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Plant Diseases (GATE - XL)

Description: Plant Pathology
Number of Questions: 15
Created by:
Tags: Plant Pathology diseases of important crops caused by fungi bacteria and viruses Botany GATE crop citrus bacteria fungi virus maize potato tomato sugarcane plant sorghum cucurbit tobacco CSIR NET microbes
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Which of the following citrus diseases are caused by Pseudomonas syringae?

  1. Bacterial spot
  2. Black pit
  3. Blast
  4. Citrus canker

  1. 1 and 2

  2. 1 and 4

  3. 2 and 3

  4. 2 and 4

  5. 3 and 4

Show answer
Correct Option: C
Explanation:

Bacterial spot and blast in citrus are caused by Xanthomonas campestris.

Which of the following statements is/are incorrect?

  1. Claviceps purpurea causes ergot of rye.
  2. Xanthomonas oryzae causes halo blight of oat.
  3. Alternaria solani causes late blight of potato.

  1. Only 1

  2. Only 2

  3. Only 3

  4. Both 2 and 3

  5. Both 1 and 2

Show answer
Correct Option: D
Explanation:

Both are false statements.

Identify the incorrect matching of plant disease and causative microorganism.

  1. Rapeseed stem canker: Leptosphaeria maculans

  2. Citrus canker: Xanthomonas axonopodis

  3. Apple canker: Neonectria galligena

  4. Grape canker: Eutypa lata

  5. Mulberry canker: Fusarium pini

Show answer
Correct Option: E
Explanation:

Mulberry canker is caused by the fungus Gibberella baccata. Pine pitch canker is caused by the fungus Fusarium pini.

Identify the incorrect matching.

  1. Angular leaf spot: Xanthomonas campestris

  2. Bacterial wilt: Erwinia tracheiphila

  3. Downy mildew: Pseudoperonospora cubensis

  4. Alternaria leaf blight: Alternaria cucumerina

  5. Crown and foot rot: Fusarium solani

Show answer
Correct Option: A
Explanation:

Angular leaf spot in cucurbits is caused by Pseudomonas amygdali.

All of the following diseases in hemp are caused by fungi, except

  1. black mildew

  2. brown blight

  3. fusarium wilt

  4. crown gall

  5. pink rot

Show answer
Correct Option: D
Explanation:

Crown gall in hemp is caused by bacterium Agrobacterium tumefaciens.

Charcoal rot is caused by

  1. Erysiphe cichoracearum

  2. Macrophomina phaseolina

  3. Pythium ultimum

  4. Glomerella glycines

  5. Alternaria alternata

Show answer
Correct Option: B
Explanation:

Macrophomina phaseolina is a Botryosphaeriaceae fungus.

Brown blight in tea is caused by

  1. Cylindrocladium lanceolatum and Exobasidium vexans

  2. Cylindrocladium lanceolatum and Glomerella cingulata

  3. Exobasidium vexans and Glomerella cingulata

  4. Glomerella cingulata and Colletotrichum gloeosporioides

  5. Colletotrichum gloeosporioides and Cylindrocladium lanceolatum

Show answer
Correct Option: D
Explanation:

Brown blight in tea is caused by Glomerella cingulata and Colletotrichum gloeosporioides.

Match the following:

 
Column I Column II
P. Bacterial canker 1. Clavibacter michiganensis
Q. Bacterial speck 2. Xanthomonas campestris
R. Bacterial spot 3. Pseudomonas syringae
S. Bacterial wilt 4. Ralstonia solanacearum

  1. P - 1; Q - 2; R - 3; S - 4

  2. P - 1; Q - 3; R - 2; S - 4

  3. P - 2; Q - 1; R - 4; S - 3

  4. P - 3; Q - 1; R - 2; S - 4

  5. P - 3; Q - 4; R - 2; S - 1

Show answer
Correct Option: B
Explanation:

Bacterial canker of tomato is caused by Clavibacter michiganensis. Bacterial speck of tomato is caused by Pseudomonas syringae. Bacterial spot of tomato is caused by Xanthomonas campestris. Bacterial wilt of tomato is caused by Ralstonia solanacearum.

Which of the following is a pair of viral diseases of cereals?

  1. Black point and common bunt

  2. Barley yellow dwarf and common bunt

  3. Barley yellow dwarf and high plains disease

  4. High plains disease and common bunt

  5. Black point and barley yellow dwarf

Show answer
Correct Option: C
Explanation:

Barley yellow dwarf is a plant disease caused by the barley yellow dwarf virus.

