Life Science & Scientific Inquiry — Final exam

Parent / teacher answer key

Course-authored study paper with accessible keys. Use two flexible 45-minute blocks for the midterm, three for the cumulative final, and one for the optional sample. The questions revisit taught ideas and cases; these are not secure official school tests. Feedback has a separate session.

40 questions · 120 points · suggested 135 minutes

Student instructions

Use the supplied records; a glossary, notes, and calculator are permitted.
Explain briefly and show calculation steps with units; a labeled diagram or supported oral response can be accepted where appropriate.
Attempt responses before opening the worked key.
The suggested timing can be extended for reading and writing needs; mark reasoning rather than speed or exact model wording.

Science inquiry and calculation notes

Task	Method
Change	Final value minus initial value, with units.
Mean	Sum all values and divide by the number of values.
Percentage	Part divided by total, multiplied by 100.
Percentage points	Subtract two percentage values; distinguish from relative percent change.
Model	Label quantities, relationships, assumptions, and omissions.
Explanation	Claim + relevant evidence + biological reasoning + a limitation.

Coverage and marks

Chapter	Questions	Points
Scientific Inquiry & Diversity of Life	1, 2, 3, 4, 5	15
Cells, Transport & Cellular Energy	6, 7, 8, 9, 10	15
Body Organization, Transport & Movement	11, 12, 13, 14, 15	15
Coordination, Defense & Reproduction	16, 17, 18, 19, 20	15
Genes, Cell Division & Heredity	21, 22, 23, 24, 25	15
Ecosystems, Matter & Energy	26, 27, 28, 29, 30	15
Ecological Evidence & Environmental Design	31, 32, 33, 34, 35	15
Evolution, Evidence & Life History	36, 37, 38, 39, 40	15

Name: ____________________ Date: ____________________

Question 1 · 3 points

Illustrative record: Group A receives 10 mL daily and bright light; Group B receives 5 mL and dim light. After seven days, A gains 4 cm and B gains 1 cm. Identify the intended variable, measured outcome, and confound. Propose a fairer comparison and explain what the current data do establish.

Question 2 · 3 points

Illustrative image record: a 4 cm scale bar represents 200 micrometers; the cell image spans 1.2 cm. A microscope setting lists a 10× eyepiece and a 40× objective. Calculate estimated cell length and total magnification. Explain why these are different quantities and state a calibration assumption.

Question 3 · 3 points

Illustrative records: Treatment A height gains are 3, 4, and 5 cm; B gains are 1, 4, and 7 cm under the same stated interval. Calculate the means and numerical ranges. Describe one similarity, one difference, and what the summaries cannot establish.

Question 4 · 3 points

Illustrative observation: covered soil loses 5 g over a day; uncovered soil loses 12 g in the same setting. Starting water, container, and temperature are stated comparable. A claim says a cover always prevents all evaporation. Write a better claim, cite numerical evidence, explain a plausible mechanism, and identify a limit.

Question 5 · 3 points

Illustrative records: A is a seed with cells that later germinates; B is a battery toy that moves; C is a bacterium with a membrane and DNA but no enclosed nucleus. Use several characteristics to classify living status and explain why movement and a nucleus are not sufficient tests.

Question 6 · 3 points

Illustrative record: a living cell divides into two cells; each later divides once. A student claims the resulting four cells must be four times the original mass. Use cell theory to explain the number change and evaluate the mass claim.

Question 7 · 3 points

Illustrative cell record: the membrane is damaged and substances leak outward; ribosomes remain visible. A draft says visible ribosomes prove the whole cell functions normally. Explain the membrane’s role, evaluate the draft, and identify a useful further observation.

Question 8 · 3 points

Illustrative records: A has wall, enclosed nucleus, and chloroplasts; B has wall and DNA without an enclosed nucleus; C has membrane and enclosed nucleus without a wall. Identify categories supported by the combination of features and qualify the conclusions.

