caused by pyricularia oryzae.

Which of the following is not a rice disease?

  1. Bacterial blight (Xanthomonas oryzae)

  2. Bacterial leaf streak (Xanthomonas oryzae)

  3. Foot rot (Erwinia chrysanthemi)

  4. Grain rot (Burkholderia glumae)

  5. None of these

Show answer
Correct Option: E
Explanation:

Since all the diseases are related to rice plant, so this is the correct answer.

Bordeaux mixture is so called after the name of

  1. a scientist

  2. a university

  3. a country

  4. a village

  5. none of these

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Correct Option: B
Explanation:

Bordeaux mixture is so called after the name of a university.

Which of the following statements is incorrect regarding pseudomonas syringae?

  1. Pseudomonas syringae is a gram negative bacterium.

  2. Pseudomonas syringae has a polar flagella.

  3. Pseudomonas syringae is a plant pathogen.

  4. Pseudomonas syringae tests positive for arginine dihydrolase and oxidase activity.

  5. None of these

Show answer
Correct Option: D
Explanation:

Pseudomonas syringae tests negative, not positive, for arginine dihydrolase and oxidase activity. Therefore, this statement is incorrect.

Which of the following is a heteroecious fungus?

  1. Rhizopus

  2. Puccinia

  3. Ustilago

  4. Fusarium

  5. None of these

Show answer
Correct Option: B
Explanation:

Puccinia is a heteroecious fungus.

The portable cause of bunchy top of banana is

  1. virus

  2. mycoplasma

  3. bacterium

  4. fungus

  5. none of these

Show answer
Correct Option: A
Explanation:

  The portable cause of 'bunchy top' of bananas is virus.

Which of the following is not correctly matched?

  1. Colletotrichum gloeosporioides - Causes coffee disease

  2. Erysiphe cichoracearum - Causes mint disease

  3. Fusicladium pisicola - Causes mango disease

  4. Erwinia cypripedii - Causes papaya disease

  5. Pythium paroecandrum - Causes carrot disease

Show answer
Correct Option: C
Explanation:

This pair is incorrectly matched as Fusicladium pisicola does not cause mango disease, it causes pea disease.

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