What Is an Organism?

Overview

This first lesson in the six-part unit “One Cell, Many Cells” introduces organisms as living things. Students observe familiar examples, identify shared characteristics of life, discuss their thinking with a partner, and record questions that will guide later investigations of cells and multicellular organisms.

Learning intentions

Students will be able to:

• Define an organism in age-appropriate scientific language.
• Identify characteristics shared by living things.
• Use observations and prior knowledge to classify examples as living or nonliving.
• Record relevant questions for future investigation.

Success criteria

• I can explain what an organism is.
• I can describe at least three characteristics of living things.
• I can support a living or nonliving classification with an observation.
• I can write a question I want to investigate about organisms or cells.

Curriculum links

• North Carolina Grade 5 Science: Living organisms have structures and functions that support survival, growth, development, and reproduction.
• Speaking and Listening: Participate in collaborative discussions, build on others’ ideas, and summarize information presented orally or visually.
• Writing: Gather relevant information, paraphrase ideas in notes, and record questions for investigation.
• Informative writing: Introduce a topic clearly and group related information logically.

Lesson structure (30 minutes)

1. 0–4 min · Hook and notice. Display the opening organism images showing a child, a tree, a dog, a mushroom, a rock, and a toy robot. Ask, “Which of these could be an organism, and what makes you think so?” Students silently choose two examples and share an initial reason with a partner.

2. 4–9 min · Build the definition. Use the definition and characteristics slides to introduce: an organism is an individual living thing. Guide students to identify common characteristics, including obtaining and using energy, growing and changing, responding to surroundings, reproducing, and carrying out life processes. Students paraphrase the definition in their own words and add one characteristic to their science notebook.

3. 9–16 min · Observation activity. Provide each pair with the organism observation and classification sheet and a classroom object or image set such as a plant, seed, insect photograph, shell, rock, and toy. Students observe two examples, record what they notice, classify each as living, once living, or never living, and cite an observation as evidence. Remind students that “once living” objects came from organisms but are not currently alive.

4. 16–21 min · Partner discussion. Display the partner discussion prompts. Students compare classifications using the frame, “I classified ___ as ___ because I observed ___.” Partners respectfully challenge or revise one idea and explain their reasoning. Invite two or three pairs to share an example that was difficult to classify.

5. 21–27 min · Questions for investigation. Use the question-building and unit roadmap slides to connect today’s thinking to the unit. Model turning “Are organisms made of cells?” into a focused question such as “Do all organisms have cells?” Students write two questions on the worksheet, then star the question they most want to investigate. Partners read their starred questions aloud and summarize one another’s ideas.

6. 27–30 min · Plenary and check. Return to the opening images with the closing review slide. Students complete the worksheet exit response: “An organism is ___; one characteristic of living things is ___; one question I have is ___.” Collect responses as students leave.

Resources

• the organism introduction, observation directions, discussion prompts, and review deck
• the organism observation and classification sheet
• Science notebooks or lined paper
• Pencils
• Familiar classroom objects or printed image examples
• Projector or interactive display
• Optional hand lenses
• Board space for recording student ideas

Assessment

• During the hook and partner discussion, listen for students using observations rather than guesses to justify classifications.
• Review the observation sheet for an accurate definition, at least three characteristics of life, and evidence-based classifications.
• Use the exit response to identify students who confuse “once living” with “currently living” or who need support distinguishing an organism from an object.

Differentiation

• Provide a word bank with organism, living, nonliving, grow, respond, energy, reproduce, and evidence. Offer sentence frames such as “I know ___ is living because ___.”
• For students needing additional support, use fewer examples, pair them strategically, read directions aloud, and allow oral responses recorded by a partner or teacher.
• Support English learners with labeled pictures, gestures for key characteristics, partner rehearsal, and permission to sketch before writing.
• Extend students by asking them to explain why a seed, virus, or fire might be difficult to classify and what evidence scientists would need.