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Previous year question hub

Population Ecology - Ecology - Ecology and Evolution Previous Year Questions

Practice Population Ecology - Ecology - Ecology and Evolution previous year questions organised from real papers, with year-wise coverage and clear topic navigation.

11Papers
11Years
36Questions
1Topics

Population Ecology question pattern

Every graph below is calculated only from this selection.

Questions by year

Year-wise coverage for Population Ecology. Each bar uses a separate theme-derived color.

Difficulty distribution

How the classified questions are distributed by difficulty.

Easy 19 52.8%
Medium 17 47.2%

Question type distribution

MCQ, numerical, multiple-select and other formats found in these papers.

MCQ 24 66.7%
MSQ 6 16.7%
Numerical Answer Type (NAT) 5 13.9%
Fill in the blanks 1 2.8%

Subject weightage

Top subjects by unique question coverage.

Ecology and Evolution
36 Qs

Most asked topics

Top topics across the included previous year papers.

Ecology
36 Qs

Subtopic coverage

Top subtopics inside this exact selection.

Population Ecology
36 Qs

Paper coverage

Question coverage for the most populated papers. Every active PYP paper remains listed below.

Ecology and Evolution (EY) 2025
3 Qs
Ecology and Evolution (EY) 2024
6 Qs
Ecology and Evolution (EY) 2023
6 Qs
Ecology and Evolution (EY) 2022
2 Qs
Ecology and Evolution (EY) 2021
4 Qs
Ecology and Evolution (EY) 2020
2 Qs
Ecology and Evolution (EY) 2019
5 Qs
Ecology and Evolution (EY) 2018
4 Qs
Ecology and Evolution (EY) 2016
1 Qs
Ecology and Evolution (EY) 2015
1 Qs
Ecology and Evolution (EY) 2014
2 Qs

Included previous year papers

Newest papers appear first. Sort by year, question coverage or name.

PaperYear / sessionQuestions in this viewOpen
Ecology and Evolution (EY) 202520253View paper
Ecology and Evolution (EY) 202420246View paper
Ecology and Evolution (EY) 202320236View paper
Ecology and Evolution (EY) 202220222View paper
Ecology and Evolution (EY) 202120214View paper
Ecology and Evolution (EY) 202020202View paper
Ecology and Evolution (EY) 201920195View paper
Ecology and Evolution (EY) 201820184View paper
Ecology and Evolution (EY) 201620161View paper
Ecology and Evolution (EY) 201520151View paper
Ecology and Evolution (EY) 201420142View paper

All Population Ecology previous year questions

Practice every matching question in batches of 20, with every available option.

1
2014 · Ecology and Evolution · Ecology · Population Ecology
Ecology and Evolution (EY) 2014
The accompanying figure shows logistic population growth for two species in the same habitat.

Which of the following conclusions hold true?
(i) Species 1 has higher intrinsic growth rate
(ii) Species 2 has higher intrinsic growth rate
(iii) Carrying capacity for Species 1 is higher
(iv) Carrying capacity for Species 2 is higher
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2
2014 · Ecology and Evolution · Ecology · Population Ecology
Ecology and Evolution (EY) 2014
There are 19500 ants of a species on a small island of area 400 sq m. A student collects 1500 ants in 30 randomly placed pit-fall traps. She marks all of them with blue paint and releases them. Due to unusually low temperatures the following night, the ant population on the island experiences 10% mortality. The next day the student lays out another series of randomly placed pit-fall traps and collects 1183 ants. Assuming that (i) mortality is not affected by being painted, (ii) probability of falling into a trap is not affected by being painted, and (iii) probability of falling into a trap is not affected by the density of ants on the island, the expected number of ants with blue marks in the sample is ______________
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3
2015 · Ecology and Evolution · Ecology · Population Ecology
Ecology and Evolution (EY) 2015
In a population of asexual organisms that remains at a constant size, an individual is expected to have an average of ______ reproducing offspring.
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4
2018 · Ecology and Evolution · Ecology · Population Ecology
Ecology and Evolution (EY) 2018

Which of the following is NOT a characteristic of r-selected species?

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5
2018 · Ecology and Evolution · Ecology · Population Ecology
Ecology and Evolution (EY) 2018

Increased anthropogenic disturbance has resulted in an overall decrease in densities of trees and an increase in fragmentation of forests. Which of the following types of trees will have the greatest reduction in reproductive success?

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6
2018 · Ecology and Evolution · Ecology · Population Ecology
Ecology and Evolution (EY) 2018
The rate of population growth (dN/dt) over time (t) is shown below.
For the above population, which of the following plots of population (Popn.) size (N) vs. time (t) is CORRECT?
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7
2018 · Ecology and Evolution · Ecology · Population Ecology
Ecology and Evolution (EY) 2018

A population grows from a size of 100 individuals at t = 0, to 1000 individuals at t = 100, following density-independent growth. The ratio of per-capita growth rates at the initial (at t = 0) to the final (t = 100) time is ____.

