You will learn
- Define biodiversity.
- Sample with quadrats.
- Compare habitats.
- List threats.
Version 0.2 · expanded edition · built from cited public sources Content is based on the official frameworks and sources listed under Sources and standards. No official endorsement is claimed. Written in the style of common primary school assessments. No exam result is promised.
Student lesson
- Biodiversity is variety of life.
- Rich ecosystems are more stable.
- Quadrats help us sample.
- Habitat loss and pollution reduce biodiversity.
Words to know
the variety of living things in an area
a group of living things that can breed together
a square frame used to sample an area
no longer existing
1. Discover: The quadrat count
Kojo throws a 1-metre quadrat on the school field and counts five kinds of plants. In the garden by the wall he counts twelve. “The garden has higher biodiversity,” says his teacher.
Think: Why is variety useful?
2. Understand: Biodiversity
Idea 1: Variety
Biodiversity counts the many species in a place, the variety within species and the variety of ecosystems.
Idea 2: Sampling
A quadrat is a fixed-size frame placed at random. Count species inside several quadrats and compare areas fairly.
Idea 3: Threats
Habitat destruction, pollution, overhunting, invasive species and climate change reduce biodiversity. Some species become extinct.
3. Worked examples
Example 1 (I show you): Count
Quadrat.
- Frame.
- Species.
- Tally.
Answer: Count kinds of plants.
Example 2 (We do it together): Compare
Field and garden.
- Garden more.
- Higher.
- Variety.
Answer: The garden is richer.
Example 3 (You try): Explain
Threat.
Show the steps and answer
- Habitat loss.
- Fewer species.
- Pollution.
Answer: Habitat loss reduces variety.
Did you know?
The Congo Basin and Amazon rainforests each hold thousands of tree species found nowhere else.
Why this matters
Biodiversity gives us food, medicines and stable ecosystems.
4. Explore: Quadrat survey
Place 1 m² quadrats randomly in two habitats, tally species and compare results in a table and bar chart.
- Make a quadrat from string.
- Throw it randomly.
- Count species.
- Compare habitats.
Think about it: what did you notice?
What did you notice? The garden had more species than the mown field.
5. Practise
Say it in a sentence
Use these starters when you talk about the lesson. Say them out loud.
- ___ is the variety of living things.
- A ___ is a group that can breed together.
- A ___ is a square sampling frame.
- An ___ species no longer exists.
Guided practice
Question 1. What is biodiversity?
Variety of life.
Question 2. What is a species?
A kind.
Question 3. What is a quadrat?
Frame.
Independent practice
Level 1: Start
- What is biodiversity?
- What is a species?
- What is a quadrat?
- What is extinct?
- Name a threat.
Level 2: Grow
- Why random quadrats?
- Why variety?
- Why protect?
Level 3: Stretch
- Run the survey.
- Graph.
- Explain.
Answers are in the answer key below. Try first, then check.
6. Apply: Science in everyday life
Explain why high biodiversity helps an ecosystem.
Show a sample answer
Give two reasons.
Another one. Tell a family member one thing from this lesson. Use the words you learned.
Show a sample answer
A clear sentence that uses at least one word from Words to know.
7. Common mistakes
Fix: All life.
Fix: Rates are high now.
8. Lesson summary and revision card
- I can define biodiversity.
- I can sample with quadrats.
- I can compare habitats.
- I can list threats.
9. Check and master
Answer all 14 questions. You will see feedback after each one.
Your result appears here after you answer every question.
10. Key takeaways
- Biodiversity is variety of life.
- Rich ecosystems are more stable.
- Quadrats help us sample.
- Habitat loss and pollution reduce biodiversity.
11. Next lesson
Next lesson: Ecosystem conservation. Keep going with the next idea in this course.
Exam practice
These questions are written in the style of common school and international primary assessments. Try them on your own, without looking back. Then check your answers in the marking guide. The marks are shown in brackets.
- Define biodiversity, species and quadrat. [3 marks]
- Describe a quadrat survey. [3 marks]
- List two threats. [2 marks]
- Safety rule. [2 marks]
Total: 10 marks.
Marking guide and model answers
- 1 each
- Frame [1]; random [1]; count [1]
- 1 each
- Any [1]; reason [1]
Score guide: 9 to 10 = secure. 6 to 8 = nearly there, revise the parts you missed. Under 6 = work through the lesson again with a grown-up.
Printable worksheet
- What is biodiversity?
- What is a species?
- What is a quadrat?
- What is extinct?
- Name a threat.
- Why random quadrats?
- Why variety?
- Why protect?
- Run the survey.
- Graph.
Homework
Count five species in a small area at home.
