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Practice Social Behaviour - Behavioural Ecology - Ecology and Evolution previous year questions organised from real papers, with year-wise coverage and clear topic navigation.
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Question coverage for the most populated papers. Every active PYP paper remains listed below.
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| Paper name | Year | Attempt | |
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Ecology and Evolution (EY) 20262026 | 2026 |
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Ecology and Evolution (EY) 20252025 | 2025 | |
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Ecology and Evolution (EY) 20242024 | 2024 | |
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Ecology and Evolution (EY) 20212021 | 2021 | |
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Ecology and Evolution (EY) 20202020 | 2020 | |
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Ecology and Evolution (EY) 20192019 | 2019 | |
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Ecology and Evolution (EY) 20182018 | 2018 | |
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Ecology and Evolution (EY) 20162016 | 2016 | |
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Ecology and Evolution (EY) 20142014 | 2014 | |
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Practice every matching question in batches of 20, with every available option.
Which of the following statements is LEAST likely to explain the evolution of dispersal?
Many bird species show cooperative breeding. Offspring are cared for by parents and other individuals (helpers) who are typically offspring from previous years. Which of the following is NOT an appropriate evolutionary explanation for why helpers do not leave and breed on their own?
Juvenile rhesus macaques, who have never seen a leopard before, can learn to show fear response if they see an adult react fearfully to a leopard. What kind of behavioural response is this?
Group living can have both benefits (such as protection from predators) and costs (such as competition for resources). The figure depicts net benefit to individuals as a function of group size. Consider a population with more than hundred individuals, where groups do not split, and individuals can choose to either join a group or remain solitary. Given this information, what is the typical group size predicted?
A certain rodent species shows territoriality, competes for space and food, and their population is at carrying capacity. In the figures, the area within the rectangles (i) to (iv) represents a completely homogenous habitat where resources are distributed throughout, and the grey polygons represent rodent home ranges. Which of the following patterns best represents the expected distribution of home ranges of the rodent species if individuals vary in competitive ability?
Under which one or more of the following conditions can altruism evolve in animal societies?
Given below is a table with ecological observations and processes.
| Ecological observations | Processes |
|---|---|
| P) Bright spotted pigmentation in guppy males in low predation habitats | I) Kin selection |
| Q) Vampire bats share blood meals | II) Sexual selection |
| R) Cooperative breeding in African weaver birds | III) Reciprocal altruism |
Fish schools in coral reefs can comprise multiple species that swim and forage together. Which one or more of the following options describe(s) potential fitness benefit(s) to individuals in a mixed-species group?
