Ecological Concepts, Habitat, Niche, Population, Community and Ecosystem for SS 1

Class: SS 1
Term: Second Term
Week: 3
Age: 15 years
Duration: 60 minutes
Subject: Biology
Curriculum Theme: Society and Environmental Biology
Focal competence: Measuring the effects of ecological factors on the environment
Key competencies/values: Collaboration; Environmental Literacy; Research and Problem Solving; Problem Solving
Skills:

• Observing components of the ecosystem to classify them as biotic and abiotic
• Measuring ecological factors in an environment

Previous Lesson: Cell division and Cell processes
Topic: Basic Ecological Concepts
Subject Matter: Meanings of key ecological concepts, Ecological concepts

Specific Objectives

By the end of the lesson, pupils/students should be able to:

Cognitive Domain

• Define key ecological concepts such as ecology, environment, biosphere, lithosphere, atmosphere, habitat, niche, population, biotic community, and ecosystem.
• Explain the basic ecological concepts with relevant examples.
• Identify the basic components of an ecosystem.

Affective Domain

• Appreciate the interconnectedness of living organisms and their environment.
• Participate actively in group discussions about ecological factors.

Psychomotor Domain

• Classify observed components of the environment as biotic or abiotic.
• Distinguish between population and biotic community based on given examples.

Social Domain

• Collaborate effectively with peers in identifying ecological factors from video clips.

Reference Materials

The following resources were used in planning this lesson:

• 2025 New Revised Senior Secondary Education Curriculum (SSEC)
• Relevant State Unified Scheme of Work
• Modern Biology for Senior Secondary Schools by Sarojini T. Ramalingam
• The HeadTeacher Scheme of work For The New Revised Senior Secondary Education Curriculum (SSEC)

Instructional Materials

The teacher will teach this lesson with the aid of:

• Chart on ecological concepts and components of an ecosystem
• Video clips and simulations on components of an ecosystem
• Measuring tape
• Rain gauge
• Hydrometer
• Pictures of various habitats and organisms

Rationale for the Lesson

Understanding basic ecological concepts is fundamental to comprehending how living organisms interact with their surroundings. This lesson provides the foundational vocabulary and principles necessary for students to grasp more complex environmental issues and appreciate the importance of ecological balance. It also helps students develop an environmental literacy crucial for responsible citizenship.

Prerequisite/Previous Knowledge

Students should have a basic understanding of living organisms, their characteristics, and simple environmental interactions from their Junior Secondary Biology lessons.

Lesson Content/Board Summary

Basic Ecological Concepts

Meaning of Key Ecological Concepts

Ecology is the scientific study of the interactions between living organisms and their environment, including both biotic (living) and abiotic (non-living) components.

The environment refers to all the external conditions and factors, both living and non-living, that affect an organism or a community of organisms.

The biosphere is the part of Earth where life exists, encompassing the land, water, and atmosphere. It is the sum of all ecosystems.

The lithosphere is the rigid, outermost shell of a rocky planet, including the crust and the uppermost mantle. It represents the land component of the environment.

The atmosphere is the layer of gases surrounding Earth, held in place by gravity. It provides essential gases like oxygen and carbon dioxide and protects life from harmful radiation.

A habitat is the natural home or environment of an animal, plant, or other organism. It provides the necessary resources for survival, such as food, water, and shelter.

A niche describes the specific role or position an organism occupies within its ecosystem, including its interactions with other species and its use of resources. It is an organism’s “profession” or “way of life” in the ecosystem.

A population is a group of individuals of the same species living in the same geographical area at the same time.

A biotic community (or biological community) consists of all the different populations of various species living and interacting in a particular area.

An ecosystem is a community of living organisms (biotic components) interacting with their non-living physical environment (abiotic components) as a functional unit.

Basic Components of an Ecosystem

Ecosystems are composed of two main types of components:

1. Biotic Components: These are the living or once-living parts of an ecosystem. They include:
   1. Producers (Autotrophs): Organisms that produce their own food, mainly through photosynthesis (e.g., plants, algae).
   2. Consumers (Heterotrophs): Organisms that obtain energy by feeding on other organisms. They can be:
      1. Primary Consumers (Herbivores): Feed on producers (e.g., goats, rabbits).
      2. Secondary Consumers (Carnivores/Omnivores): Feed on primary consumers (e.g., snakes, humans).
      3. Tertiary Consumers (Top Carnivores): Feed on secondary consumers (e.g., eagles, lions).
   3. Decomposers: Organisms that break down dead organic matter, recycling nutrients back into the ecosystem (e.g., bacteria, fungi).
2. Abiotic Components: These are the non-living physical and chemical factors that influence living organisms and the functioning of the ecosystem. They include:
   1. Sunlight
   2. Water
   3. Temperature
   4. Soil
   5. Air (gases like oxygen, carbon dioxide, nitrogen)
   6. pH (acidity/alkalinity)
   7. Minerals and nutrients

Distinction Between Population and Biotic Community

The main differences between a population and a biotic community are:

1. Definition:
   1. A population refers to a group of individuals of the same species living in a specific area.
   2. A biotic community refers to all the different populations of various species that live and interact in a specific area.
2. Composition:
   1. A population is monospecific (composed of one species).
   2. A biotic community is multispecific (composed of many different species).
3. Interactions:
   1. Within a population, interactions are primarily intraspecific (e.g., competition for mates, resources among individuals of the same species).
   2. Within a biotic community, interactions are both intraspecific and interspecific (e.g., predation, competition, symbiosis between different species).
4. Scope:
   1. A population is a smaller, more specific ecological unit.
   2. A biotic community is a broader ecological unit, comprising multiple populations.
5. Example:
   1. All the Tilapia fish in a particular pond form a population.
   2. All the Tilapia fish, water lilies, frogs, insects, and bacteria in that same pond form a biotic community.

