GATE XL topic:plant-pathology PYQs & Answers — Page 2

Questions 11–20 of 23. Imported answers require independent review unless marked reviewed.

Match Group I (plant disease), Group II (causal organism) and Group III (affected plant) in CORRECT combination.

Group-I: P. Karnal Bunt; Q. Ergot; R. Late blight; S. Powdery mildew.

Group-II: I. Phytophthora infestans; II. Blumeria graminis; III. Neovossia indica; IV. Puccinia recondita; V. Claviceps purpurea; VI. Alternaria solani.

Group-III: a. Rice; b. Potato; c. Rye; d. Wheat; e. Barley; f. Brinjal

Your answerChoose one option.

P-III-a, Q-V-b, R-II-d, S-I-e

P-III-d, Q-V-c, R-II-e, S-IV-f

P-III-d, Q-V-c, R-I-b, S-II-e

P-V-c, Q-I-d, R-VI-b, S-II-e

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Which of the following is/are phanerogamic parasite(s)?

Your answerSelect all correct options. You can choose more than one.

Cuscuta reflexa

Orobanche cernua

Ocimum sanctum

Santalum album

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Phytoalexins play important role in plant defense against pathogens. Choose the INCORRECT option related to phytoalexins.

Your answerChoose one option.

Phytoalexins belong to secondary metabolites.

Phytoalexins have antifungal activity.

Phytoalexins are abundant in plants under normal condition.

Different hosts produce phytoalexins of varying chemical nature.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

To understand the mechanism of systemic acquired resistance (SAR), a team of researchers isolated a mutant with reduced SAR response. Sequencing of this mutant revealed homozygous mutations in two genes, X and Y. Which of the following experiment(s) would test whether the mutant phenotype is caused by mutation in either or both the genes?

Your answerSelect all correct options. You can choose more than one.

Complement the mutant with X or Y and analyze the phenotype in each case.

Complement the mutant with both X and Y and analyze the phenotype.

Cross the mutant with wild-type and analyze the segregation pattern of the phenotype.

Compare the expression of X and Y in mutant and wild-type plants.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Among the following, which best describes an organism that lives at the expense of other organisms, harmful but usually not killing?

Your answerChoose one option.

Predator

Symbiotic

Prey

Parasite

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

‘Bakanae’ disease or ‘foolish seedling’ disease is caused by

Your answerChoose one option.

Fungus

Bacterium

Virus

Mycoplasma

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Select the CORRECT combination by matching the disease, causal organism and the affected plant.

Disease	Causal organism	Affected plant
P. Stem rust	i. Cercospora personata	1. Wheat
Q. Wart disease	ii. Plasmopara viticola	2. Ground nut
R. Tikka/leaf spot	iii. Synchytrium endobioticum	3. Potato
S. Downy mildew	iv. Puccinia graminis	4. Grape
		5. Apple
		6. Rice

Choose the CORRECT combination:

Your answerChoose one option.

P-iv-1, Q-iii-3, R-ii-2, S-ii-4

P-ii-1, Q-i-6, R-iv-4, S-iii-2

P-iii-1, Q-iv-3, R-i-5, S-ii-4

P-iv-1, Q-ii-3, R-iii-2, S-i-5

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Arbuscules are highly branched structures, formed by

Your answerChoose one option.

ectomycorrhizae

endomycorrhizae

arbuscular mycorrhizae

monopoid mycorrhizae

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Match the disease with causative organism and affected crop

Your answerChoose one option.

P-3-i, Q-1-iv, R-2-iii, S-4-ii

P-3-ii, Q-1-iv, R-4-i, S-2-iii

P-4-ii, Q-1-i, R-3-iv, S-2-iii

P-2-iii, Q-3-ii, R-1-iv, S-4-i

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Select the CORRECT combination by matching the disease, affected plant and the causal organism.

Disease P. Black rot Q. Loose smut R. Panama wilt S. Bacterial fruit blight

Affected plant

Corn

Banana

Watermelon

Apple

Causal organism i. Fusarium oxysporum f.sp. cubense ii. Acidovorax avenae subsp. citrulli iii. Botryosphaeria obtusa iv. Ustilago maydis v. Plasmopara viticola vi. Venturia inaequalis

Your answerChoose one option.

P-2-v, Q-1-iv, R-3-iii, S-4-vi

P-2-ii, Q-1-iv, R-4-iii, S-3-i

P-4-iii, Q-1-iv, R-2-i, S-3-ii

P-4-vi, Q-1-iii, R-3-ii, S-2-v

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

GATE XL topic:plant-pathology PYQs

Question 60

Question 63

Question 5

Question 16

Question 6

Question 8

Question 15

Question 4

Question 15

Question 15