Tag: plant diseases

Questions Related to plant diseases

In plants, mosaic formation, leaf rolling and curling, yellowing of plant parts, vein clearing, dwarfing and stunted growth, necrosis etc. are the symptoms of

plant diseases keeping diseases away biology

  1. bacterial diseases

  2. mycoplasmal diseases

  3. viral diseases

  4. fungal diseases.

Show answer
Correct Option: C
Explanation:

Cucumber mosaic virus causes yellowing and mottling in Gerbera leaves. The CMV disease is described by extreme chlorotic mosaic, greening of veins on leaves, shading breaking in florets achieved with blossom disfigurements, and poor development of the sprout.

So, the correct option is 'viral diseases'.

Which one of the following fungi has been found useful in the biological control of plant diseases?

plant diseases keeping diseases away biology

  1. Penicillium notatum

  2. Phytophthora parasitica

  3. Trichoderma viride

  4. Mucor mucedo

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Correct Option: A

A wheat plant is infected by the aecidiospores of black stem rust fungus produced on the alternate host. What is the correct sequence of the following stages in the disease cycle?
a. Uredo stage
b. Pycnidial stage
c. Basidial stage
d. Teleuto stage
e. Aecidial stage
Select the correct answer using the codes given.

plant diseases keeping diseases away biology

  1. $1, 4, 3, 5, 2$

  2. $1, 3, 4, 5, 2$

  3. $1, 2, 3, 4, 5$

  4. $1, 4, 3, 2, 5$

Show answer
Correct Option: A

The well-known famine in Ireland in the $40$s has been attributed mainly to the failure of the potato crop which was infected by.

plant diseases keeping diseases away biology

  1. Aleraria solani

  2. Phytophthora infestans

  3. Phytophtora parasitica

  4. Pythium aphanidermatum

Show answer
Correct Option: A

Biological control of some soil-borne plant diseases has been achieved through the use of __________.

plant diseases keeping diseases away biology

  1. Rhizobacteria

  2. Streptomyces

  3. Nostoc

  4. Micrococcus

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Correct Option: A

Which one of the following is a causal agent of wart disease of potato?

plant diseases keeping diseases away biology

  1. Synchytrium and endobioticum

  2. Plasmodiophora brassicae

  3. Spongospora subterranea

  4. Pseudomonas solanacearum

Show answer
Correct Option: A

Turnip mosaic disease is caused by

plant diseases keeping diseases away biology

  1. Bacteria

  2. Viruses

  3. Nematodes

  4. Fungi

Show answer
Correct Option: B
Explanation:

Turnip Mosaic Disease is caused by the Turnip Mosaic Virus (TuMV), a potyvirus belonging to family potyviridae, that infects majority of plants belonging to Cruciferae or Brasscicaceae. They virus can be transmitted through vectors - Aphids.

So, the correct answer is 'Viruses'

Which of the following diseases is caused by bacteria?

plant diseases keeping diseases away biology

  1. Tobacco mosaic

  2. Black rot of crucifers

  3. Red rot of sugarcane

  4. Late blight of potato

Show answer
Correct Option: B
Explanation:

Black rot of crucifers is caused by Xanthomonas campestris pv. campestris a bacterial disease common to all cruciferous plants like Broccoli, cabbage, Kale etc. Infecting the stem, leaf, inflorescence and roots.

So, the correct answer is 'Black rot of crucifers'

Pyricularia oryzae causes

plant diseases keeping diseases away biology

  1. Citrus canker

  2. Blast disease of rice

  3. Tungro disease of rice

  4. Tikka disease of groundnut

Show answer
Correct Option: B
Explanation:

Pyricularia oryzae is a fungus that causes rice blast that results in lesions on leaves, stems, peduncles, panicles, seeds, and even roots. 

A. Citrus canker is caused by the bacterium Xanthomonas axonopodis. 
B. Blast disease of rice is caused by Pyricularia oryzae.
C. Tungro disease of rice is caused by the virus pararetrovirus of the family Caulimoviridae.
D. Tikka disease of groundnut is caused by the Cercospora personata.
Hence, the correct answer is 'Blast disease of rice'

Which of the following diseases is caused by virus?

plant diseases keeping diseases away biology

  1. Tabacco mosaic

  2. Late blight of potato

  3. Turnip mosaic

  4. Both (a) and (c)

Show answer
Correct Option: D
Explanation:

Tobacco mosaic virus (TMV) is a rod shaped virus, infecting tobacco leaves. It symptoms are mottled appearance that is patches of yellow and green, dwarfing etc. It spreads by mechanical abrasion of the infected tissue with a healthy one.

Turnip mosaic virus (TuMV) is a virus that causes diseases in members of Cruciferae family. It is spread by aphids.
So, the correct answer is 'Both (a) and (c)'