Digestion Reactions

Overview

In this lesson, students connect digestion in the human body to the ideas of chemical reactions and macromolecules. They will interpret scientific language, translate information between words and visuals, and summarize a process using evidence from a short technical text.

Learning intentions

Students will be able to:

• Determine meanings of domain-specific terms (e.g., macromolecule, enzyme, hydrolysis) in a digestion context.
• Trace the explanation of digestion as a complex process and produce an accurate summary.
• Translate quantitative/technical information from text into a simple visual representation (table or flow).
• Follow a multistep procedure for analyzing a digestion scenario and recording results precisely.

Success criteria

Students can:

• Define key digestion terms accurately using context clues from the text.
• Create a clear process map of digestion (what changes, where, and by what mechanism).
• Summarize digestion using the text’s main ideas without adding unsupported claims.
• Convert one text description into a visual (table/flow) with correct relationships.

Curriculum links

• Reading: Science and Technical Subjects — Determine the meaning of symbols, key terms, and other domain-specific words and phrases in context.
• Reading: Science and Technical Subjects — Determine the central ideas/conclusions and accurately summarize a text’s depiction of a complex process.
• Reading: Science and Technical Subjects — Translate technical information expressed in words into visual form.
• Reading: Science and Technical Subjects — Follow precisely a complex multistep procedure when carrying out tasks and recording measurements/outputs.
• Reading: Science and Technical Subjects — Analyze the structure of relationships among concepts in a text, including relationships among key terms.

Lesson structure (45 minutes)

1. 0–5 min · Hook (scenario + quick think). Teacher displays a short prompt: “Why does bread turn into smaller molecules after it’s eaten?” Students think individually, then write one sentence that includes at least one digestion term (enzyme/macromolecule/reaction).

2. 5–12 min · Direct teach (terms in context). Teacher models how to use context clues by reading 2–3 sentences from a digestion technical excerpt and underlining key words (macromolecule, enzyme, hydrolysis/reaction). Students annotate in pairs: circle an unfamiliar term and write a context-based meaning.

3. 12–22 min · Guided reading (process understanding). Teacher assigns a short, teacher-provided digestion text segment (about protein/starch/lipids and where digestion happens). Students complete a “process evidence” chart: in three boxes (stomach/small intestine/cell use), they record what the text says changes and which terms connect those changes.

4. 22–30 min · Translate to visual (words → chart). Teacher demonstrates converting one paragraph into a simple visual by drawing a 3-step flow (macromolecule → breakdown → smaller molecules). Students create their own visual: a flowchart or table with columns for “Input,” “Process,” and “Output,” using at least 4 technical terms from the text.

5. 30–38 min · Multistep analysis procedure (accurate recording). Teacher explains the analysis procedure for a “reaction mapping” task: Step 1 identify the macromolecule described, Step 2 name the enzyme/process term, Step 3 state the change (breakdown/cleavage), Step 4 write one cause-effect sentence using the relationships between terms. Students follow the steps precisely on their worksheet and double-check that each statement matches a sentence from the text.

6. 38–43 min · Share + revise (structure of relationships). Teacher selects two student visuals to compare: one that correctly connects terms and one with a common error (missing location or unclear cause-effect). Students use a checklist to give one “strength” and one “question” to improve accuracy.

7. 43–45 min · Exit ticket (summary). Students write a 3–4 sentence summary: main idea of digestion, one key process location, and one relationship between key terms (e.g., enzyme enables hydrolysis of macromolecules).

Resources

• Short digestion technical text handout (teacher-created or district-approved)
• Student annotation worksheet: “Term in Context” and “Process Evidence”
• Visual translation template: flowchart/table with labeled rows
• Reaction mapping task sheet with the 4-step directions
• Highlighters/colored pencils
• Projector/board for modeling
• Exit ticket slips or a digital form

Assessment

• Formative check: teacher circulates during annotation to verify term meanings are context-based, not guessed.
• Formative check: review process evidence charts for correct relationships (term-to-process-to-location).
• Exit ticket: 3–4 sentence summary scored with a quick rubric (key terms used correctly, process accurately described, relationships stated clearly).

Differentiation

• Support: provide a word bank with student-friendly definitions starters (e.g., “An enzyme is…,” “Hydrolysis is…”) and sentence starters for the cause-effect line.
• Support: allow students to highlight text evidence using a consistent color code (term = one color, process = second, location = third).
• Extension: students who finish early add a second visual for a different macromolecule mentioned in the text and compare how reactions differ by location.
• EAL/SEN: offer brief oral read-aloud of the text segment and provide a reduced “term list” (fewer target words) with the same required output structures.