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Practice Test 60 - High School Biology

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

  1. A class models a pond ecosystem with algae (photosynthesis + respiration) and fish (respiration only). Which description correctly connects photosynthesis and cellular respiration to show matter cycling and energy flow?
  2. Claim: Social behavior benefits individuals by increasing access to food. A student lists four observations as "evidence" for the claim: 1) In winter, animals were seen huddling together during cold nights. 2) In a foraging study, groups located food in 68% of searches, while solitary individuals located food in 34% of searches (same area and time of day). 3) A documentary showed one group sharing food after a hunt. 4) In an experiment, blocking communication signals in groups reduced food-finding success from 65% to 40%. Which option identifies the two most relevant pieces of evidence supporting the claim?
  3. In a food web, decomposers (like fungi and bacteria) break down dead organisms and wastes from all trophic levels. Which statement best describes the role of decomposers in relation to energy flow?
  4. A trait is suspected to be X-linked recessive. In several families, affected individuals are mostly male, and unaffected mothers sometimes have affected sons. Which statement best supports the X-linked recessive explanation (rather than autosomal recessive)?​
  5. An endangered bird nests only in a specific type of wetland. A conservation plan includes: - Restoring drained wetlands by reflooding and replanting native vegetation - Creating a protected nesting zone where human access is limited during breeding season - Captive breeding and releasing young birds into restored wetlands Which evaluation best explains why this plan is likely to be more effective than captive breeding alone?
  6. In a bacterial population, about 1% of cells have a heritable mutation that makes them resistant to a new antibiotic. When the antibiotic is used repeatedly, most non-resistant bacteria die, but resistant bacteria survive and reproduce. After many generations, about 90% of the population is resistant. Which option best explains how antibiotic resistance became an adaptation in this environment?
  7. DNA studies place whales and hippos as close relatives, and fossils show early whales had ankle bones similar in shape to those of even-toed hoofed mammals. Which statement best combines the fossil and molecular evidence?
  8. A forest food chain is: oak leaves (producer) → caterpillar (primary consumer) → robin (secondary consumer). The oak leaves capture about 12,000 units of energy. Approximately how many energy units are available to the robin level using the 10% rule?
  9. In cellular respiration, glucose is broken down to carbon dioxide (CO2) and water (H2O). Compared to glucose, CO2 and H2O are more chemically stable (lower-energy). What does this imply about the overall process?
  10. A population graph rises quickly and then becomes nearly horizontal at the top of the graph (it levels off). What does the leveling off MOST directly indicate?
  11. A student claims: "If there were no mutations, sexual reproduction would still create brand-new alleles every generation." Which response is most accurate?
  12. A recessive trait appears in one child even though neither parent shows the trait. In a simple dominant/recessive model, what does this most strongly suggest about the parents?
  13. A factory upstream releases wastewater containing a heavy metal into a river. Small aquatic organisms absorb the metal, and fish that eat many of these organisms build up even higher concentrations. Birds that eat the fish show the highest metal levels and reduced reproduction. Which process best describes this pattern through the food web?
  14. A coastal community reports that reef fish numbers and species richness have dropped after years of heavy fishing, especially of large predatory fish. Scientists propose creating a no-take marine reserve covering 25% of the reef, where all fishing is prohibited, while allowing fishing to continue outside the reserve. Which evaluation is most scientifically accurate about how effective this strategy is likely to be for preserving reef biodiversity?
  15. A student says, "Cells get energy by breaking the bonds in glucose." Which choice best completes this idea to correctly describe cellular respiration and ATP?
  16. A plant population was sampled after repeated frost events to measure the frequency of a frost-tolerance allele (F). Year: 2001, 2003, 2005, 2007, 2009 Number of severe frost nights: 1, 2, 4, 6, 7 F allele frequency: 0.12, 0.18, 0.31, 0.47, 0.60 Which interpretation best matches the pattern and the environmental data?
  17. Two siblings have similar genotypes for muscle-building potential. One sibling trains with resistance exercise for a year and gains noticeable muscle mass; the other does not exercise and gains little muscle. Which statement best describes the role of environment here?
  18. A teacher draws an energy flow arrow: Sunlight → leaf → glucose. What is the best interpretation of this arrow in terms of energy?
  19. In a population of lizards, the frequency of an allele (H) associated with heat tolerance was measured as average summer temperature increased. Year: 1990, 2000, 2010, 2020 Average summer temperature (°C): 28.0, 28.6, 29.4, 30.1 H allele frequency: 0.22, 0.34, 0.51, 0.67 Which statement best interprets these data?
  20. A student compares two processes: Process 1: monomers → polymer Process 2: polymer → monomers The student says Process 1 is how a plant builds starch from glucose. Which statement correctly describes Process 1?

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