Question 9 · 3 points

Illustrative model: equal-pressure compartments A and B start with equal volumes; A has 5 nonpenetrating solute particles per volume unit and B has 10. Water can cross; solute cannot. Predict initial net water movement, identify what crosses, and explain why equilibrium need not mean no motion.

Question 10 · 3 points

Illustrative sealed-chamber data for a short study: carbon dioxide reading begins at 400 units, falls to 350 under light, and rises to 370 during a later dark interval. Readings share one calibrated unit; plant condition and temperature are otherwise stated comparable. Calculate both changes and explain them through net processes without claiming either process was observed directly.

Question 11 · 3 points

Illustrative model: digestion makes small food molecules available; an intestinal surface absorbs them; circulation transports them; muscle cells use materials and energy during contraction. Identify relevant levels of organization and explain why no listed system independently completes the entire process.

Question 12 · 3 points

Illustrative comparison: Sample A remains in one large piece; equal-mass Sample B is divided into small pieces. Both experience the same stated enzyme conditions; B breaks down faster. Explain a surface-area mechanism, distinguish observation from inference, and connect digestion with absorption.

Question 13 · 3 points

Illustrative draft: air enters lungs; oxygen then moves directly from lungs to every muscle cell; no vessels or heart are drawn. Repair the pathway, label gas exchanges, and distinguish the pathway from cellular respiration.

Question 14 · 3 points

Illustrative paper hinge: String A bends a joint when pulled; String B straightens it when pulled. The hinge and attachments are unchanged. Explain the represented mechanism, connect it with muscles, and state two limits of the analogy.

Question 15 · 3 points

Illustrative processing record for one model interval: 100 water units enter a filtrate; 96 return to the blood pathway; 4 leave through the urine pathway. Check the model balance, calculate the returned fraction, and explain why it is not a real intake recommendation.

Question 16 · 3 points

Illustrative timing trials are 0.20, 0.25, and 0.30 seconds for one defined task. A draft labels the mean a complete measure of the person’s intelligence. Calculate mean and range, describe the measured pathway in general, and correct the claim.

Question 17 · 3 points

Illustrative artificial-system record: a quantity rises from 20 to 24 units; a detector activates an output that lowers it to 21. The stated working range is 19–22 units. Explain the direction of feedback, the final relation to the range, and why these are not human clinical values.

Question 18 · 3 points

Illustrative model: a response recognizes Symbol A; Symbol B differs; after repeated A exposure the model response begins faster. No clinical records are represented. Explain specific recognition and memory, distinguish the observation from a universal protection claim, and state a model limit.

Question 19 · 3 points

Illustrative organisms: A produces new individuals from parent tissue without gamete fusion; B begins with fusion of two gametes. A later develops one new mutation. Classify the mechanisms, explain how A can vary, and distinguish offspring production from successful reproduction over a life cycle.

Question 20 · 3 points

Illustrative seven-day data: Treatment A has 18 germinated seeds of 20; B has 12 of 20. Species and other conditions are stated matched; the treatment is water amount. Calculate both percentages, describe the measured difference, and qualify the claim about lifelong plant success.

Question 21 · 3 points

Illustrative draft places a chromosome inside one gene and says every body cell with the same DNA performs the same task. Repair the nested relationship and explain cell specialization without inventing separate inherited genomes for every cell type.

Question 22 · 3 points

Illustrative cell starts with six chromosomes. DNA is copied, corresponding copies separate normally, and the cell forms two daughters. State each daughter’s chromosome count and distinguish DNA copying from permanent doubling of the chromosome set.

Question 23 · 3 points

Illustrative species has eight chromosomes in a diploid body cell, arranged in four pairs. Normal gametes form and two fuse. Find gamete and zygote counts and explain how different gametes can carry different combinations.

Question 24 · 3 points

Illustrative cross: Aa×aa; A is completely dominant and gametes have equal modeled probabilities. List possible genotypes, calculate recessive phenotype probability, and explain why four offspring need not split exactly two and two.

Question 25 · 3 points

Illustrative identical-genotype seedlings: one group receives adequate light and averages 8 cm; another receives low light and averages 5 cm. No sequence change is recorded. Explain the supported environmental comparison and correct a claim that every shorter plant must have acquired a heritable mutation.

