Chapter 1. Environment Class 7 Geography Solutions English Medium-Additional Questions With Solutions

NCERT Solutions Class 7 Geography English Medium

Chapter 1. Environment

Topic: Additional Questions With Solutions

Additional - Question:

Que: What is the environment? 

Ans: Everything that we see in our surroundings forms environment. It is our basic life support system. It provides us air, water, food, and land—the basic needs of our life.

Que: Why is our environment changing?

Ans: Our environment is changing because our needs are increasing day by day. To fulfill these needs we often don’t think about the environment and start modifying it.

Que: What are the basic components of the natural environment?

Ans: The basic components of the natural environment are—land, water, air, plants and animals.

Que: What does the lithosphere provide us? 

Ans: Lithosphere provides us forests, grasslands for grazing land for agriculture and human settlements. It is a rich source of minerals.

Que: Name different types of water bodies.

Ans: Rivers, lakes, seas, oceans, etc.

Que: How is the atmosphere important for us? 

Ans: The atmosphere protects us from the harmful rays and scorching heat of the sun.

Que: What do you see in the deserts? Name some animals.

Ans: We see camels, snakes, lizards, and insects.

Que: What is the barter system?

Ans: The barter system is a method of trade in which goods are exchanged without the use of money.

Que: Distinguish between the biotic and abiotic environments with examples.

Ans: The world of living organisms is known as a biotic environment. Example: plants and animals.

The world of the non-living element is known as the abiotic environment. Example: land.

Que: How is the environment important for us?

Ans: It is important for us because it is the provider of air, water, food, and land— the basic necessities of life.

Que: Write a note on the lithosphere. 

Ans: The lithosphere is the solid crust or the hard top layer of the earth. It is made up of rocks and minerals. It is covered by a thin layer of soil. It is an irregular surface with various landforms such as mountains, plateaus, deserts, plains, valleys, etc. The lithosphere plays an important role in our life. It provides us forests, grassland for grazing, land for agriculture, and human settlements. It is also a treasure of various minerals.

Que: Give an account of the atmosphere.

Ans: Atmosphere is the thin layer of air that surrounds the earth. It is made up of various gases such as oxygen, nitrogen, carbon dioxide, dust particles and water vapor. The gravitational force of the earth holds the atmosphere around it. It protects us from harmful rays and scorching heat of the sun. The changes in the atmosphere produce changes in the weather and climate.

Que: How do human beings modify the natural environment? 

Ans: The needs of human beings are increasing day and day. Hence, they modify the natural environment to fulfill these needs. Sometimes they even destroy their environment Human beings have made cars for their convenience. These cars release fumes which pollute the air. They have established factories on land. These factories manufacture various items such as containers. This is how they modify natural environment.

Que: Give an account of various domains of the environment.

Ans: Various domains of the environment are:

1. Lithosphere

2. Atmosphere

3. Hydrosphere

4. Biosphere

5. It is the solid crust or the hard top layer of the earth. It is made up of rocks and minerals and covered by a thin layer of soil. It provides us forests, grasslands, and land. It is a source of mineral wealth.

6. It is the thin layer of air that surrounds the earth. The gravitational force of the earth holds the atmosphere around it. It protects us from harmful rays and scorching heat of the sun. It consists of various gases, dust, and water vapour.

7. It refers to various water bodies such as rivers, lakes, seas, oceans, etc. that exist on the earth.

8. The biosphere or the living world is comprised of plant and animal kingdom. It is a narrow zone of the earth where land, water, and air interact with each other to support life.

Que: How have human beings adapted to the environment to fulfill their needs?

Ans: Human beings from the early times have been interacting with the environment and modifying it according to their needs. Early humans adapted themselves to their natural surroundings. They led a simple life and fulfilled their requirements from the nature around them. But their needs kept on increasing. They became varied also. To fulfill these varied needs, humans learned to grow crops, tamed animals, and began a settled life.

The wheel was invented, surplus food was produced, the barter system emerged, trade started and commerce developed. The industrial revolution made possible large scale production. By and by transportation became faster. The information revolution made communication easier and speedy across the world. In this way, human beings adapted to the environment in order to fulfill their needs.

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