Life Science & Scientific Inquiry — Sample exam worked answers
Student exam paperCourse-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.
8 questions · 24 points · suggested 45 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 | 3 |
| Cells, Transport & Cellular Energy | 2 | 3 |
| Body Organization, Transport & Movement | 3 | 3 |
| Coordination, Defense & Reproduction | 4 | 3 |
| Genes, Cell Division & Heredity | 5 | 3 |
| Ecosystems, Matter & Energy | 6 | 3 |
| Ecological Evidence & Environmental Design | 7 | 3 |
| Evolution, Evidence & Life History | 8 | 3 |
Parent / teacher marking guide
- A person awards each of the three criteria separately; written responses are not automatically graded.
- Accept scientifically accurate alternatives and accessible response forms.
- Discuss errors and revise a response. A score does not certify district mastery or homeschool credit.
Question 1 · 3 points
A fungus has walls but no chloroplasts. Must it be an animal or a plant?
Worked answer
No. Those two categories do not exhaust biological diversity. Fungi have their own characteristics; combine cell features, nutrition, and relationship evidence rather than forcing a two-category choice.
Identify the relevant organism, process, or model.
Connect supplied evidence with the explanation, using calculation steps and units where needed.
State a correct assumption, distinction, or evidence limitation.
Marking criteria
- Accurate biological concept or distinction.
- Evidence, calculation, or model connected with an explained claim.
- A correct limitation, assumption, or needed additional observation.
Question 2 · 3 points
A student says plants use respiration only at night. Correct the claim.
Worked answer
Plants respire in light and darkness. Photosynthesis can occur in suitable light at the same time, so a net gas change must account for both processes.
Identify the relevant organism, process, or model.
Connect supplied evidence with the explanation, using calculation steps and units where needed.
State a correct assumption, distinction, or evidence limitation.
Marking criteria
- Accurate biological concept or distinction.
- Evidence, calculation, or model connected with an explained claim.
- A correct limitation, assumption, or needed additional observation.
Question 3 · 3 points
A draft calls kidney processing a digestive absorption step. Correct the system relationship.
Worked answer
Kidneys process materials from blood and regulate excretion and balance. Digestive absorption moves food-related materials across the intestinal lining; circulation connects the systems but the steps differ.
Identify the relevant organism, process, or model.
Connect supplied evidence with the explanation, using calculation steps and units where needed.
State a correct assumption, distinction, or evidence limitation.
Marking criteria
- Accurate biological concept or distinction.
- Evidence, calculation, or model connected with an explained claim.
- A correct limitation, assumption, or needed additional observation.
Question 4 · 3 points
Why is the same germination treatment not automatically best for every plant species?
Worked answer
Species can have different requirements and tolerances. Evidence from one species and interval needs qualification before generalizing.
Identify the relevant organism, process, or model.
Connect supplied evidence with the explanation, using calculation steps and units where needed.
State a correct assumption, distinction, or evidence limitation.
Marking criteria
- Accurate biological concept or distinction.
- Evidence, calculation, or model connected with an explained claim.
- A correct limitation, assumption, or needed additional observation.
Question 5 · 3 points
A mutation has no visible effect in one setting. Must it be impossible or meaningless?
Worked answer
No. Its effect may be small, depend on conditions, or not change the measured trait. A genetic change and a visible phenotype are different observations.
Identify the relevant organism, process, or model.
Connect supplied evidence with the explanation, using calculation steps and units where needed.
State a correct assumption, distinction, or evidence limitation.
Marking criteria
- Accurate biological concept or distinction.
- Evidence, calculation, or model connected with an explained claim.
- A correct limitation, assumption, or needed additional observation.
Question 6 · 3 points
A field count rises after a survey team doubles its observation time. Can the increase be assigned directly to population growth?
Worked answer
No. More effort can detect more individuals. Use comparable survey effort and methods before interpreting the difference as true growth.
Identify the relevant organism, process, or model.
Connect supplied evidence with the explanation, using calculation steps and units where needed.
State a correct assumption, distinction, or evidence limitation.
Marking criteria
- Accurate biological concept or distinction.
- Evidence, calculation, or model connected with an explained claim.
- A correct limitation, assumption, or needed additional observation.
Question 7 · 3 points
Plan C achieves the largest reduction but costs 130 tokens under the same 100-token limit. Is it currently feasible?
Worked answer
No. It exceeds the stated constraint unless the budget or plan changes. A desirable result does not remove a feasibility limit.
Identify the relevant organism, process, or model.
Connect supplied evidence with the explanation, using calculation steps and units where needed.
State a correct assumption, distinction, or evidence limitation.
Marking criteria
- Accurate biological concept or distinction.
- Evidence, calculation, or model connected with an explained claim.
- A correct limitation, assumption, or needed additional observation.
Question 8 · 3 points
A project uses only a graph of frequencies and claims a specific new mutation caused the change. What evidence is missing?
Worked answer
The graph does not identify a new sequence change or its transmission. Genetic and reproductive evidence, with alternatives such as movement and sampling considered, would be needed.
Identify the relevant organism, process, or model.
Connect supplied evidence with the explanation, using calculation steps and units where needed.
State a correct assumption, distinction, or evidence limitation.
Marking criteria
- Accurate biological concept or distinction.
- Evidence, calculation, or model connected with an explained claim.
- A correct limitation, assumption, or needed additional observation.