Introduction to Ecosystems

Overview

Duration: 60 minutes
Class size: 30 students
Unit: Exploring Environment and Adaptation (Lesson 1 of 8)
Age group: Year 7 (11–12 years old)
Curriculum area: Science – Biology (Ecology)
National Curriculum References:

• Key Stage 3 Science Programme of Study - Biology: "Interdependence of organisms in ecosystems, including food webs and the effect of environmental change on ecosystems" (NC, 2014)
• Working scientifically objectives related to observing, classifying, and reporting findings

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Learning Objectives

By the end of the lesson, students will be able to:

• Define what an ecosystem is and identify its key components (biotic and abiotic factors)
• Classify elements within an ecosystem as biotic or abiotic
• Explain basic interactions within an ecosystem and the concept of a balanced environment
• Begin to appreciate the dynamic equilibrium required to maintain habitats and adaptations

Links to National Curriculum:

• Pupils should be taught to describe how living things are classified into broad groups (NC 3.1)
• Understand the interdependence of organisms in ecosystems and how environmental changes may affect this (NC 3.3)
• Use appropriate scientific vocabulary and begin to develop reasoning skills (Working Scientifically)

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Resources Needed

• Large printed images/posters of various ecosystems (forest, pond, desert)
• Sets of laminated cards labelled with biotic (e.g. plants, animals, fungi, bacteria) and abiotic factors (e.g. sunlight, water, soil, temperature)
• Whiteboards and markers (or mini-whiteboards) for group activities
• Interactive digital presentation (with animations illustrating ecosystem interactions)
• ‘Ecosystem Jigsaw’ worksheet for group work
• Exit ticket slips for quick assessment

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Lesson Breakdown

1. Starter Activity – What is an Ecosystem? (10 minutes)

• Engage: Show students a vibrant, animated short video (2-3 minutes) of different ecosystems (e.g. forest, pond) highlighting flora and fauna in interaction with their environment.
• Q&A Discussion: Ask, “What do you notice about the living things? What else do you see in their environment that helps or affects them?” Prompt discussion towards living and non-living elements.
• Class Definition: Elicit ideas and co-construct a working definition of an ecosystem on the board:
  “An ecosystem is a community of living things (plants, animals, microorganisms) interacting with each other and with their non-living environment (air, water, soil, climate).”

2. Teaching Input – Components of Ecosystems (15 minutes)

• Present the key vocabulary: Biotic (living) and Abiotic (non-living) factors.
• Display ecosystem posters; invite students to identify and categorise elements on the posters into ‘biotic’ and ‘abiotic’ using laminated cards.
• Use real-life examples familiar to students, e.g. local park ecosystem.
• Introduce the concept of interactions: feeding relationships, shelter, effect of sunlight and temperature, water availability.
• Highlight the idea of balance: if one factor changes, it can affect others (e.g., drought reducing water affects plants, which affect animals).

3. Group Activity – Ecosystem Jigsaw (20 minutes)

• Divide students into groups of 5-6.
• Hand out the ‘Ecosystem Jigsaw’ worksheet: a simplified diagram of an ecosystem with blank spaces for key biotic and abiotic factors and arrows for interactions.
• Task: Students fill in factors for a given ecosystem type, label them as biotic/abiotic, and draw arrows showing at least three interactions.
• Encourage creative thinking by asking how changing one factor may affect the others (e.g., what if a plant dies or water level drops?).
• Circulate to facilitate and prompt reasoning with questions.

4. Review and Consolidation – Interactive Quiz (10 minutes)

• Use mini whiteboards for a quick-fire quiz on biotic vs abiotic, definitions, and interactions.
• Example questions: “Is soil biotic or abiotic?”, “Give an example of a biotic factor in a pond.”
• Encourage students to explain answers briefly to reinforce understanding.

5. Plenary – Reflection and Exit Ticket (5 minutes)

• Ask students to write on a small slip:
  • One new thing they have learned about ecosystems
  • One question they still have
• Collect slips as a formative assessment to inform next lessons.

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Differentiation

• Support: Provide vocabulary sheets with definitions and pictures; pair lower ability students with peers for group work.
• Challenge: Extend higher ability students by asking them to consider how human activities might disrupt these factors and interactions (preparing for future lessons).

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Assessment

• Formative assessment during group work and quiz to gauge understanding of biotic/abiotic factors and ecosystem interactions.
• Exit tickets to evaluate individual student’s grasp of concepts and identify misconceptions or questions to address in subsequent lessons.

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Cross-Curricular Links

• Geography: Understanding habitats and environmental factors
• English: Use of scientific vocabulary and explanation skills
• ICT: Use of presentations and video for multimodal learning

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Homework Suggestion

Research and bring in a picture or object from local environment (e.g., garden, park) that represents either a biotic or abiotic factor, ready to share next lesson.

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Teacher’s Notes

• Emphasise scientific vocabulary to build literacy.
• Use questioning to develop curiosity and higher-order thinking (Why? How might this change affect the ecosystem?).
• Use real-world examples relevant to students to increase engagement and contextual understanding.

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This lesson is designed to inspire curiosity and establish a solid foundation for the subsequent lessons on habitats, food webs, and adaptation in this KS3 unit.