Class 10 Science - HARYANA
Our Environment
The chapter 'Our Environment' in Class 10 Science explores how human activities impact the natural surroundings and the interdependence of living organisms. Students will learn about ecosystems, biotic and abiotic components, food chains, food webs, and trophic levels. A major focus is placed on environmental problems such as ozone layer depletion and the accumulation of biodegradable and non-biodegradable waste. For Haryana (BSEH) board exams, this chapter is crucial as it tests conceptual understanding of ecological balance and real-world environmental issues, frequently featuring direct questions on 10% law and biological magnification.
Start Learning FreeKey Concepts
Ecosystem
A self-contained unit of living organisms (biotic components) and their non-living environment (abiotic components) interacting together.
Food Chain and Trophic Levels
A linear sequence of organisms through which nutrients and energy pass as one organism eats another, divided into specific feeding steps called trophic levels.
Ten Percent Law
Only 10% of the energy entering a particular trophic level of organisms is available for transfer to the next higher trophic level.
Biological Magnification
The progressive accumulation of harmful non-biodegradable chemicals (like pesticides) in organisms at each successive trophic level.
Ozone Layer Depletion
The thinning of the protective ozone layer in the stratosphere primarily caused by synthetic chemicals like chlorofluorocarbons (CFCs).
Waste Management
The proper handling and disposal of garbage using biodegradable and non-biodegradable segregation, recycling, and the 3Rs (Reduce, Reuse, Recycle).
Important Formulas
Board Exam Info
In the Haryana (BSEH) Class 10 Science exam, this chapter typically carries about 2 to 4 marks. Questions usually include objective-type multiple-choice questions, short-answer questions on food chains or the 10% law, and a few reasoning questions based on ozone depletion or biological magnification.
Frequently Asked Questions
Energy flow is unidirectional because energy lost as heat to the environment during transfer between trophic levels cannot be recycled back to the sun.
Energy flow is unidirectional because the energy captured by autotrophs does not revert back to the sun, and energy lost as heat cannot be reused by organisms.
What is biological magnification and why does it affect top carnivores the most?
Biological magnification is the increase in concentration of toxic substances at successive trophic levels. Top carnivores are affected the most because they sit at the highest trophic level, accumulating the maximum amount of toxins.
How does the ozone layer protect life on Earth?
The ozone layer absorbs harmful ultraviolet (UV) radiation coming from the sun, preventing it from reaching the Earth's surface where it can cause skin cancer and damage eyes.
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