Cell Structure Basics

Overview

In this third lesson of “Exploring Organism Diversity”, students build on the idea that living things are made of cells by identifying the main visible cell parts and explaining what each one does. They will practise using labelled diagrams to communicate their understanding.

Learning intentions

WALT (We Are Learning To…)

• identify key organelles visible in plant and animal cells
• describe what the cell membrane and nucleus do
• explain that organelles have specialised functions
• communicate cell structure using a labelled diagram or digital image

Success criteria

I can…

• name the cell wall (plant cells), cell membrane, cytoplasm, nucleus, vacuoles, and chloroplasts (plant cells)
• explain that the cell membrane controls what enters and leaves the cell
• explain that the nucleus contains DNA and provides instructions for how a cell works
• draw/label a diagram and use correct scientific terms

Curriculum links

• Biological Science / Cells and organisation: Cells are fundamental units of living organisms and contain parts called organelles.
• Biological Science / Cells and organisation: Organelles are structures inside cells with specialised functions (cell membrane and nucleus focus).
• Biological Science / Cells and organisation: Plant cells have a cell wall, chloroplasts, and a large vacuole.
• Science practices: investigating, recording, and communicating findings using labelled diagrams or digital images.

Lesson structure (45 minutes)

1. 0–5 min · Starter check-in. Teacher shows two quick images (plant cell and animal cell) and asks, “What might be inside these ‘building blocks’ of life?” Students turn and talk, then share one idea; teacher records common terms on the board.

2. 5–12 min · Mini lesson: Cells and organelles. Teacher introduces the core idea: cells are the basic units of living things; organelles are structures inside cells with specialised functions. Students copy a short two-sentence summary and underline the words “cell”, “organelle”, and “specialised function”.

3. 12–22 min · Direct teach: Function cards. Teacher focuses on two functions that students often mix up:

• cell membrane: thin layer around the cell that controls what enters and leaves
• nucleus: contains genetic material (DNA) with instructions for how the cell works Students complete a quick “match and explain” task: each statement must be matched to the correct organelle and followed by a one-sentence explanation.

4. 22–34 min · Model-making: Labelled diagram. Teacher demonstrates how to label carefully: add labels to the correct parts, then add a short function phrase (e.g., “membrane controls what enters/leaves”). Students work in pairs with a blank plant-or-animal cell diagram template (teacher assigns each pair a cell type). They add labels and function notes for the organelles listed in the learning intentions.

5. 34–40 min · Gallery walk: Evidence and feedback. Teacher sets up a classroom gallery (paper corners or digital sharing screen). Students use “glow and grow” feedback: one thing done well (correct label/clear function) and one improvement suggestion (spelling, placement, or function accuracy).

6. 40–45 min · Exit ticket: One function, one term. Teacher distributes an exit ticket with two prompts:

• “The nucleus contains ____ and provides instructions for ____.”
• “The cell membrane controls what ____ and ____.” Students answer independently; teacher collects to gauge understanding for Lesson 4.

Resources

• Printed plant cell and animal cell diagram templates (teacher-prepared)
• Organelles function cards (cell membrane, nucleus, plus label list prompts for cytoplasm, vacuoles, chloroplasts, cell wall)
• Student science notebooks or worksheets
• Coloured pencils or fine-tip markers for clear labelling
• Sticky notes for “glow and grow” feedback
• Timer for structured steps
• Digital option: slides or shared document for quick cell diagram labelling (if available)

Assessment

• Formative checking during Step 3: teacher circulates and listens for correct matching of organelle to function.
• Observation during Step 4: teacher checks correct placement of labels and clarity of function statements.
• Exit ticket in Step 6: confirms understanding of nucleus (DNA/instructions) and cell membrane (controls entry/exit).

Differentiation

• Support: Provide a word bank (cell membrane, nucleus, cytoplasm, vacuole, chloroplast, cell wall, DNA, controls, instructions) and sentence starters for the exit ticket.
• Support: For students needing extra structure, offer a partially labelled diagram where only function phrases must be written.
• Extension: Challenge students to add one additional comparison statement in their diagram notes: “Plant cells have…, Animal cells do not …” (chloroplasts and cell wall as the focus).
• EAL/SEN: Use clear visuals on function cards and allow “oral to written” support—students first explain their function sentence to a partner, then write it.