Practice Test 55 - High School Biology

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

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1. Two populations (A and B) are graphed as population size vs. time. Curve A rises slowly at first, then increases rapidly, and then levels off near a constant value. Curve B starts low and keeps getting steeper without leveling off. Which statement correctly matches each curve to a growth pattern?
2. A cargo ship accidentally releases a non-native mussel species into a large freshwater lake. The mussels reproduce quickly and outcompete native mussels for space and food. Over time, native mussel populations drop. Which human impact is illustrated in this scenario?
3. Some animals in groups take turns being on the edge of the group while others stay in the center. Why might being in the center of a large group be safer than being alone?
4. A prairie contains many grass and wildflower species. During a drought, some plant species decline, but others are drought-tolerant and continue growing. A nearby lawn is mostly one grass species and turns brown across large areas during the same drought. Which statement best explains how biodiversity affects population stability here?
5. A table of energy available in a grassland shows: - Producers: 40,000 kJ - Primary consumers: 4,000 kJ - Secondary consumers: 400 kJ Using the 10% rule, approximately how much energy is available to tertiary consumers?
6. A student says, "When a plant makes a protein, it turns glucose into protein." Which correction best reflects atom rearrangement and element sources?
7. A researcher raises several genetically identical fish in two tanks. Tank 1 has high-quality food; Tank 2 has low-quality food. After 6 months, fish in Tank 1 are larger on average than fish in Tank 2. Which statement best describes what happened?
8. A student made this partial model for a long bike ride: Respiratory system 2 Circulatory system 2 Muscular system. Which additional arrow label would best show the return pathway that completes gas exchange in the model?
9. A student measured the heights (cm) of 25 seedlings and grouped them into bins: 10–12 cm: 2 seedlings 13–15 cm: 6 seedlings 16–18 cm: 9 seedlings 19–21 cm: 6 seedlings 22–24 cm: 2 seedlings Which statement best describes the distribution of seedling height?
10. A grassland energy pyramid shows that primary consumers contain 3,200 kcal. Using the 10% rule, how much energy was available at the producer level?
11. Cellular respiration can be summarized as: glucose + oxygen $\rightarrow$ carbon dioxide + water + energy. Which choice best describes what the cell does with the released energy?
12. In a deer herd, some individuals lift their heads and scan the area while others keep feeding. How does this group-living behavior benefit individual deer compared with living alone?
13. Red blood cells are specialized for oxygen transport and typically lack a nucleus, while white blood cells keep a nucleus and help fight infection. Both come from stem cells in bone marrow. Which idea best explains how both cell types can develop from the same starting cell?
14. Human activity can affect the carbon cycle. Which action most directly adds extra carbon to the atmosphere in a way that can disrupt the balance of the carbon cycle?
15. A mountain region has warmed over several decades. Scientists observe that a cold-adapted plant now grows only near the mountaintop, while it used to grow at lower elevations too. What is the most likely reason the plant's range has shifted upward?
16. Two siblings have the same parents but look different and have different traits. Which statement best connects meiosis to this observation (ignoring rare cases like identical twins)?
17. A student is learning that most homeostatic control uses negative feedback. Which description best matches negative feedback in homeostasis?
18. Why can the digestive system not, by itself, ensure that all body cells receive glucose from a meal?​
19. In a leaf cell, photosynthesis produces glucose. The cell can use glucose to build different macromolecules for different functions. Which statement correctly links synthesis of a glucose-based macromolecule to its function?
20. A student says, "Chromosomes are only present when a cell is dividing; when the cell is not dividing, it has DNA but no chromosomes." Which correction is most accurate?

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