The 2026-27 NCERT keeps Class 8 Science Chapter 12 How Nature Works in Harmony in full for the CBSE course. These class 8 science handwritten notes chapter 12 How Nature Works in Harmony follow the 2026-27 NCERT and cover biotic and abiotic components, population and community, interactions among organisms. This page hosts the notes PDF, key terms, and.
- CBSE Class 8 Weightage: a scoring chapter in the Science paper, asked in short and long answers.
- What the notes cover: biotic and abiotic components, population and community, interactions among organisms, ecosystems, aquatic and terrestrial.
- Best for: quick revision before Class 8 exams and a strong base for Class 9.
You can read the complete class 8 science handwritten notes for How Nature Works in Harmony, with key terms, boxed definitions, and quick revision points, in the PDF below.
These handwritten notes are written by subject teachers, mapped to the 2026-27 NCERT, and checked against the last five years of CBSE Class 8 Science papers.
How Nature Works in Harmony Topic-wise Weightage for CBSE Class 8 Science
Some parts of this chapter are asked more often than others. The table below shows which sub-topics to revise first, based on recent CBSE Class 8 question trends.
| Sub-topic | Weightage | CBSE Frequency |
|---|---|---|
| Food chains and food webs | High | asked often |
| Producers, consumers and decomposers | High | asked often |
| Ecosystem and its components | High | asked often |
| Population, community and biotic-abiotic components | Medium | asked sometimes |
| Types of interactions like mutualism and parasitism | Medium | asked sometimes |
| Balance and benefits of ecosystems | Low | asked rarely |
What the How Nature Works in Harmony Handwritten Notes Cover
This chapter is about how living and non-living things share a habitat and depend on one another. It covers populations, communities, ecosystems, food chains and webs, and how nature keeps a balance.
- Biotic and abiotic components
- Population and community
- Interactions among organisms
- Ecosystems, aquatic and terrestrial
- Producers, consumers and decomposers
- Food chains and food webs
- Trophic levels
- Decomposition and recycling of nutrients
- Types of interactions like mutualism and parasitism
- Balance in ecosystems and its benefits
Key Terms and Ideas in How Nature Works in Harmony
These are the terms and ideas the exam asks about most. Learn each one so you can define it and use it in your answers.
| Term / Idea | What it means |
|---|---|
| Biotic components | the living beings in a habitat, such as plants and animals |
| Abiotic components | the non-living things in a habitat, such as air, water and soil |
| Population | a group of the same kind of organism living together in a habitat |
| Community | different populations that share the same habitat |
| Ecosystem | biotic and abiotic components of a habitat interacting together |
| Producers | organisms like green plants that make their own food, also called autotrophs |
| Consumers | organisms that depend on others for food, also called heterotrophs |
| Decomposers | organisms like fungi and bacteria that break down dead matter and recycle nutrients |
| Food chain | a simple sequence showing who eats whom in an ecosystem |
| Food web | a network formed when many food chains are linked together |
How Collegedunia's Handwritten Notes Help You Revise How Nature Works in Harmony
These notes are made for the night before the exam. They keep the facts short and easy to scan. Collegedunia maps every point to the 2026-27 NCERT.
- Clear handwriting: each topic is written in neat, easy-to-read handwriting.
- Boxed key terms: the main terms and definitions are boxed by hand for fast recall.
- Diagrams and tables: simple hand-drawn tables and charts make ideas clear.
- Colour-coded headings: new sub-topics stand out, so you find any section in seconds.
How Nature Works in Harmony Self-Assessment Quiz
Try these quick questions after you read the notes. Tap each question to check your answer. They cover the points CBSE asks most often.
A group of the same kind of organism living together in a habitat is a?
(a) community (b) population (c) ecosystem (d) food web
Answer: (b) population - it is one kind of organism together in one place
Green plants that make their own food are called?
(a) consumers (b) decomposers (c) producers (d) herbivores
Answer: (c) producers - they make food by photosynthesis
Fungi and bacteria that break down dead matter are?
(a) producers (b) herbivores (c) carnivores (d) decomposers
Answer: (d) decomposers - they recycle nutrients back to the soil
A network of interlinked food chains is called a?
(a) food chain (b) food web (c) trophic level (d) population
Answer: (b) food web - many chains linked together form a web
In the relationship of ticks on a dog, the dog is?
(a) benefitted (b) unaffected (c) harmed (d) a producer
Answer: (c) harmed - this is parasitism, where one benefits and the other is harmed
How to Use These Handwritten Notes for Class 8 Science Revision
Use these class 8 science handwritten notes in two passes. Read them slowly once for the full chapter. Then, near the exam, read only the boxes and key terms for a fast recall.
- Read the notes once with the NCERT chapter open beside you.
- Say each key term and idea in your own words.
- Practise one long-answer question from a past paper.
- On the last day, revise only the key terms and the boxes.
Class 8 Science Handwritten Notes for All Chapters
The table below links the class 8 science handwritten notes for every chapter. Use it to jump to any other chapter's notes.
How Nature Works in Harmony Class 8 Science Handwritten Notes FAQs
Ques. Where can I download How Nature Works in Harmony Class 8 Science Handwritten Notes PDF?
Ans. You can download the How Nature Works in Harmony Class 8 Science Handwritten Notes PDF directly from this page. Both the Normal and HD versions are free.
Ques. Are these handwritten notes aligned with the 2026-27 NCERT?
Ans. Yes. These notes follow the current 2026-27 syllabus for Class 8 Science. the difference between a food chain and a food web
Ques. How many pages is the Class 8 Science How Nature Works in Harmony Handwritten Notes PDF?
Ans. The notes run about 20 pages. They cover the full chapter with key terms, hand-drawn boxes, and a short self-assessment quiz.
Ques. What is the main idea of the 8th standard Science chapter How Nature Works in Harmony?
Ans. The chapter explains that a habitat has living beings and non-living things that interact to form an ecosystem. Organisms are linked through feeding relationships in food chains and food webs, and these interactions keep the ecosystem in balance.
Ques. Are these How Nature Works in Harmony notes enough for the CBSE Class 8 exam?
Ans. Yes, for revision. The Collegedunia handwritten notes cover every key point and exam term. Read them with the NCERT chapter and practise past questions.
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