GATE XL topic:ecology-environment PYQs & Answers

Questions 1–10 of 14. Imported answers require independent review unless marked reviewed.

If rabbits are introduced in an isolated grassland for the first time, which of the following growth curves (shown using dashed line) is/are theoretically possible population dynamics over time?

(P)

(Q)

Diagram for Life Sciences question 63 (figure 2)

(R)

Diagram for Life Sciences question 63 (figure 3)

(S)

Diagram for Life Sciences question 63 (figure 4)

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

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Match the types of ecological interactions in Group 1 with their respective definitions in Group 2.

Group 1: (P) Protocooperation; (Q) Commensalism; (R) Amensalism; (S) Helotism.

Group 2: (i) One species is harmed but the other is neither harmed nor benefited; (ii) A type of mutualism where one species is benefited more than the other; (iii) Both the species are benefited but the interaction between them is not obligatory; (iv) One species is benefited without harming the other

Your answerChoose one option.

P–ii, Q–iv, R–i, S–ii

P–ii, Q–i, R–iii, S–iv

P–i, Q–iv, R–ii, S–ii

P–iii, Q–i, R–iv, S–ii

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Match the types of ecological energy productivity in Group 1 with their respective definitions in Group 2.

Group 1: (P) Net primary productivity; (Q) Gross primary productivity; (R) Net productivity; (S) Secondary productivity.

Group 2: (i) Total amount of energy produced by autotrophs; (ii) Amount of energy stored by autotrophs after respiration; (iii) Net gain of energy by the consumers after energy loss; (iv) Unused amount of energy after consumption by heterotrophs.

Your answerChoose one option.

P–ii, Q–ii, R–iv, S–i

P–ii, Q–i, R–iii, S–iv

P–ii, Q–i, R–iv, S–iii

P–iv, Q–i, R–ii, S–iii

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Which of the following is/are part of marine ecosystem?

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

Open ocean

Chaparral

Deep sea

Estuaries

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Make CORRECT match between Group-I and Group-II, in relation to interaction between two species.

Group-I: P. Neutralism; Q. Allelopathy; R. Amensalism; S. Mutualism. Group-II: I. neither can survive under natural condition without the other; II. direct inhibition of one species by the other species using toxic compound; III. neither is affected by the association with the other; IV. one is inhibited and the other is not affected.

Your answerChoose one option.

P-I, Q-II, R-III, S-IV

P-III, Q-II, R-IV, S-I

P-IV, Q-III, R-II, S-I

P-III, Q-IV, R-II, S-I

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Match the following ecological terms with their appropriate definitions

Term | Definition P. Niche | i. Position of a species in food chain Q. Biota | ii. Place of a living organism in the biotic environment and its relates to food and enemies R. Trophic level | iii. Physical environment of an organism S. Habitat | iv. Totality of organisms (flora and fauna) in a given place or region

Your answerChoose one option.

P-i, Q-ii, R-iv, S-iii

P-ii, Q-iv, R-i, S-iii

P-iv, Q-iii, R-i, S-ii

P-iii, Q-i, R-ii, S-iv

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Arrange the following ‘water reservoirs of earth’ in decreasing order of water volume

P- Streams Q- Groundwater R- Glaciers S- Lakes and inland seas

Your answerChoose one option.

R-Q-S-P

P-Q-R-S

S-P-R-Q

R-P-Q-S

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Which one of the following ecosystems is represented by an inverted pyramid of numbers?

Your answerChoose one option.

Grassland

Pond

Desert

Parasitic forest

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Which of the following genera produces dimorphic seeds that help to broaden the time of germination in a variable habitat?

Your answerChoose one option.

Xanthium

Pisum

Mangifera

Linum

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Which of the following statements is TRUE for an ecotone?

Your answerChoose one option.

An ecotone is the synonym of an ecosystem

An ecotone is an interface zone of two or more ecosystems

An ecotone is a special feature of land biomes

An ecotone is exclusively characterized by decreased biodiversity

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GATE XL topic:ecology-environment PYQs

How to practice topic:ecology-environment

Question 63

Question 59

Question 60

Question 53

Question 61

Question 17

Question 18

Question 1

Question 1

Question 5