Living Clue Investigators

Overview

Students investigate what makes something living rather than simply sorting objects by appearance. Working as a team of four, they brainstorm clues, test examples and use evidence to classify organisms and non-living things. The lesson develops scientific discussion, observation and reasoning, building towards the idea that all living things are organisms and that organisms may be single-celled or multicellular.

Learning intentions

• WALT identify clues that help us decide whether something is living.
• WALT distinguish between living, non-living and once-living things.
• WALT use observations and evidence to justify a scientific claim.
• WALT communicate and reflect on our thinking as scientists.

Success criteria

• I can describe several characteristics of living things.
• I can classify examples and explain my reasoning.
• I can recognise that an organism may be made of one cell or many cells.
• I can listen to others, contribute an idea and revise my thinking when evidence changes.

Curriculum links

• Biological Science — Organism Diversity: all living things are organisms.
• Biological Science — Organism Diversity: organisms can be single-celled or multicellular.
• Biological Science — Cells and organisation: cells are the fundamental unit of living organisms and contain structures called organelles.
• Biological Science — Ecosystem interactions: biotic factors include living or once-living organisms.

Lesson structure (60 minutes)

1. 0–7 min · Mystery hook. Display a photograph or object sequence using the mystery hook slides: a seed, a flame, a robot, a dead leaf, a mushroom and a virus image. Ask, “Which of these could be alive, once alive or never alive? What clues would convince you?” Students silently choose one, then share a reason with the group. Record ideas without confirming answers.

2. 7–17 min · Build the clues. Use the living-things teaching slides to introduce common characteristics: made of cells, using energy, exchanging materials, growing or changing, responding to surroundings, reproducing and removing waste. Explain that no single clue is always enough; scientists use a collection of evidence. Students help create a class “clue bank”, separating observations from assumptions. Clarify that a dead leaf is once-living, while a rock is non-living.

3. 17–22 min · Team investigation briefing. Distribute the living and non-living clues worksheet. Assign four rotating roles: facilitator, evidence recorder, questioner and reporter. Model one example, such as a bicycle, using the sentence frame: “We classify ___ as ___ because we observe ___.” Students predict which examples may be difficult and write one investigation question.

4. 22–40 min · Clue detectives. Students complete the worksheet in pairs, then compare decisions as a group of four. They classify examples such as a dog, tree, bacterium, mushroom, cloud, fire, seed, shell, robot and dead leaf as living, non-living or once-living. For each difficult example, they record at least two clues and one uncertainty. Move between students, asking, “What evidence supports that?”, “Could this have been alive before?” and “Would it be an organism?” Use the investigation instruction slides to keep the process visible.

5. 40–50 min · Defend and challenge. Each student selects one debatable example from the worksheet and gives a 30-second claim-evidence explanation. The other students may ask one respectful challenge question, such as “Does it carry out all the processes by itself?” or “Is it made of cells?” Students may change their classification, but must record what evidence caused the change. Emphasise that changing an idea in response to evidence is good scientific practice.

6. 50–56 min · Connect to cells and ecosystems. Return to the cells and ecosystem connection slides. Students discuss why a bacterium can be an organism even though it is single-celled, and why a dead leaf can be a biotic factor because it was once living. Students add a short explanation to the final worksheet question: “How do cells help us decide whether something is an organism?”

7. 56–60 min · Reflection and exit check. Students complete the reflection box on the living and non-living clues worksheet and share one changed or strengthened idea. Finish with the reflection and exit slides showing: “Classify a seed, a flame and a bacterium. Give one piece of evidence for each.” Collect worksheets or hear responses individually.

Resources

• the living and non-living investigation deck
• the living and non-living clues worksheet
• Six to ten photographs or classroom objects: seed, rock, dead leaf, toy robot, shell, fire image and mushroom image
• Whiteboard and markers
• Pencils and coloured pencils
• Timer
• Four role cards or role names written on the board

Assessment

• Listen for students using evidence rather than appearance alone during classification and group discussion.
• Check worksheets for accurate use of living, non-living and once-living categories, with reasons linked to characteristics of life.
• Use the final response to assess whether students understand that organisms are made of cells, including single-celled organisms. Note any confusion about fire, viruses or dead organisms for the next lesson.

Differentiation

• Provide the sentence frames “I classify ___ as ___ because ___” and “My evidence is ___” for students who need language support.
• Use picture labels and read worksheet instructions aloud; allow students to explain reasoning orally or through labelled drawings.
• Give each student a defined role and use turn-taking so all four students contribute.
• Extend confident students by asking them to rank their clues from strongest to weakest, explain why viruses or fire are challenging examples, or design a new mystery example for another group to classify.
• For EAL learners, pre-teach living, non-living, once-living, organism, cell, evidence and classify with simple visuals and gestures.