Class 8 Science - CBSE
How Nature Works in Harmony
The chapter How Nature Works in Harmony explores the delicate balance within Earth's ecosystems, focusing on ecological interdependence, biogeochemical cycles, and the flow of energy. Students will learn how living organisms interact with each other and their physical environment to maintain a sustainable balance. For CBSE Class 8 students, this chapter is crucial as it forms the foundational base for higher-level environmental science, carrying significant weight in term exams through conceptual and diagram-based questions.
Start Learning FreeKey Concepts
Ecosystem
A functional unit of nature where living organisms interact among themselves and with their physical surroundings.
Food Chain and Food Web
A food chain shows the linear transfer of energy from one organism to another, while a complex interlocking network of multiple food chains is called a food web.
Nutrient Cycling
The movement and exchange of organic and inorganic matter back into the production of living matter through biogeochemical cycles like carbon and nitrogen cycles.
Biodiversity
The variety of plant and animal life in a particular habitat, which is essential for maintaining ecosystem resilience and stability.
Ecological Balance
A state of dynamic equilibrium within a community of organisms where diversity remains relatively constant over time.
Important Formulas
Board Exam Info
In CBSE Class 8 Science exams, this chapter typically carries around 6 to 8 marks. Common question types include short-answer questions on ecological definitions, differentiating between food chains and food webs, and diagram-based questions illustrating energy flow in an ecosystem.
Frequently Asked Questions
What is the Ten Percent Law in an ecosystem?
It states that only about 10 percent of the energy entering a trophic level is stored as biomass and passed on to the next trophic level, while the rest is lost as heat.
Why is a food web more stable than a simple food chain?
A food web provides multiple alternative pathways for energy flow, so if one organism dies or declines, predators can feed on other available alternatives.
How do human activities disrupt the harmony of nature?
Activities like deforestation, pollution, overfishing, and burning fossil fuels disrupt nutrient cycles, destroy habitats, and lead to a loss of biodiversity.
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