Parent plan · Week 16 · Matter & Energy in Living Systems — connect, practice and revise — Life Science: Biology
Parent teaching plan · 36 weeksUnits to teach or revisit
Chapter 4 · Matter & Energy in Living Systems
Assigned readings
Follow the chapter question: How does sunlight support living systems without creating new matter?
This week’s goals
- Explain the figures, mechanisms and quantities before calculation.
- Distinguish source observations, illustrative records and hypotheses.
- Apply independently and revise from evidence.
Read A plant’s oxygen record is not the whole energy story at this chapter’s launch, then use its linked unit explanations and source records in the assigned sessions.
Five flexible sessions, normally about 50–60 minutes. Unit study uses three sessions. The sample keeps a complete 90-minute extended sitting paired with about 30 minutes of correction; extend teaching when needed.
Session 1 · Comparing Photosynthesis & Respiration — connect and apply
Gross production refers to production before a specified subtraction; net exchange is the signed balance of inflows/outflows or production/consumption at the stated boundary. In this oxygen model, production is 12 units/h and consumption four, so net release is eight. A zero net rate can therefore coexist with active production and consumption. Definitions must identify the variable: ecosystem net carbon production, leaf oxygen exchange and biomass growth are related but different accounts. Changing a light level may alter more than one process.
Your task
Study Parts 3–4 and any named source records. Attempt the whole-unit application with labeled mechanisms, correct quantities and a limitation.
- Prepare the assigned reading and identify the question.
- Trace the figures and retain a labeled first model or prior attempt.
- Complete the stated task before opening guidance.
- Compare reasoning with criteria, explain a correction and retain the revised evidence.
Hint and response guidance
Name the structures, quantities, system boundary and assumptions before selecting a mechanism.
No. Equal production and consumption can balance to zero while both continue. Rates change over time, so use the complete interval and system boundary rather than extrapolating one moment.
- Use the stated evidence and correct units.
- Explain a biological mechanism or relationship.
- Show intermediate reasoning with a labeled figure or calculation.
- State a limitation and a useful revision/test.
Session 2 · Comparing Photosynthesis & Respiration — explain and transfer
Use the worked case and a changed condition to test independent understanding.
Your task
Study the illustrated worked case, attempt varied practice and the changed independent case, then revise the opening model and complete the exit check.
- Prepare the assigned reading and identify the question.
- Trace the figures and retain a labeled first model or prior attempt.
- Complete the stated task before opening guidance.
- Compare reasoning with criteria, explain a correction and retain the revised evidence.
Hint and response guidance
Name the structures, quantities, system boundary and assumptions before selecting a mechanism.
Net daytime gain is 6×(10−3)=42 units; later loss is 18×3=54. The day’s net change is −12 units despite positive daytime release under the stated simplified conditions.
- Use the stated evidence and correct units.
- Explain a biological mechanism or relationship.
- Show intermediate reasoning with a labeled figure or calculation.
- State a limitation and a useful revision/test.
Session 3 · Account for Carbon and Gas Exchange — plan and model
What does a change in oxygen reveal about photosynthesis and respiration?
Your task
Choose the stated safe material or supplied-record route, define variables/controls and draw a prediction.
- Prepare the assigned reading and identify the question.
- Trace the figures and retain a labeled first model or prior attempt.
- Complete the stated task before opening guidance.
- Compare reasoning with criteria, explain a correction and retain the revised evidence.
Hint and response guidance
Name the structures, quantities, system boundary and assumptions before selecting a mechanism.
The high-light net change is +5 units/hour. If respiration consumes 3 units/hour as in darkness, estimated gross production is 8 units/hour. Net zero could mean equal production and consumption. Photosynthesis transfers light energy into chemical processes; respiration transfers chemical energy into ATP and heat. If respiration changes in light, the gross estimate must be revised. A complete response also states the system boundary, units, matched conditions and limitations. Distinguish supplied illustrative outcomes from collected measurements, and explain why your revised mechanism fits the relevant evidence. Different observations should be interpreted rather than replaced to match the example.
- Use the stated evidence and correct units.
- Explain a biological mechanism or relationship.
- Show intermediate reasoning with a labeled figure or calculation.
- State a limitation and a useful revision/test.
Session 4 · Account for Carbon and Gas Exchange — records and comparison
What does a change in oxygen reveal about photosynthesis and respiration?
Your task
Use the given method and safety notes; collect or analyze records with units, repeats and honest variation.
- Prepare the assigned reading and identify the question.
- Trace the figures and retain a labeled first model or prior attempt.
- Complete the stated task before opening guidance.
- Compare reasoning with criteria, explain a correction and retain the revised evidence.
Hint and response guidance
Name the structures, quantities, system boundary and assumptions before selecting a mechanism.
The high-light net change is +5 units/hour. If respiration consumes 3 units/hour as in darkness, estimated gross production is 8 units/hour. Net zero could mean equal production and consumption. Photosynthesis transfers light energy into chemical processes; respiration transfers chemical energy into ATP and heat. If respiration changes in light, the gross estimate must be revised. A complete response also states the system boundary, units, matched conditions and limitations. Distinguish supplied illustrative outcomes from collected measurements, and explain why your revised mechanism fits the relevant evidence. Different observations should be interpreted rather than replaced to match the example.
- Use the stated evidence and correct units.
- Explain a biological mechanism or relationship.
- Show intermediate reasoning with a labeled figure or calculation.
- State a limitation and a useful revision/test.
Session 5 · Account for Carbon and Gas Exchange — explain and revise
What does a change in oxygen reveal about photosynthesis and respiration?
Your task
Graph, explain the mechanism, assess a limitation and revise the first model; submit a complete notebook.
- Prepare the assigned reading and identify the question.
- Trace the figures and retain a labeled first model or prior attempt.
- Complete the stated task before opening guidance.
- Compare reasoning with criteria, explain a correction and retain the revised evidence.
Hint and response guidance
Name the structures, quantities, system boundary and assumptions before selecting a mechanism.
The high-light net change is +5 units/hour. If respiration consumes 3 units/hour as in darkness, estimated gross production is 8 units/hour. Net zero could mean equal production and consumption. Photosynthesis transfers light energy into chemical processes; respiration transfers chemical energy into ATP and heat. If respiration changes in light, the gross estimate must be revised. A complete response also states the system boundary, units, matched conditions and limitations. Distinguish supplied illustrative outcomes from collected measurements, and explain why your revised mechanism fits the relevant evidence. Different observations should be interpreted rather than replaced to match the example.
- Use the stated evidence and correct units.
- Explain a biological mechanism or relationship.
- Show intermediate reasoning with a labeled figure or calculation.
- State a limitation and a useful revision/test.
Submit this week
- First/revised labeled models and supported explanations.
- Assigned practice, quiz/review or exam attempt and corrections.
- Investigation records with graph, units and limitations when scheduled.
Parent / teacher weekly conference
Discuss an actual attempt before opening guidance. Use written-response criteria and notebook evidence to choose support. These home-study sessions do not certify mandated investigations or school laboratory eligibility.
- Can the learner trace a figure and explain every relevant label?
- Are variables, units and stated assumptions correct?
- Can a changed case be solved without copying a worked answer?