Living Things and What They Need

Active learning helps students move beyond memorizing MRS GREN to truly understanding what living things need for survival. Sorting, experimenting, and role-playing let students test ideas with their hands and minds, making abstract concepts like respiration and nutrition visible and meaningful.

• 5th Year
• The Living World: Senior Cycle Biology
• 4 activities
• 30 min–45 min

Learning Objectives

1. Classify organisms as living or non-living based on the MRS GREN criteria.
2. Compare the fundamental survival needs of plants and animals, identifying similarities and differences.
3. Explain how specific environmental factors, such as light or water availability, impact the survival of an organism.
4. Analyze the relationship between an organism's structure and its method of obtaining essential resources.

⏱ 30 min·Small Groups

Sorting Stations: Living vs Non-Living

Prepare stations with cards showing plants, animals, rocks, clouds, and robots. Groups sort items into living or non-living piles, then justify choices using MRS GREN. Rotate stations and discuss as a class.

Prepare & details

What makes something a living thing?

Facilitation Tip: During Sorting Stations, circulate with a checklist to note which pairs struggle with borderline items like fire or mushrooms, so you can address misconceptions immediately.

⏱ 45 min·Pairs

Seed Needs Experiment: Pairs Test

Pairs plant identical seeds in pots, varying one need: full light, no light; water daily, no water. Observe and chart growth over two weeks, noting effects on sprouting and health.

Prepare & details

What do all living things need to stay alive and healthy?

Facilitation Tip: For the Seed Needs Experiment, remind pairs to record only one variable change per setup to isolate what affects germination.

⏱ 40 min·Small Groups

Habitat Hunt: Outdoor Groups

Small groups walk school grounds to find living things, photograph them, and note evidence of food, water, air, shelter needs. Share findings in a class gallery walk with labels.

Prepare & details

How do plants and animals get what they need to live?

Facilitation Tip: In Habitat Hunt, give each group a small whiteboard to sketch their findings and add notes about shelter or food sources they observe.

⏱ 35 min·Whole Class

Role-Play Debate: Whole Class Needs

Assign roles as plants or animals defending needs in a mock council. Groups prepare arguments with evidence, then debate which need is most critical, voting on consensus.

Prepare & details

What makes something a living thing?

Facilitation Tip: During the Role-Play Debate, assign one student to keep time and another to track which needs are mentioned most often to guide discussion.

Teaching This Topic

Start with concrete examples students can touch or see, like seeds or small animals, to ground the abstract ideas in MRS GREN. Avoid starting with the mnemonic itself; instead, let students discover these characteristics through observation and experiment. Research shows that when students test ideas themselves, they correct misconceptions more effectively than through direct correction alone.

What to Expect

By the end of these activities, students will confidently classify living and non-living things using evidence, explain why organisms need specific resources, and apply these principles to design simple habitats. You’ll see students using data to justify decisions, not just repeating definitions.

Watch Out for These Misconceptions

Common Misconception

During Sorting Stations, watch for students who label plants as non-living because they don't eat food. Redirect them by having them examine a seedling’s roots absorbing minerals and leaves producing glucose to see the nutrients it still requires.

What to Teach Instead

During Seed Needs Experiment, provide two sets of seeds: one with all needs met and one with a missing nutrient like nitrogen. Students will observe stunted growth in the nutrient-deficient set, directly challenging the idea that plants need nothing beyond sunlight.

Common Misconception

During Seed Needs Experiment, watch for students who assume all seeds need oxygen to germinate. Redirect them by comparing sealed versus ventilated jars to show anaerobic seeds like rice can sprout without oxygen.

What to Teach Instead

During Habitat Hunt, ask students to find examples of organisms that live without oxygen, like bacteria in pond mud, and discuss how they meet their respiration needs in the habitat.

Common Misconception

During Sorting Stations, watch for students who include fire as a living thing because it moves or changes size. Redirect them by asking them to observe a controlled flame and note if it reproduces, grows cells, or responds to touch.

Assessment Ideas

Quick Check

After Sorting Stations, present students with images of a rock, a plant, a dog, a car, and a fungus. Ask them to write 'Living' or 'Non-living' next to each and provide one MRS GREN characteristic that justifies their choice, using the station materials as reference.

Discussion Prompt

During Role-Play Debate, note which students justify their alien habitat designs with specific evidence from the Seed Needs Experiment or Habitat Hunt. Use this to guide the discussion toward trade-offs, like how more food may require more water or shelter.

Exit Ticket

After Seed Needs Experiment, have students list two things all living organisms need to survive and one way a plant gets its food, contrasting it with how an animal gets food, referring back to their experimental results for evidence.

Extensions & Scaffolding

• Challenge students to design a poster comparing two organisms' needs, including one unusual example like a deep-sea vent organism.
• For students who struggle, provide labeled pictures of plants and animals with arrows pointing to where they get water, food, and shelter to scaffold their observations.
• Deeper exploration: Have students research extremophiles and present how these organisms meet their needs in extreme environments like salt flats or acidic lakes.

Key Vocabulary

MRS GREN	An acronym representing the seven characteristics of living things: Movement, Respiration, Sensitivity, Growth, Reproduction, Excretion, and Nutrition.
Photosynthesis	The process used by plants and some other organisms to convert light energy into chemical energy, producing glucose (food) and oxygen.
Respiration	The process by which organisms break down food molecules to release energy, typically requiring oxygen and producing carbon dioxide and water.
Nutrition	The process of obtaining and consuming food necessary for health and growth; for plants, this involves making their own food, and for animals, it involves consumption.
Habitat	The natural home or environment of an animal, plant, or other organism, providing the necessary shelter, food, and water for survival.