Science · Year 4 · Living Things and Their Habitats · Autumn Term

What Makes Something Alive?

Exploring the seven life processes to differentiate living, dead, and non-living things.

• National Curriculum Attainment Targets
• KS2: Science - Living Things and Their Habitats

About This Topic

The topic 'What Makes Something Alive?' guides Year 4 students through the seven life processes, known as MRS GREN: movement, respiration, sensitivity, growth, reproduction, excretion, and nutrition. Students classify everyday objects, such as a puppy, a fallen leaf, and a stone, by determining if they currently perform these processes. A living puppy moves, respires, and grows; a dead leaf once did these but no longer can; a stone does none. Key questions prompt analysis, like comparing a rock's inert nature to a plant's nutrition uptake, and predictions about consequences if one process fails, such as halted growth leading to death.

This content fits the UK National Curriculum's KS2 Living Things and Their Habitats unit in the Autumn term. It builds classification skills, observation accuracy, and logical reasoning, essential for future biology topics like food chains or evolution. Students learn that life processes interconnect, forming a checklist for scientific identification.

Active learning excels with this topic because students handle real specimens, sort ambiguous items like viruses or robot toys, and debate classifications in pairs. These experiences turn memorisation into meaningful discernment, boosting confidence and long-term recall through tactile exploration and peer dialogue.

Key Questions

1. Differentiate between living, dead, and non-living things using specific criteria.
2. Analyze how a rock is different from a plant based on life processes.
3. Predict what would happen if a living thing could not carry out one of its life processes.

Learning Objectives

• Classify objects as living, dead, or non-living based on the seven life processes.
• Compare and contrast the characteristics of a plant and a rock using the MRS GREN acronym.
• Analyze the consequences of a living organism being unable to perform one of the seven life processes.
• Explain the function of each of the seven life processes (MRS GREN) in maintaining life.

Before You Start

Characteristics of Plants and Animals

Why: Students need a basic understanding of what plants and animals are before differentiating them based on life processes.

Properties of Materials

Why: Understanding that objects like rocks have different properties than living things is a foundation for classifying them.

Key Vocabulary

MRS GREN	A mnemonic used to remember the seven life processes: Movement, Respiration, Sensitivity, Growth, Reproduction, Excretion, and Nutrition.
Living	An organism that currently carries out all seven life processes.
Dead	An organism that was once living but can no longer perform the seven life processes.
Non-living	An object or substance that has never carried out the seven life processes.
Respiration	The process by which living things release energy from food.

Watch Out for These Misconceptions

Common Misconception

Anything that moves is alive.

What to Teach Instead

Students often classify wind-blown leaves or battery toys as living due to movement alone. Hands-on sorting with checklists reveals other processes like respiration are absent. Peer debates clarify that movement must be self-generated, building precise criteria through evidence sharing.

Common Misconception

Plants are not alive because they do not move or eat.

What to Teach Instead

Many overlook plant growth, sensitivity to light, or nutrition via roots. Observing time-lapse videos or testing tropisms in pairs corrects this. Active trials show plants perform MRS GREN subtly, fostering appreciation for diverse life forms.

Common Misconception

Dead things were never alive.

What to Teach Instead

Confusion arises with fossils or dried seeds seeming always non-living. Examining stages with real specimens in stations helps distinguish past from present processes. Group timelines reinforce that life processes cease at death, not begin anew.

Active Learning Ideas

Sorting Carousel: MRS GREN Classification

Prepare trays with 20 objects: live worms, dead insects, seeds, robots, leaves, stones. In small groups, students use MRS GREN checklists to sort into living, dead, non-living piles. Rotate trays every 10 minutes, then share and justify one tricky item as a class.

45 min·Small Groups

Observation Logs: Live vs Still

Provide magnifying glasses and charts. Pairs observe a snail, plant clipping, and plastic toy for 10 minutes, ticking off MRS GREN evidence. Compare logs in plenary, noting what proves 'alive now'. Extend by predicting changes if conditions alter.

30 min·Pairs

Prediction Chains: Process Failures

Distribute cards naming life processes. Whole class brainstorms effects of failure, like no respiration equals death. Chain predictions on a board, then test with wilted vs fresh plants. Groups illustrate one chain for display.

35 min·Whole Class

Role-Play Stations: Life Processes Demo

Set four stations for groups to act out MRS GREN: mime growth, sensitivity to light. Record videos on tablets. Regroup to watch and score accuracy against criteria, refining performances.

40 min·Small Groups

Real-World Connections

• Veterinarians use their knowledge of life processes to diagnose illnesses in animals, determining if symptoms like lack of movement or appetite indicate a serious problem.
• Botanists study plant nutrition and growth to develop better crops, understanding how plants absorb nutrients from the soil and sunlight.
• Forensic scientists examine evidence at crime scenes, looking for signs of life processes or their absence to help determine events.

Assessment Ideas

Quick Check

Present students with images of various items (e.g., a bird, a toy car, a fossil, a mushroom). Ask them to write 'L' for living, 'D' for dead, or 'N' for non-living next to each item and provide one reason for their choice.

Discussion Prompt

Pose the question: 'Imagine a plant could not excrete waste. What would happen to it and why?' Facilitate a class discussion where students use their understanding of life processes to predict the outcome.

Exit Ticket

Give each student a card with one of the MRS GREN letters. Ask them to write the full name of the life process and one example of an organism demonstrating it. For example, for 'G', they might write 'Growth - a baby human getting taller'.

Frequently Asked Questions

What are the seven life processes in Year 4 science?

The seven life processes, or MRS GREN, are: Movement (self-locomotion), Respiration (energy release), Sensitivity (response to stimuli), Growth (increase in size), Reproduction (producing offspring), Excretion (waste removal), Nutrition (obtaining food). Use mnemonics and visuals to teach. Students apply them as a checklist to classify items accurately, linking to curriculum standards on living things.

How to differentiate living, dead, and non-living things for Year 4?

Living things perform all MRS GREN now; dead ones did in the past but cannot; non-living never have. Use object sorts with photos or specimens. Guide predictions on process failures to deepen understanding. This scaffolds key questions like rock vs plant comparisons.

How can active learning help teach what makes something alive?

Active methods like sorting real objects, observing live creatures, and role-playing processes make MRS GREN tangible. Pairs debate edge cases, such as seeds, revealing misconceptions through evidence. This collaborative approach builds ownership, improves retention over rote learning, and mirrors scientific inquiry, aligning with curriculum emphasis on practical skills.

What activities work best for MRS GREN in UK primary science?

Try carousel sorts, live observation logs, and prediction chains. These hands-on tasks fit 30-45 minute slots, suit small groups or whole class. They address standards by prompting classification and analysis, while stations manage differentiation for varying abilities.