Biology · 40 minutes

Suggested grades 9–10 · Unit 2: Matter and Energy in Organisms · Lesson 2 of 2

Food, Oxygen and Energy Transfer

Explain cellular respiration without describing energy as an atom or saying bond breaking alone releases it.

Mr. S Teaches · Original starter lesson · HS-BIO-04 · Grade range is planning guidance.

Watch, notice, discuss

Video choices for this lesson

2 choices

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OPTION 1 · YOUTUBE

Cellular Respiration (UPDATED)

By Amoeba Sisters

Compare the respiration inputs and outputs with the lesson’s matter and energy account.

Open on YouTube: Cellular Respiration (UPDATED) (opens a new tab) ↗

OPTION 2 · YOUTUBE

Cellular Respiration: Do Cells Breathe?: Crash Course Biology #27

By CrashCourse

Use the ATP and energy-transfer explanation to distinguish usable energy from matter; detailed pathways are background.

Open on YouTube: Cellular Respiration: Do Cells Breathe?: Crash Course Biology #27 (opens a new tab) ↗

After watching

What idea from the video helps you use a net model to distinguish matter rearrangement, usable energy transfer and thermal transfer? Identify one useful example and one limit of the video's model or explanation.

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Learning objective

Use a net model to distinguish matter rearrangement, usable energy transfer and thermal transfer.

Before you begin

Recognize photosynthesis inputs and outputs.

Gather your materials

Paper or notebook
Pencil; calculator optional for numerical work; all task data supplied below

Language to know

cellular respiration: Processes transferring energy through reactions involving food molecules.
aerobic: Involving oxygen in the represented process.
energy transfer: Energy moving between parts of a system or its surroundings.

Understand the concept

Technical text: A simplified aerobic-respiration equation is C6H12O6 + 6O2 → 6CO2 + 6H2O, with a net transfer of energy to cellular processes and surroundings. Breaking bonds requires energy; forming new bonds releases energy. The overall reaction can release usable energy because of the combined changes, not because every broken bond releases it. Plants as well as animals carry out cellular respiration. The net equation omits intermediate steps and does not specify how much energy is captured by a particular cell.

Teach it step by step

Translate the equation into a matter-input/output diagram.
Count each element and identify where food carbon appears among the outputs.
Draw separate arrows for energy transferred to cellular work and thermal energy transferred to surroundings.
Use two precise details from the text to correct an inaccurate explanation about plants or bond energy.

Make the thinking visible

Worked example or model response

Six glucose carbon atoms appear in six CO2 molecules. An energy arrow is not a new substance on the output side. “Respiration destroys food matter to create energy” is misleading: atoms rearrange and energy is transferred through the reaction system.

Guided practice

Together correct “Plants photosynthesize, so they never respire.” Refer to the text and distinguish the two processes.

Independent practice

Write a model explanation with an atom count and two energy arrows. Explain why measuring CO2 in a real setup would need controls for other carbon sources.

Quick assessment

Does a balanced equation imply that all reaction energy becomes useful cellular work?

Answer key & assessment criteria

Answers and teaching guidance

Guided: Plants also respire; photosynthesis stores energy in produced molecules, while respiration transfers energy from chemical changes to cellular processes and surroundings.
Independent: Criteria include conserved atoms, food-carbon→CO2, distinct energy transfers and a control for another possible CO2 source.
Quick check: No. Some energy is dispersed thermally; the net equation alone does not state the efficiency of cellular capture.

Look for: Assess the stated objective using the concrete criteria and explanations in the answer key. Invite an alternative supported solution; distinguish a model’s prediction from an established observation.

Make it work for your learner

More support

Place the photosynthesis and respiration summaries side by side and label matter and energy separately.

Extension challenge

Explain why treating the two net equations as simple opposite switches misses the fact that both processes involve complex pathways.

Verified references · Selected contributions

Standards connections

Selected NGSS high school-band contribution; full performance requires additional evidence and instruction.

Subject-content standards

These records identify the part of a subject standard practiced here. Course placement is instructional guidance; the source’s category or band remains authoritative.

Contributes to NGSS performance expectation

HS-LS1-7

NGSS · High school band

Model matter rearrangement and energy transfer during cellular respiration.

Read the official performance expectation ↗

This conceptual net model addresses matter rearrangement and energy transfer. It omits cellular stages, capture efficiency and empirical measurements required for a fuller explanatory model.

Verified 2026-11-04. Selected contribution, not full attainment.

Supporting literacy connections

These records apply to the specified reading, writing or communication task. They do not establish subject-content alignment.

Supporting Common Core literacy connection

RST.9-10.1

Common Core · Grades 9–10

Use precise textual details in scientific analysis.

Read the official standard ↗

The activity explicitly analyzes the provided technical text, table or model. It contributes selected literacy practice rather than complete grade-band reading coverage or independent subject-content alignment.

Verified 2026-11-04. Selected contribution, not full attainment.

A course map. A practical starting point.

These 138 original mini-lessons sample 23 courses for grades 9–12. They do not provide a full year of daily lessons, complete standards coverage, accredited courses or graduation credit. Suggested grade ranges, prerequisites and unit order are planning guidance; school pathways and elective availability vary. Calculus is excluded.

Subject-content contribution identifies a selected math, English, science or world-language skill. Common Core high school math uses conceptual categories, not universally assigned courses or grades. Mapping a skill to a course is an instructional choice. (+) Additional preparation identifies standards the official source marks for advanced study.

English uses the 9–10 and 11–12 bands; there are no separate Common Core English 9, 10, 11 or 12 codes. NGSS references identify the high school band and partial performance-expectation contributions.

Supporting Common Core literacy connection applies only to an actual reading, writing or communication activity. It does not establish science, social studies or elective subject-content alignment. Unverified subject-content mappings are labeled explicitly.

Spanish uses World-Readiness language standards, identified by their official names in the current summary. Common Core does not measure Spanish proficiency. Supported lesson practice is distinct from an independently assessed proficiency rating and from the course title.

Use North Carolina’s Standard Course of Study ↗ for local planning. No NC alignment is claimed without a verified crosswalk. Each mapping links to official wording, records its verification date and explains the part practiced.