Answer key and marking scheme
| Question | Expected response | Marks |
|---|---|---|
| 1. What is biodiversity? | Variety of life. | 1 |
| 2. What is a species? | A kind. | 1 |
| 3. What is a quadrat? | Frame. | 1 |
| 4. What is extinct? | Gone. | 1 |
| 5. Name a threat. | Habitat loss. | 1 |
| 6. Why random quadrats? | Fair. | 1 |
| 7. Why variety? | Stability. | 1 |
| 8. Why protect? | Needs of life. | 1 |
| 9. Run the survey. | Table. | 1 |
| 10. Graph. | Bar chart. | 1 |
| Total | 10 |
Independent practice answers. Level 1: 1 Variety of life.; 2 A kind.; 3 Frame.; 4 Gone.; 5 Habitat loss.. Level 2: 1 Fair.; 2 Stability.; 3 Needs of life.. Level 3: 1 Table.; 2 Bar chart.; 3 Sentence..
Quiz answers: 1 B, 2 C, 3 A, 4 B, 5 C, 6 A, 7 B, 8 C, 9 A, 10 B, 11 C, 12 A, Challenge 1 B, Challenge 2 C.
Mastery and remediation
| Objective | Bronze (Developing) | Silver (Proficient) | Gold (Advanced) |
|---|---|---|---|
| O1 Define biodiversity | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O2 Sample with quadrats | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O3 Compare habitats | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O4 List threats | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
Courseversity badge thresholds (overall quiz score): Gold = 90–100%; Silver = 80–89.9%; Bronze = 70–79.9%. A badge is never a full record of progress.
If a learner struggles
- Find the misconception: “Biodiversity means lots of animals.” All life.
- Explain another way: use real objects, pictures or actions first, then words.
- Show a simpler example: Measure biodiversity.
- Guided practice: work through one example together and let the learner try the next one.
- Reassess: use the quiz again or the worksheet.
- Move on when the learner shows Silver-level evidence independently.
For parents and guardians
In this lesson your child measures biodiversity. You do not need to be an expert to help.
- Count species outdoors.
- Ask “Which is richer?”
- Leave nests alone.
- Ask “how do you know?” after each answer, and listen.
- Praise effort, not only right answers. Mistakes are how we learn.
- Ten to fifteen minutes a day is better than one long session.
Teacher package
1–5. Objectives, prerequisites, materials, preparation, duration
Lesson objectives. Learners will: define biodiversity; sample with quadrats; compare habitats; list threats.
Prerequisite knowledge. Grade 4 ideas: habitats, simple food chains, producers and consumers, and adaptations of living things.
Materials. String, tally sheet. Low-resource options: use chalk or charcoal on a board or wall, drawings in the sand, and objects from the classroom instead of printed materials.
Preparation. Make quadrats.
Suggested duration. 45–60 minutes. It can be split into two shorter sessions.
6–9. Teaching procedure, explanation notes, guided and independent activities
Introduction (5 min). Show two habitats and ask, “Which has more kinds of life?”
Explanation (10 min). Teach biodiversity.
Guided activity (10 min). Learners survey.
Independent activity (10 min). Learners compare.
Assessment and reflection (5 min). Ask each learner to say one thing they learned and how they know it.
Key questions. How many species? Why protect?
Teacher explanation notes. Start with real objects and safe, hands-on observation. Then talk about what was seen, then draw and write. Always say “how do you know?”. Keep to the safety notes, and use local, safe materials.
10–12. Differentiation, formative assessment, common misconceptions
Support. Use real objects and pictures, short sentences and a partner. Let learners point, show or draw instead of writing. Extension. Ask learners to find a new example at home and explain how they know.
Formative assessment. Listen to learners read and explain, ask “how do you know?”, and check the independent work.
Misconceptions. “Biodiversity means lots of animals.” All life.
13–15. Assessment questions, answer keys, marking scheme
Use the quiz, the 10-mark exam practice and the worksheet on this page. All answers and marking guides are in the answer sections above. Re-check every answer before use.
16–19. Remediation, enrichment, homework, teacher reflection
Remediation. Measure biodiversity. Enrichment. Look for one new example near your home or school, draw it and explain it to someone. Homework. See above.
Teacher reflection. After teaching, record: which ideas learners understood; which misconceptions occurred; which activities worked; which learners need more practice; and what to improve next time.
Sources and standards
This lesson is based on the sources below, and no official endorsement is claimed. Reference starting points: Next Generation Science Standards, Cambridge Primary Science and the IB Primary Years Programme. Where a standard code is named, it points to the official framework.
Research used to shape this lesson. Courseversity Science curriculum, Grade 5 Unit 8, topic 9; Next Generation Science Standards, ecosystems: interactions, energy and dynamics; Cambridge Primary Science Stage 5, biology: living things in their environment; IB Primary Years Programme, sharing the planet. These sources informed the lesson.