GATE XL discipline:life-sciences PYQs & Answers — Page 116

Questions 1151–1160 of 1235. Imported answers require independent review unless marked reviewed.

Two of the vir operons of Ti plasmid in Agrobacterium tumefaciens are constitutively expressed. Identify the CORRECT pair.

Your answerChoose one option.

virA and virG

virF and virH

virC and virD

virB and virE

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Which of the following fungi is an example of obligate biotrophic plant pathogen?

Your answerChoose one option.

Alternaria brassicicola

Botrytis cinerea

Puccinia triticina

Sclerotinia sclerotiorum

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The phenomenon where an organism lives at the expense of another organism by harming it but not killing, is called

Your answerChoose one option.

Commensalism

Predation

Symbiosis

Parasitism

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Which of the following is TRUE for K-strategist species?

Your answerChoose one option.

Produce relatively large number of offspring

Population often grow exponentially

Provide relatively little or no parental care to offspring

Occur in stable and predictable habitats

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Identify the INCORRECT statement with relation to plant secondary metabolites.

Your answerChoose one option.

Atropine is a member of indole alkaloids

Limonene is a cyclic terpene found in citrus plants

Green tea is rich in polyphenols

Cyanidin contributes to the red color in rose petals

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Choose the CORRECT set of matches between group I and group II in relation to nitrogen fixation and assimilation

GROUP I P. Nitrobacter Q. Nitrite reductase R. Nitrogenase S. Nitrate reductase

GROUP II

NO₃⁻ → NO₂⁻

N₂ → 2NH₃

NO₂⁻ → NH₄⁺

NO₂⁻ → NO₃⁻

Your answerChoose one option.

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

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

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

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

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Two plant cells M and N are lying side by side making direct contact. “M” has osmotic potential (Ψs) of -10 bar and pressure potential (Ψp) of 4 bar. On the other hand, “N” has osmotic potential (Ψs) of -12 bar and pressure potential (Ψp) of 5 bar.

Based on these data, what would be the direction of movement of water between M and N?

Your answerChoose one option.

M to N

N to M

There will be no movement

In both directions

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Two independent non-segregating recessive mutants (m1 and m2) display similar defects in petal formation. When they were crossed with each other (m1 × m2), all the F1 plants developed normal petals. In view of this observation, which of the following conclusions is CORRECT?

Your answerChoose one option.

Mutations in both m1 and m2 are in the same gene

Mutations in both m1 and m2 are in two separate genes

Inheritance is non-Mendelian

None of the above

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In a hypothetical trihybrid cross of three loci (viz. A, B, C), all were inherited in a complete dominant manner over their recessive alleles a, b, c, respectively. When a test cross between F1 and parent ‘aabbcc’ was performed, following genotypes of eight phenotypically distinct classes were observed with respective numbers

Class	Genotype	Number
1	ABC	412
2	abc	406
3	Abc	85
4	aBC	80
5	ABc	08
6	abC	07
7	AbC	01
8	aBc	01

The genetic distance (up to one decimal) between A and C loci will be ________ cM.

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In a typical sexually reproducing angiospermic plant, if an endosperm cell contains

nucleotide pairs of DNA, then a microspore of this plant will have ______

nucleotide pairs of DNA.

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GATE XL discipline:life-sciences PYQs

Question 41

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Question 50