Question 26 · 3 points

Illustrative web: grass feeds insects and rabbits; insects and seeds feed mice; mice and rabbits feed foxes. An insect decline is recorded, but other resource counts are missing. Trace one affected pathway and explain why the exact mouse or fox change cannot be determined.

Question 27 · 3 points

Illustrative energy model: producers provide 2,000 units; first consumers receive 300; second consumers receive 60 during the same interval. Calculate both transfer percentages and explain why the ten-percent shortcut and an energy-destruction claim are wrong.

Question 28 · 3 points

Illustrative pond interval: rain adds 40 L; runoff adds 20 L; evaporation removes 25 L; outflow removes 15 L. Other pathways are excluded. Calculate storage change, label inputs and outputs, and explain the conservation distinction.

Question 29 · 3 points

Illustrative dry-material study over the same interval: matched samples each start at 20 g; A ends at 14 g and B at 18 g. Moisture treatment differs; other conditions are stated matched. Calculate mass losses and explain the supported pattern with a boundary limitation.

Question 30 · 3 points

Illustrative interval: population begins at 50; births add 12; immigration adds 5; deaths remove 8; emigration removes 4. No other pathways are stipulated. Calculate ending count and explain why a before-after count alone cannot identify all pathways.

Question 31 · 3 points

Illustrative records show plant cover falling from 80% to 50% while herbivore count rises from 10 to 20; drought also occurs. Describe the changes, explain two plausible contributions, and propose evidence that separates them.

Question 32 · 3 points

Illustrative equal-effort samples: A has species counts 8,1,1; B has 4,3,3. Both samples include ten individuals and three detected species. Compare richness, total abundance, and distribution without claiming one number proves universal stability.

Question 33 · 3 points

Illustrative matched-rain model: Area A sends 18 L to surface runoff and Area B 10 L after a vegetation treatment. Starting conditions are stated comparable, but only one trial is supplied. Calculate the difference, explain a plausible pathway, and qualify a universal water-quality claim.

Question 34 · 3 points

Illustrative four 1 m² plots contain 2, 4, 3, and 3 plants of one species. A habitat area is 20 m². Find sample density, calculate an extrapolated count, and state the assumptions that prevent calling it a complete census.

Question 35 · 3 points

Illustrative plans within a 100-token budget: A costs 80 and reduces runoff from 20 to 8 L; B costs 60 and reduces it from 20 to 10 L. Both satisfy the same stated space requirement; later maintenance is unknown. Calculate reductions, compare reduction per token, and recommend a feasible option under an explicit criterion with a next test.

Question 36 · 3 points

Illustrative upright undisturbed layers: bottom contains Species A; middle A and B; top B. No numerical ages or complete regional survey are supplied. State relative order, describe detected species patterns, and qualify an extinction claim.

Question 37 · 3 points

Illustrative inherited-color model: generation one has 20 dark of 100 beetles; generation two has 50 dark of 100. Dark beetles are harder to detect on the stated ground, and greater reproductive contribution is recorded. Calculate frequencies, explain selection, and state why the evidence is stronger than a color change in one beetle.

Question 38 · 3 points

Illustrative tree: A splits from a lineage before B and C split from each other. No times, branch-length scale, or actual species identities are supplied. Identify the closest pair in the model, explain why C need not descend from living B, and state what timing cannot be inferred.

Question 39 · 3 points

Illustrative plants: A averages 12 seeds in favorable soil; B averages 9 in poorer soil. A proposal says breeding only A proves an inherited yield improvement. Explain the confound, propose a stronger comparison, and identify a diversity tradeoff.

Question 40 · 3 points

Illustrative inherited-seed model: generation one has 30 of 100 plants with Variant A; generation two has 45 of 100. A contributes more surviving offspring under the stated conditions, but movement and other populations were not measured. Calculate the change, explain a selection mechanism, identify an alternative or limit, and propose a next observation.

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