AP Biology: Species Concepts Practice Questions
Practice species concepts with original AP Biology multiple-choice questions. Each item connects reproductive compatibility, ancestry, morphology, ecological niche, and limits of each concept with clear explanations.
Free original practice questions for study purposes. Open Exam Prep is an independent study resource and is not affiliated with, endorsed by, or sponsored by the makers of AP Exams.
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1. Two populations of frogs look similar, live in the same wetland, and court at the same time, but their offspring are sterile when they mate in captivity. Under the biological species concept, what does this evidence suggest?
Explanation. The biological species concept focuses on the ability to interbreed and produce viable, fertile offspring. Sterile hybrids indicate postzygotic reproductive isolation.
2. Which situation is a major limitation of the biological species concept?
Explanation. The biological species concept depends on reproductive compatibility, so it is difficult to apply to fossils, asexual lineages, and some geographically separated populations.
3. A botanist separates two plant groups mainly because they have consistently different leaf shapes, flower sizes, and seed structures. Which species concept is being emphasized most directly?
Explanation. The morphological species concept uses structural traits to distinguish species. It can be useful for fossils but may miss cryptic species or overemphasize variable traits.
4. Two insect lineages look almost identical, but DNA evidence shows each forms a distinct branch with its own recent common ancestor. Which concept best supports recognizing them as separate species?
Explanation. The phylogenetic species concept identifies species by shared ancestry and diagnosable evolutionary lineages, often using genetic evidence.
5. Two groups of bacteria occupy different metabolic niches in the same lake. One uses sulfur compounds, while the other depends on dissolved organic carbon. Which species concept is most relevant to this distinction?
Explanation. The ecological species concept emphasizes a lineage's ecological niche, including resource use and role in the environment. It can be especially useful for organisms where mating tests are not practical.
6. Which evidence would most directly support separating two bird populations under the biological species concept?
Explanation. Failure to produce viable offspring despite mating opportunities is direct evidence of reproductive isolation, the core criterion of the biological species concept.
7. Why can the morphological species concept incorrectly split one species into several species?
Explanation. A single species may show wide variation. If that variation is mistaken for species-level difference, the morphological concept can over-split groups.
8. A group of lizards includes two lineages that are nearly identical in appearance but do not interbreed in nature because they use different courtship signals. What term best describes this kind of hidden diversity?
Explanation. Cryptic species are distinct species that are difficult to distinguish by appearance alone. Behavioral, genetic, or reproductive data may reveal the separation.
9. Which statement best compares species concepts?
Explanation. Species boundaries can be complex. Reproductive, morphological, ecological, and phylogenetic evidence may complement each other or sometimes lead to different interpretations.
10. A paleontologist compares skull shape, tooth structure, and limb proportions in extinct mammals. Why is the morphological species concept especially useful here?
Explanation. For fossils, direct reproductive tests are generally impossible, so preserved structures provide important evidence for distinguishing species.
11. Two plant populations can hybridize, but hybrid offspring survive poorly in the habitats where the parent populations are adapted. Which conclusion is most reasonable?
Explanation. Some species exchange genes at low levels, but selection against hybrids can maintain boundaries. Species concepts often treat this as evidence of partial reproductive isolation.
12. A student says, "If two populations have different scientific names, they must meet every species concept equally well." What is the best correction?
Explanation. Species classification is evidence-based but can change with new data. Different concepts may highlight different aspects of evolutionary separation.
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FAQ
What species concepts should I know for AP Biology?
Know the biological, morphological, ecological, and phylogenetic species concepts, including what evidence each uses and when each concept has limitations.
Why is the biological species concept limited?
It relies on reproductive compatibility, so it is hard to apply to fossils, asexual organisms, and populations that are geographically separated or rarely observed mating.
How do species concepts connect to speciation?
Speciation creates evolutionary separation among populations. Species concepts are different frameworks for recognizing that separation using reproduction, traits, ancestry, or ecological niche.