Tag: keeping diseases away

Questions Related to keeping diseases away

Crown gall symptoms are present in ______________.

plant diseases keeping diseases away biology

  1. Peas, apple and sugarcane

  2. Pear, grapes and sugarcane

  3. Apple, grapes and sugarcane

  4. Pear, apple and grapes

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Correct Option: A

Consider the following events.
a. Germ tube formation
b. Aspersoria formation
c. Penetration
d. Haustoria's formation.
The correct sequence in which these events take place during plant infection is?

plant diseases keeping diseases away biology

  1. $2, 1, 4, 3$

  2. $2, 3, 1, 4$

  3. $1, 2, 3, 4$

  4. $1, 2, 4, 3$

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Correct Option: A

Crown gall disease enhances ________________.

plant diseases keeping diseases away biology

  1. Meristematic activity

  2. Development of chloroplasts

  3. Reduction in leaf size

  4. Alteration in the morphology of flowers

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Correct Option: A

Which one of the following diseases is caused by mycoplasma-like organism?

plant diseases keeping diseases away biology

  1. Sugarcane mosaic disease

  2. Wilt disease of sugarcane

  3. Ring spot of sugarcane

  4. Grassy shoot of sugarcane

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Correct Option: A

Which of the following is not a viral disease of plants?

plant diseases keeping diseases away biology

  1. Red rot of sugarcane

  2. Tobacco mosaic disease

  3. Leaf curl of tomato

  4. Tristeza disease of citrus

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Correct Option: A
Explanation:

Red decay is the most widely recognized infection of sugarcane, caused by the growth Colletotrichum falcatum Went. 

So, the correct option is 'Red rot of sugarcane'.

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.

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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

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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