Our Environment Class 10 Syllabus and Key 2021

As a science student under CBSE, you will be familiar with Our Environment class 10 course needs. This chapter is in the syllabus to include the important aspect of nature and awareness. Hence, a brief idea about the topics and questions within its radius will help your knowledge too.

While the chapter is mainly about the environment, a lot of simple and complex topics are present. Things such as nature reserve, bio-degradable material, etc. are also a part of this unit. This will help you to score freely in your exams and also be a better follower of environmental studies.

Going through the NCERT book makes it easier and keeps you to the point while studying. A lot of wasteful efforts that go behind your syllabus can be put to other use. To simplify it, we give you a brief idea of the topic you will face in the chapter and the ways to deal with them.

Topics in Our Environment Class 10 Unit

Several topics from this subject and this unit become important at various levels. For example, many government exams like the administrative services, state services, etc. include this now. Hence, the list of topics we give you will help you throughout the whole learning curve.

It is also important to note that Our Environment class 10 is only a layer of ecosystem awareness. The subject also includes similar topics onwards of class 6th and goes on till class 12th. Meanwhile, the topics that fall under the radar can be different but the focus area remains the same.

S. NoTopic
1Atmospheric Air
2Food Chain and Web
4Garbage Management

Presence and Composition of Air

This becomes an easy topic for you to score and understand from the chapter of Our Environment. The different layers of Ozone, the condition of the atmosphere, and the presence of air are the main focus. The topic also helps you in knowing the combination of gases forming the atmospheric air.

By going through this half of Our Environment class 10 chapter, you get some key ideas. The composition of atmospheric air helps you in complex studies too. Moreover, how animals and plants differ in their use of this air is also an important part of the topic.

How air helps the soil and makes it rich and useful for plant survival is a key factor. Also, the different living beings and their place in the chain for using the atmospheric air is key.

Oxygen for Plants and Organisms

The most important information in this unit is the breakdown of oxygen and its availability. How the ecosystem gets this oxygen and how it goes back into the environment is a key question. The entire cycle of oxygen uses and replacement is important for your understanding of the ecosystem.

Trophic Levels

The trophic level comes across as another important part of Our Environment class 10 syllabus. While we are already aware of it before reaching the 10th, it is a scoring topic. Moreover, at least one question from this comes for the explanation of the ecosystem in every major exam.

Hence, we suggest you go through the topic and keep the notes handy while preparing. In simple words, the trophic level is the name for the different layers of the food chain in our environment. It shows how one being will depend on the other for the overall passage of energy.

For example, our theories always revolve around the sun being the main provider of all the energy. This energy goes directly to the fauna for their ability to go through photosynthesis. Once this energy breaks down, plant-eating animals get it through their diet in an indirect way.

Moving forward, the flesh-eaters then get this energy through their diet of the plant-eating animals. In this way, the energy passes through the levels with certain losses on the way. The passage is through different trophic levels that we commonly know as:

  • First trophic level (plants)
  • Second trophic level (sheep, goat, cow, etc.)
  • Third trophic level (Humans)

Other Important Topics

While the previous topics make one half of the unit, the other half focuses on waste management. For example, how the waste products behave in the environment, their decay, and the end. Moreover, the role of microorganisms in this process is also a key area of focus for the chapter.


The chapter of Our Environment class 10 has a lot of focus on the role of microorganisms. Their place in the ecosystem, how they are important, and their ways to survive. The chapter also clears a few confusions we usually have about these little beings and their role in waste handling.

A common role for these organisms is the ability to handle waste by decomposing it. However, they cannot handle waste materials of all nature. In general, the waste of plant decay and other remains is one form. Meanwhile, human waste further divides into 2 major forms.

Human Waste Types and Handling

We produce waste in different ways and it has a big impact on the natural system around us. Division of this into two groups will help your understanding on a basic level.

  • Biodegradable waste is the type that is possible for the microorganisms to handle and decompose. This waste usually comes from food remains human waste and anything of natural origin.
  • Non-Biodegradable waste is the type that comes from artificial or chemical sources. This type of waste is not possible for the microorganisms to handle or decay. Hence, it becomes a challenging task to handle them as they collect over time to unbalance nature.

Microorganisms treat the biowaste as they break it down into further components. A part of this acts as their food and gives them energy for multiplication too. Meanwhile, the remaining part slowly decomposes into the environment, air, or soil, leaving very few or no traces.

The problem comes with materials such as plastic, artificial rubber, etc. These things do not decay, do not degrade, and keep collecting and piling up. By doing so, the quantity of waste goes out of hand, harming the environment.

Question Pattern

The chapter handles 3 major parts within its syllabus at the class 10th level. Hence, there is at least one question available in the chapter about the ecosystem. In addition to this, there are 2 more questions about the food chain and its management and parts.

However, the majority of questions are from waste handling and waste management. The focus on waste types, decay, and environmental effects is quite clear too.

  • Questions on Ecosystem (1-2)
  • Questions on Food Chain (2)
  • Questions on Waste System and Decay (3-4)

Importance of the Chapter

In the examination, at least one small note and a big question come from this chapter. It acts as a big source of scoring important marks for a healthy total in the final. Hence, we suggest you have a close look and get familiar with this chapter at every level.

Our Environment class 10 gives a small understanding of the topics that wait for you ahead. The study of ecology and science comes from the roots of such chapters. This will help us to be aware of the roles and responsibilities we should play for the environment’s safety.

Frequently Asked Questions

  1. What is the larger role of the chapter about our environment in class 10th?

    A. The subject not only helps you for scoring marks but also raises your awareness. This gives us a better understanding of what nature needs us.

  2. Can we find the questions from this unit for direct learning?

    A. Yes, NCERT gives a direct guide to the questions from the units too. You get to read and understand them for answering reference.

  3. What are the chapters before and after the chapter of Our Environment class 10 syllabus?

    A. The chapter before is about sources of energy on our planet. The chapter which follows is about the sustainable development of the world.

  4. Do you include other information about similar chapters or topics for our use?

    A. Several units from different class levels are available for you to read and understand.

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