Which of the following cotton diseases is/are caused by a virus?

  1. Leaf curl
  2. Leaf crumple
  3. Leaf spot

  1. Only 1

  2. Only 2

  3. Only 3

  4. Both 1 and 2

  5. Both 2 and 3

Show answer
Correct Option: D
Explanation:

Leaf curl and leaf crumple diseases in cotton are caused by cotton leaf curl virus.

Match the following:

 
Group I Group II
P. Gray leaf spot I. Cercospora fusimaculans
Q. Latter leaf spot II. Cercospora sorghi
R. Oval leaf spot III. Ramulispora sorghicola
S. Rough leaf spot IV. Ascochyta sorghi

  1. P - III, Q - IV, R - II, S - I

  2. P - III, Q - I, R - II, S - IV

  3. P - II, Q - I, R - III, S - IV

  4. P - II, Q - IV, R - I, S - III

  5. P - I, Q - III, R - II, S - IV

Show answer
Correct Option: C
Explanation:

Gray leaf spot in sorghum is caused by fungus Cercospora sorghi. Latter leaf spot in sorghum is caused by fungus Cercospora fusimaculans. Oval leaf spot in sorghum is caused by fungus Ramulispora sorghicola. Rough leaf spot in sorghum is caused by fungus Ascochyta sorghi.

Match the following:

 
Group I Group II
P. Bacterial leaf blight 1. Pseudomonas andropogonis
Q. Bacterial leaf spot 2. Erwinia carotovora
R. Bacterial stalk 3. Pseudomonas avenae
S. Bacterial stripe 4. Xanthomonas campestris

  1. P - 1, Q - 4, R - 2, S - 3

  2. P - 3, Q - 2, R - 4, S - 1

  3. P - 4, Q - 3, R - 1, S - 2

  4. P - 3, Q - 4, R - 2, S - 1

  5. P - 2, Q - 4, R - 1, S - 3

Show answer
Correct Option: D
Explanation:

Bacterial leaf blight in maize is caused by Pseudomonas avenae. Bacterial leaf spot in maize is caused by Xanthomonas campestris. Bacterial stalk in maize is caused by Erwinia carotovora. Bacterial stripe in maize is caused by Pseudomonas andropogoni.

Match the columns:

 
Column I Column II
P. Angular leaf spot 1. Pseudomonas amygdali
Q. Wildfire disease 2. Pseudomonas syringae
R. Granville wilt 3. Ralstonia solanacearum
S. Hairy roots 4. Agrobacterium rhizogenes

  1. P - 1; Q - 2; R - 3; S - 4

  2. P - 1; Q - 3; R - 2; S - 4

  3. P - 2; Q - 1; R - 3; S - 4

  4. P - 3; Q - 2; R - 1; S - 4

  5. P - 1; Q - 2; R - 4; S - 3

Show answer
Correct Option: A
Explanation:

Angular leaf spot in tobacco is caused by bacterium Pseudomonas amygdali. Wildfire disease in tobacco is caused by bacterium Pseudomonas syringae. Granville wilt in tobacco is caused by bacterium Ralstonia solanacearum. Hairy roots in tobacco is caused by bacterium Agrobacterium rhizogenes.

Common root rot is a disease of wheat caused by

  1. Colletotrichum coccodes and Marssonina salicicola

  2. Fusarium culmorum and Fusarium graminearum

  3. Tilletia tritici and Tilletia laevis

  4. Tapesia yallundae and Tapesia acuformis

  5. Cochliobolus sativus and Claviceps purpurea

Show answer
Correct Option: B
Explanation:

Common root rot is a disease of wheat caused by one or more fungi. 

Match the following:

 
Group I Group II
P. Gumming disease 1. Herbaspirillum rubrisubalbicans
Q. Leaf scald 2. Xanthomonas albilineans
R. Mottled stripe 3. Acidovorax avenae
S. Red stripe 4. Xanthomonas axonopodis

  1. P - 1; Q - 3; R - 2; S - 4

  2. P - 2; Q - 3; R - 1; S - 4

  3. P - 3; Q - 2; R - 1; S - 4

  4. P - 3; Q - 4; R - 2; S - 1

  5. P - 4; Q - 2; R - 1; S - 3

Show answer
Correct Option: E
Explanation:

Gumming disease in sugarcane is caused by Xanthomonas axonopodis. Leaf scald in sugarcane is caused by Xanthomonas albilineans. Mottled stripe in sugarcane is caused by Herbaspirillum rubrisubalbicans. Red stripe in sugarcane is caused by Acidovorax avenae.

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