Life Sciences
GATE XL branch:xl PYQs
Build your understanding with focused practice from past exam papers.
Questions 51–60 of 1235. Imported answers require independent review unless marked reviewed.
Question 51
Open questionXL-RMCQ1 markNeeds review
Which one of the following terms best describes the plants that are adapted to grow in acidic soil?
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Open questionXL-RMSQ1 markNeeds review
Which of the following plant genera is/are example(s) of partial stem parasite?
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Open questionXL-RMSQ1 markNeeds review
Which of the following amino acids contain(s) only one chiral center?
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Open questionXL-RNAT1 markNeeds review
If an endosperm cell of a typical diploid angiosperm species has 15 chromosomes, then the number of chromosomes in a microspore mother cell of this species under normal circumstances would be__________ (in integer).
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Open questionXL-RMCQ2 marksNeeds review
Which one of the following class(es) of genes, when deleted, would result in sepal formation in all the floral whorls of Arabidopsis, as per the rules of the typical ABC model of floral organ patterning?
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Open questionXL-RMCQ2 marksNeeds review
Correctly match the following molecular assemblies in Group-I with their functions in Group-II.
Group-I:
(P) Photosystem I
(Q) Photosystem II
(R) Cytochrome b₆f complex
(S) CF₀ – CF₁ complex
Group-II:
(1) Utilizes proton gradient for ATP synthesis
(2) Transfers electron from reduced plastoquinone to oxidized plastocyanin
(3) Drives transfer of electron from plastocyanin to ferredoxin
(4) Oxidizes H₂O and reduces plastoquinone
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Open questionXL-RMCQ2 marksNeeds review
Correctly match the following secondary metabolites in Group-I with their chemical classes in Group-II.
Group-I:
(P) Codeine
(Q) Podophyllotoxin
(R) Resveratrol
(S) Linamarin
(T) Limonene
Group-II:
(1) Flavones
(2) Alkaloids
(3) Lignans
(4) Monoterpenes
(5) Cyanogenic glycosides
(6) Stilbenes
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Open questionXL-RMCQ2 marksNeeds review
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
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Open questionXL-RMCQ2 marksNeeds review
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
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Open questionXL-RMCQ2 marksNeeds review
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?
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