GATE XL 2026 Paper 1 — page 20

Questions 58–60 of 122. Imported answers require review unless explicitly marked reviewed.

Correctly match the following plant diseases in Group-I with their causal organisms in Group-II.

Group-I: (P) Red rot of sugarcane; (Q) Tikka disease of groundnut; (R) Late blight of potato; (S) White rust of mustard.

Group-II: (1) Albugo candida; (2) Cercospora personata; (3) Plasmodiophora brassicae; (4) Phytophthora infestans; (5) Colletotrichum falcatum

Your answerChoose one option.

P–1; Q–2; R–4; S–3

P–5; Q–1; R–4; S–2

P–5; Q–2; R–4; S–1

P–5; Q–3; R–1; S–2

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Correctly match the following plant species in Group-I with their main economically important products in Group-II.

Group-I: (P) Gossypium arboreum; (Q) Dalbergia sissoo; (R) Hevea brasiliensis; (S) Pelargonium graveolens.

Group-II: (1) Rubber; (2) Spices; (3) Fibre; (4) Timber; (5) Essential oil

Your answerChoose one option.

P–3; Q–4; R–1; S–5

P–3; Q–4; R–1; S–2

P–2; Q–4; R–1; S–3

P–3; Q–1; R–2; S–5

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Two genes X and Y are involved in root development in such a way that all the following three homozygous mutants show rootless phenotype.

(i) Gain-of-function mutant of X (ii) Loss-of-function mutant of Y (iii) Double mutant of gain-of-function of X and loss-of-function of Y

Which one of the following genetic pathways best describes these observations?

Your answerChoose one option.

X suppresses Y and Y promotes root development

X promotes Y and Y promotes root development

X suppresses Y and Y suppresses root development

X promotes Y and Y suppresses root development

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2026 · Paper 1