Class 8 Science - ODISHA
How Nature Works in Harmony
The chapter 'How Nature Works in Harmony' in Class 8 Science introduces Odisha students to the delicate balance of ecosystems, the interdependence of living organisms, and the cycling of materials in nature. It explains how energy flows through food chains and food webs, emphasizing the crucial roles played by producers, consumers, and decomposers. Students will learn about biodiversity conservation, natural cycles like carbon and nitrogen, and how human activities disrupt this ecological balance. Understanding these concepts is vital for the Board of Secondary Education (BSE) Odisha examinations, as questions frequently test students on ecosystem dynamics and environmental protection.
Start Learning FreeKey Concepts
Ecosystem
A self-sustaining community where living organisms interact with each other and their non-living physical environment.
Food Chain and Food Web
A food chain shows a linear sequence of who eats whom, while a food web is a complex network of interconnected food chains in an ecosystem.
Biogeochemical Cycles
The pathway by which chemical substances move through biotic and abiotic compartments of Earth, such as the water and carbon cycles.
Biodiversity
The variety of plant and animal life in a particular habitat, which is essential for maintaining ecological balance and resilience.
Ecological Balance
A state of dynamic equilibrium within a community of organisms where diversity remains relatively constant over time.
Important Formulas
Board Exam Info
This chapter typically carries around 4 to 6 marks in the Odisha (BSE) Class 8 Science annual examination. Common question types include short-answer questions defining ecological terms, distinguishing between food chains and food webs, and long-answer questions explaining the importance of maintaining nature's balance and the effects of human interference.
Frequently Asked Questions
What is the 10% law of energy flow in an ecosystem?
According to the 10% law, only about 10% of the energy entering a particular trophic level is available for transfer to the next higher trophic level.
Why is a food web more stable than a simple food chain?
A food web offers multiple alternative pathways for energy flow, so if one organism becomes extinct or its population drops, predators can feed on other available alternatives.
What happens if all decomposers are removed from nature?
Without decomposers, dead plants and animals would pile up, essential nutrients would remain locked inside dead matter, and the soil would become infertile, halting nutrient cycles.
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