Practice Test 12 - AP Environmental Science

20 questions. Answer them in any order, then submit to see your score and every explanation.

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1. An urban area implements tighter controls on gasoline vapor recovery at service stations and restricts use of certain solvent-based industrial coatings during summer afternoons. These measures primarily target which component of photochemical smog formation?
2. After installing urea-formaldehyde insulation, residents report eye irritation; which pollutant best explains these symptoms?
3. A cabbage farmer uses floating row covers, rotates crops, and releases parasitoids. They also keep records of pest counts and damage each week. Which IPM element is best represented by keeping weekly records?
4. Country D's age-structure diagram is inverted: the base (0–4) is narrower than the cohorts 40–44 and 45–49, and the diagram narrows again at very old ages. With no major immigration, which statement is most accurate?
5. A coastal water body has a measured salinity that varies from 0.5% after heavy rainfall to 2.8% during dry periods. The area is shallow, receives sunlight to the bottom, and supports high primary productivity and nursery habitat for juvenile fish due to nutrient inputs from a river. Which aquatic biome best fits this description?
6. A class is comparing layers by where weather occurs. Which layer contains the majority of atmospheric water vapor and is where clouds and storms form?
7. A country is transitioning away from subsistence farming. Child labor becomes less economically valuable, the cost of raising children in cities rises, and women have greater access to education and careers. Which rate change is most directly expected from these factors, and which demographic transition stage does that help define?
8. Which process most directly converts atmospheric nitrogen into forms plants can use within soils?
9. A country's age structure shows a bulge in ages 25–40 and a narrower base (0–10). What is the most likely short-term demographic effect? Context: A bulge in prime working ages can precede an aging population if births remain low.
10. A student reads: "Bromine from halons is especially effective at ozone destruction." If two compounds release equal numbers of halogen atoms in the stratosphere, why might halons be particularly concerning for ozone depletion?
11. A lab demonstration shows that a single chlorine radical can destroy many ozone molecules through a catalytic cycle (e.g., $\mathrm{Cl + O_3 \rightarrow ClO + O_2}$ and $\mathrm{ClO + O \rightarrow Cl + O_2}$). What is the best interpretation of why small amounts of chlorine can cause large ozone losses?
12. CO$_2$ rises; a country replaces coal with natural gas. What change is most likely in emissions per kWh generated?
13. A salt marsh chain is: cordgrass → snail → crab → raccoon. Decomposers act on dead cordgrass and animals. Which organism is a secondary consumer?
14. A report compares two regions: Region 1 TFR = 2.2 and Region 2 TFR = 2.0. Replacement level is 2.1. All else equal, which statement is most accurate?
15. Which DTM stage is most likely when a country has low death rates, a birth rate that is declining, and a population that is still growing due to population momentum?
16. A simple food chain is: phytoplankton → krill → penguin → leopard seal. Decomposers break down dead organisms from all trophic levels. If krill decline sharply due to warming waters, which outcome is most likely?
17. A school is investigating why a stream's temperature is higher in summer after nearby land was cleared for development. The cleared area is within the same watershed and lies along a tributary feeding the stream. Which explanation best links land use to the observed water-quality change?
18. Sea lice increase near salmon cages and infect wild juveniles; what mitigation best targets the ecological interaction?
19. In a thought experiment, CFC emissions stop worldwide in 2026. Which trend is most likely for Antarctic springtime ozone over the next several decades, assuming no major new ozone-depleting substances are introduced?
20. A mine's stream shows reduced dissolved oxygen after organic flocculant addition. Which mechanism best explains the drop?

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