Teaching Methods/Instructional Techniques

Discussion, Explanation, Question and Answer, Group Work, Observation, Video Presentation

Instructional Procedures

Step 1: Introduction

Time: 5 minutes

Teaching Skill: Activating Prior Knowledge

Teacher’s Activity: The teacher greets the students and asks them to recall what they understand by “environment” and “living things”. The teacher then introduces the topic, “Basic Ecological Concepts,” and explains that they will learn how living things interact with their surroundings.

Pupils’ Activity: Pupils respond to the questions and listen attentively to the introduction.

Learning Point: Introduction to ecology

Step 2: Identifying Ecological Factors from Videos

Time: 10 minutes

Teaching Skill: Visual Learning/Observation

Teacher’s Activity: The teacher divides students into smaller groups and shows video clips or simulations of different environmental components (e.g., a forest, a river, a desert). The teacher guides the groups to identify various living (biotic) and non-living (abiotic) factors present in each environment.

Pupils’ Activity: Students watch the video clips in their groups and discuss to identify and list the biotic and abiotic ecological factors.

Learning Point: Biotic and abiotic factors

Step 3: Discussion of Ecological Concepts (Part 1)

Time: 10 minutes

Teaching Skill: Guided Discussion/Explanation

Teacher’s Activity: Using the chart on ecological concepts, the teacher introduces and explains the meanings of “ecology,” “environment,” “biosphere,” “lithosphere,” and “atmosphere.” The teacher provides simple, relatable examples for each concept.

Pupils’ Activity: Pupils listen, ask questions for clarification, and contribute to the discussion by giving examples.

Learning Point: Meanings of ecology terms

Step 4: Discussion of Ecological Concepts (Part 2)

Time: 10 minutes

Teaching Skill: Concept Elaboration

Teacher’s Activity: The teacher continues using the chart to explain “habitat,” “niche,” “population,” “biotic community,” and “ecosystem.” The teacher emphasizes the relationships between these concepts, using diagrams or pictures to illustrate.

Pupils’ Activity: Pupils pay attention, ask questions, and discuss the new concepts within their groups.

Learning Point: Understanding ecological relationships

Step 5: Identifying Ecosystem Components

Time: 5 minutes

Teaching Skill: Classification/Identification

Teacher’s Activity: The teacher asks students to identify the basic components of an ecosystem (producers, consumers, decomposers, and abiotic factors) based on the definitions and examples discussed. The teacher may use a simple diagram of an ecosystem for this.

Pupils’ Activity: Pupils identify and list the components of an ecosystem orally.

Learning Point: Ecosystem components identified

Step 6: Differentiating Population and Biotic Community

Time: 5 minutes

Teaching Skill: Comparison/Distinction

Teacher’s Activity: The teacher guides students to differentiate between “population” and “biotic community” by providing contrasting examples and highlighting the key differences in species composition and interactions.

Pupils’ Activity: Pupils discuss the differences and provide their own examples to distinguish between population and biotic community.

Learning Point: Population vs. biotic community

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

1. Define ecology.
2. List three abiotic components of an ecosystem.
3. What is the difference between a habitat and a niche?
4. Distinguish between a population and a biotic community.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Ecological concepts assessed

Step 8: Note-Taking

Time: 10 minutes

Teaching Skill: Guided Writing

Teacher’s Activity: The teacher guides pupils/students to copy the essential Board Summary notes on basic ecological concepts, components of an ecosystem, and the distinction between population and biotic community into their notebooks.

Pupils’ Activity: Pupils/students copy the notes carefully into their notebooks.

Learning Point: Recording lesson notes

Step 9: Conclusion

Time: 5 minutes

Teaching Skill: Consolidation

Teacher’s Activity: The teacher briefly summarises the main points of the lesson, reiterating the importance of understanding ecological concepts for appreciating environmental interactions. The teacher encourages students to observe their own environment and identify these concepts.

Pupils’ Activity: Pupils listen and ask any final questions.

Learning Point: Ecological concepts reinforced

Continuous Assessment/Further Study

Type: Homework

Instruction: Answer the following questions in your notebook:

1. Explain the term “ecosystem” and give two examples of different types of ecosystems.
2. Describe the role of producers and decomposers in an ecosystem.
3. Imagine your school compound. Identify one population and one biotic community within it. Justify your choices.
4. Research and write a short paragraph about how human activities can impact the biosphere.

Lesson Keywords

• Ecology – The study of interactions between organisms and their environment.
• Environment – All external factors affecting an organism.
• Biosphere – The part of Earth where life exists.
• Lithosphere – The solid, rocky outer part of Earth.
• Atmosphere – The layer of gases surrounding Earth.
• Habitat – The natural home of an organism.
• Niche – An organism’s specific role in its ecosystem.
• Population – A group of the same species in an area.
• Biotic Community – All different populations interacting in an area.
• Ecosystem – Living organisms interacting with their non-living environment.
• Biotic Components – Living parts of an ecosystem.
• Abiotic Components – Non-living parts of an ecosystem.

Differentiation

Support: Provide simplified definitions and more visual aids for students who struggle with abstract concepts. Pair weaker students with stronger ones for group activities. Focus on identifying and defining the core terms.

Extension: Challenge advanced students to research specific Nigerian ecosystems (e.g., mangrove swamps, savannah) and identify their unique biotic and abiotic components, or to discuss the concept of ecological succession.

Suggested Lesson Videos

For further understanding, search on YouTube for:

• “Basic Ecological Concepts for SS1 Biology”
• “Components of an Ecosystem explained”
• “Difference between Population and Community in Biology”