NCERT Solutions for Class 7 Social Chapter 1 - Complete Resource For Environment

1. Answer the following questions.

1. What is an ecosystem?

Ans: An ecosystem is the interaction between all the living beings with their physical and chemical environment i.e their surroundings. Generally, they are dependent upon each other.

2. What do you mean by natural environment?

Ans: All the free gifts of nature are considered to be the natural environment. For Example Land, water, air, plants and animals.

3. Which are the major components of the environment?

Ans: The major components of the environment are: 

• Lithosphere

• Hydrosphere

• Atmosphere

• Biosphere
  
  

4. Give four examples of human made environment.

Ans: Four examples of a human made environment are:

• Aquarium

• Shopping Malls

• Township Complexes

• Recreational Parks
  
  

5. What is lithosphere?

Ans: This is a layer of earth made up of rocks, minerals and a thin layer of soil i.e the solid earth's crust. It consists of various landforms like mountains, valleys, plains, plateaus, etc.

6. Which are the two major components of the biotic environment?

Ans: Biotic components of the environment refers to all the living things present around us. For example: Plants and animals.

7. What is biosphere?

Ans: It is a zone of earth where all the three land, water and air interact with each other to support life. All the plants and animals collectively make up our biosphere.

2. Tick the correct answer.

(i) Which is not a natural ecosystem?

(a) Desert 

(b) Aquarium 

(c) Forest

Ans: (b) Aquarium

(ii) Which is not a component of human environment?

(a) Land 

(b) Religion 

(c) Community

Ans: (a) Land

(iii) Which is a human made environment?

(a) Mountain 

(b) Sea 

(c) Road

Ans: (c) Road

(iv) Which is a threat to environment?

(a) Growing plant

(b) Growing population

(c) Growing crops

Ans: (b) Growing population

3. Match the following.

Ans:

4. Give reasons.

(i) Man modifies his environment.

Ans: Man modifies his environment to fulfill his growing needs everyday. For example: Forests are being cut day by day to construct buildings, this is due to the growing human population. A huge population cannot survive in a small area so he needs a larger area to live in. Thus, forests are being cut to make buildings and townships to accommodate the human population.

(ii) Plants and animals depend on each other.

Ans: Plants and animals depend on each other because mother nature has created this cycle for the existence of life on this earth. Animals consume plants to fulfill their needs and the dung of the animals work as manure for plants which in turn provides nutrients for the growth of the plants. So both are dependent on each other.

Introduction to The Ecosystem

The ecosystem is an amalgamation of the different components of the environment like plants, animals, human beings, etc. All of these components are interdependent for their survival. The interactions which exist among these living components of the environment is called the ecosystem. It is impossible to survive without depending on the other components of the natural environment. The ecosystem has a massive impact on our survival. We are dependent on the ecosystem since we are the consumers in the food chain.

Difference Between Natural and Human Environment

Natural Environment - The components of the natural environment are land, water, air, animals, etc. The various natural environments are lithosphere, atmosphere, hydrosphere, and biosphere.

Human-Environment - Human Environment, or artificial environment, on the other hand, includes human-made components. Humans can modify their environment according to their suitability. It has created depletion in the natural environment since the human environment removes the natural environment and imposes artificial environment. Humans need to learn how to use both of these harmoniously.

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Chapter 1 - Environment

Let us look at some of the important topics that are covered in Class 7 Social Science Chapter 1.

• Introduction to environment

• Components of environment

• Natural environment

• What is an ecosystem?

• Humanmade environment

Chapter wise NCERT Solutions for Class 7 Social Science (Geography) - Our Environment

• Chapter 2: Inside Our Earth

• Chapter 3: Our Changing Earth

• Chapter 4: Air

• Chapter 5: Water

• Chapter 6: Natural Vegetation and Wildlife

• Chapter 7: Human Environment

• Chapter 8: Human Environment Interactions

• Chapter 9: Life in the Temperate Grasslands

Related Questions

1. What do you mean by an ecosystem?

Plants, animals and human beings are interdependent. They tend to depend on their immediate surroundings for survival. These relations between them and their interdependence together constitute an ecosystem.

2. What is Lithosphere?

Lithosphere is the topmost layer of the earth's crust, the domain of land. It is the solid crust of the surface of the earth. The earth's surface is made up of rocks and minerals, and a layer of soil covers it. It has landforms like mountains, hills, plateaus, valleys, and plains which form its irregular surface.

Key Points at a Glance

Let us look at some of the most important points that will be discussed throughout the chapter.

• The term "environment" refers to the totality of all living and non-living components, as well as their effects on human life.

• An ecosystem is a system generated by the interactions of all living species with one another as well as the physical and chemical aspects of the environment in which they live, all of which are linked through the flow of energy and resources.

• Land, water, air, plants, and animals make up the natural environment. As a result, the natural environment encompasses both biotic (plants and animals) and abiotic (non-living entities) factors that exist on the planet.

• Natural, man-made, and human-made components make up the environment.