Your cart is empty.
Practice Interactions - Evolution - Ecology and Evolution previous year questions organised from real papers, with year-wise coverage and clear topic navigation.
Every graph below is calculated only from this selection.
Year-wise coverage for Interactions. Each bar uses a separate theme-derived color.
How the classified questions are distributed by difficulty.
MCQ, numerical, multiple-select and other formats found in these papers.
Top subjects by unique question coverage.
Top topics across the included previous year papers.
Top subtopics inside this exact selection.
Question coverage for the most populated papers. Every active PYP paper remains listed below.
Newest papers appear first. Sort by year, question coverage or name.
| Paper | Year / session | Questions in this view | Open |
|---|---|---|---|
| Ecology and Evolution (EY) 2025 | 2025 | 3 | View paper |
| Ecology and Evolution (EY) 2024 | 2024 | 1 | View paper |
| Ecology and Evolution (EY) 2022 | 2022 | 3 | View paper |
| Ecology and Evolution (EY) 2020 | 2020 | 1 | View paper |
| Ecology and Evolution (EY) 2019 | 2019 | 1 | View paper |
| Ecology and Evolution (EY) 2018 | 2018 | 2 | View paper |
| Ecology and Evolution (EY) 2016 | 2016 | 2 | View paper |
Practice every matching question in batches of 20, with every available option.
Which of the following is an example of complete intrinsic post-zygotic reproductive isolation between two species P and Q?
An altruist provides help worth 10 units of fitness to a recipient, at a personal cost of 1 unit of fitness. As per kin-selection theory, the minimum value of genetic relatedness between the actors and the recipients that is necessary to maintain altruism in the population is ____ (answer up to 1 decimal place).
Under which of the following conditions is rapid pollen tubes growth most likely to evolve?
Hosts of parasites evolve effective immune responses to infection, which in turn results in those parasites evolving increased infectiousness towards the hosts. Which one of the following processes describes this type of interaction between hosts and parasites?
A butterfly species in a homogenous forest patch starts exhibiting assortative mating, such that spotted individuals always mate with each other and plain individuals always mate with each other. This trait is heritable, and spotted parents always produce spotted offspring and plain parents always produce plain offspring. Which one of the following forms of speciation could this prezygotic reproductive barrier most likely lead to?
Many insect species carry the endosymbiotic bacteria Wolbachia, which are maternally inherited. Wolbachia persist over time in these insect hosts by increasing the fitness of the infected host. This increased host fitness can lead to the fixation of Wolbachia in the host population, wherein all individuals carry it. Which one of the following statements describes a process that would NOT allow Wolbachia to become fixed in the host population?