Our Environment Class 10 Notes Science Chapter 15


Our Environment Class 10 Notes CBSE Science Chapter 15

CBSE NCERT Class 10 Notes Science contains physics, chemistry and biology notes of chapter 15 Our Environment topics given in textbook are part of Revision Notes for Class 10

Read also CBSE Class 10 Chapter-wise Science Notes

According to new CBSE Exam Pattern, Short Answer typ questions and MCQs Science is one of the important subject of class 10th of the CBSE because it is a crucial sub-subject of Science 

Here we have given NCERT Science

According to new CBSE Exam PatternScience Notes cover an overview of the main given points of every concepts and Topics in the NCERT TextBooks Class 10th Science this Chapter Notes includes topic/concepts wise explanations for all the topic provided in the book such as Biomagnification , Accumulation, Pesticides, Ozone depletion, Waste , Components of Ecosystem , biodegradable and non biodegradable, Environment, Wastes , Biotic components, ozone layer depletion., Trophic level, Bioaccumlation , food chain and Efforts to Protect Environment 

Our Environment Class 10 Notes Pdf Chapter 15 Science

Well prepared Class 10th Science Notes will guidance students understand the topics ,concepts and themes covered in all the chapters of Ncert Text book of 10th 

Our Environment

-All biological (plants, animals, micro-organisms etc.) and physical (Soil,

Water, air, sunlight etc.) Surroundings around us create our environment.


ving constituents

All interacting organisms in an area together with no of the environment form an ecosystem.

Types of Ecosystem

Natural Ecosystem

-It exists in nature without any human interference

Example - Pond, River,


Made by humans for their own interest Example Aquarium, Garden

Components of Ecosystem

Biotic Components

Abiotic components [Non-living components]

[living components]

All the living organism of a

certain area like plants, animals

humans, microbes etc.

-All climatic factors like rain,

humidity, temperature inorganic

substances like oxygen, nitrogen







aura Organism which prepare their own food from simple inorganic substances like carbon dioxide and water by using sunlight energy in the presence of chlorophyll

Ex. Green plants and certain blue-green algae


Those organism which consume food prepared by producers are called





Those animals which eats only plants

Those animals which eats only other

-Those animals which eats both plants and

animals as food.


-Ex. Goat, Sheep etc.

Ex Lion, Tiger etc.

-Ex. Man, Dog


Micro-organism that break down the complex organic compounds present in dead organism into simpler substances. Su

-Ex. Certain bacteria and Gaur

Food Chain

The flow of nutrients and energy from one organism to another at different trophic levels forms a food chain.

-Food chain represents a single unidirectional transfer of energy.

- Food chain starts with producer.


Food Chain(producer)

Grasshopper -10-10-10 (Herbivore)


A food chain shows how energy moves from plants te animals

Eagle (Top carnivore)

Food Web Gaurd

-Several Interconnected food chains forms a food web Single food chain doesn't naturally occur in an ecosystem.



Trophic Levels

The various steps in a food chain at which the transfer of food (or energy) takes place are called trophic levels





There are generally a greater number of individuals at the lower trophic levels of ecosystem, the greatest number is of producers

The energy transfer is never 100% Thus, each successive trophic level receives lesser energy than previous resulting in a pyramid sh

Percent Law

Only 10 percent of the energy entering a particular trophic level of organisms is available for transfer to the next higher trophic level.




10 J



Energy Pyramid


Bioaccumulation refers to the accumulation of a toxic chemical in the tissue of a particular organism. It occurs in a single organism over lifetime


Biomagnification refers to the increase in concentration of harmful chemical substances in the body of living organism at each trophic levels of a food chain.

It expands over different trophic levels.

Organisms at the higher trophic levels have higher concentration of such chemicals

Eg. In the below case, man will have the highest amount of pesticides






Ozone Layer Depletion

How Do our Activities Affect the Environment

Ozone molecule is (0.) fa atoms of oxygen combined together

Ozone layer protects the life on earth from harmful ultraviolet radiations coming from sun.

Ultraviolet rays can cause skin cancer.

How Ozone is formed:

- Ozone is formed high up in the atmosphere by the action of ultraviolet radiation on oxygen gas.

UV (Ozone)

Reason of Ozone Depletion

-Chlorofluorocarbon (CFC) is one of the major chemicals that deplete the ozone layer. CFC is found in coolant, fire extinguisher etc. 

Efforts to protect

- In 1987, United Nations Environment Programme (UNEP) forged an agreement among its member countries to freeze CFC production. 

Managing the Garbage we produce

Waste Biodegradable

Wastes that can be broken down by biological processes.

Ex. Vegetable waste, paper cups, Kulhad



Wastes that can't broken down by biological processes

- Ex. Polythene bags. Glass etc.

Management aura

These are Landfills, Incineration, Composting, Sewage treatment, Recycling etc.

Efforts on Individual Level

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Importance of Class 10th Science Notes

The 10th grade includes the three branches of Science: Physics, Chemistry, and Biology, which are consolidated into a single textbook. This subject is conceptually dense, and achieving high marks requires a clear understanding of these concepts. To facilitate this, we offer easy-to-follow and detailed Class 10 Science Notes, which will aid in comprehending the material and answering exam questions. Additionally, the NCERT Science Revision Notes contain important points for quick review, allowing for efficient chapter comprehension. Simply select your desired chapter from the list below.

Our team has Carefully reviewed several past year question papers to create the most beneficial Science Class 10 Notes. At Physics Wallah, our mission is to provide accessible and superior education. Our study materials are available in Pdf format and can be accessed on various devices. The Physics Class 10 Notes are easily downloadable with a single click. 

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