GATE XL format:mcq PYQs & Answers — Page 76

Questions 751–760 of 812. Imported answers require independent review unless marked reviewed.

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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Identify the CORRECT matching between group I and group II in relation to ecology

GROUP I P. The physical environment of an organism Q. The totality of the needs of a population for survival and its resource utilization R. The position of a species in a food chain S. Basic functional unit comprising living community and its physical environment

GROUP II

Trophic level

Habitat

Ecosystem

Niche

Ecological pyramid

Your answerChoose one option.

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

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

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

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

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Choose the CORRECT set of matches between group I and group II in relation to plant genetic transformation methods.

GROUP I P. Helium Q. Acetosyringone R. Polyethylene glycol S. Agarose embedding

GROUP II

Agrobacterium tumefaciens

Microinjection

Particle bombardment

Protoplast

Your answerChoose one option.

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

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

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

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

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Match the pathogen, disease caused and the affected plant in the CORRECT combination.

Pathogen P. Blumeria graminis Q. Magnaporthe grisea R. Venturia inaequalis S. Cercospora personata

Disease i. Blast disease ii. Powdery mildew iii. Tikka disease iv. Scab disease

Plant

Groundnut

Apple

Barley

Rice

Your answerChoose one option.

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

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

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

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

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Choose the plant part, its use and the source species in CORRECT combination.

Plant Part P. Bark Q. Leaf R. Capsule S. Stigma

Use i. Insecticide ii. Food colorant iii. Flavoring agent iv. Analgesic

Species

Crocus sativus

Papaver somniferum

Azadirachta indica

Cinnamomum zeylanicum

Your answerChoose one option.

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

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

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

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

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GATE XL format:mcq PYQs

Question 43

Question 44

Question 45

Question 46

Question 47

Question 48

Question 51

Question 52

Question 53

Question 54