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8
2019 · Ecology and Evolution · Ecology · Population Ecology
Ecology and Evolution (EY) 2019

Which of the following plots describes the expected relationship between population size (y-axis) and generation time (x-axis) in vertebrates? Here, each data point represents a different vertebrate species and the generation time is defined as the average interval between two generations.

Question diagram

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9
2019 · Ecology and Evolution · Ecology · Population Ecology
Ecology and Evolution (EY) 2019
To estimate the number of foxes in an area, a researcher conducted a mark-recapture survey. In the first survey, he caught and marked 90 foxes. In his second survey a week later, he caught 120 foxes of which 40 were marked (recaptures). If you are told that the actual number of foxes in this area is 400, which of the following is a plausible explanation for the anomaly in the researcher's data?
Open complete paper
10
2019 · Ecology and Evolution · Ecology · Population Ecology
Ecology and Evolution (EY) 2019
In a closed population following logistic growth, per capita birth rate \(b\) and per capita death rate \(d\) vary with population size \(N\) as \(b = 0.1 - 0.0001N\) and \(d = 0.01 + 0.00002N\), respectively. The carrying capacity \(K\) of this population is ________ individuals.
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11
2019 · Ecology and Evolution · Ecology · Population Ecology
Ecology and Evolution (EY) 2019
A population of birds has a 3:2 male to female adult sex ratio at the beginning of the breeding season. During the breeding season, every female produces 8 eggs of which 4 survive to become juveniles. A census at the end of the breeding season accurately estimates the bird population to be 1300 individuals. Assuming no deaths, the number of adult males in this population is ________ individuals.
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12
2019 · Ecology and Evolution · Ecology · Population Ecology
Ecology and Evolution (EY) 2019
A bacterial population grows from \(10^6\) cells to \(5.5 \times 10^7\) cells in 20 minutes. Assuming that the growth was not resource limited, the per-capita growth rate of bacteria is ________ per minute (round off to 2 decimal places).

Question diagram

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13
2020 · Ecology and Evolution · Ecology · Population Ecology
Ecology and Evolution (EY) 2020
In marine fauna, Pelagic Larval Duration (PLD) or the amount of time that larvae spend swimming or drifting in the water column affects their dispersal distance. Successful establishment of the larvae on a substrate also depends on finding a suitable habitat after dispersal, which is influenced by whether the habitat is patchy or continuous. Which of the following species will have the lowest population genetic structure (\(F_{ST}\)) across the same spatial scale?
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14
2020 · Ecology and Evolution · Ecology · Population Ecology
Ecology and Evolution (EY) 2020

A population of unicorns is growing over time, but its rate of growth is declining. Which of the following graphs best represents this pattern of growth?

Question diagram

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15
2021 · Ecology and Evolution · Ecology · Population Ecology
Ecology and Evolution (EY) 2021
The probability of local extinction increases with body size when there is forest degradation, loss, and fragmentation. Consider the following hypotheses for the vulnerability of larger-bodied species:
(P) Larger-bodied species tend to have smaller population sizes.
(Q) Larger-bodied species require larger territories/home ranges.
(R) Larger-bodied species have higher absolute resource and energy requirements.
Which one of the following options correctly lists all potential reasons for the vulnerability of larger-bodied species?
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16
2021 · Ecology and Evolution · Ecology · Population Ecology
Ecology and Evolution (EY) 2021
The effective population size of a sexually reproducing, diploid, animal species will be highest when the sex ratio (number of reproducing males / number of reproducing females) is
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17
2021 · Ecology and Evolution · Ecology · Population Ecology
Ecology and Evolution (EY) 2021
Demographic stochasticity introduces random variation in population growth because
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18
2021 · Ecology and Evolution · Ecology · Population Ecology
Ecology and Evolution (EY) 2021
Consider a population that shows logistic growth of the form \[ \frac{dN}{dt} = rN \left(1 - \frac{N}{K}\right) \] where \( \frac{dN}{dt} \) is the population growth rate, \( r \) is the instantaneous rate of increase, \( K \) is the carrying capacity and \( N \) is the population size.
For such a population (\( N > 0 \)), which one of the following graphs shows the correct relationship between per capita growth rate (\( \frac{1}{N} \frac{dN}{dt} \)) on the y-axis, and population size (\( N \)) on the x-axis?
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19
2024 · Ecology and Evolution · Ecology · Population Ecology
Ecology and Evolution (EY) 2024

A classical metapopulation at equilibrium is made up of local populations with

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20
2024 · Ecology and Evolution · Ecology · Population Ecology
Ecology and Evolution (EY) 2024

The population size at which net recruitment is the highest is also when the greatest amount can be harvested, while ensuring the long-term survival of the population. The amount harvested at this population size is known as

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Showing 20 of 36 questions