Short and Long Question Answers - Environment Class 7 Notes | EduRev

Social Studies (SST) Class 7

Class 7 : Short and Long Question Answers - Environment Class 7 Notes | EduRev

The document Short and Long Question Answers - Environment Class 7 Notes | EduRev is a part of the Class 7 Course Social Studies (SST) Class 7.
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SHORT ANSWER TYPE QUESTIONS

Q.1. Define natural environment. What are its domains?
Ans. All the objects created by nature comprise of natural environment. It includes both biotic as well as abiotic condition existing on earth. Lithosphere, hydrosphere, atmosphere is the domain of natural environment.

Q.2. What is hydrosphere?
Ans. The domain of water is referred to as hydrosphere. It comprises various sources of water and different types of water bodies like rivers, lakes, seas, oceans, etc. It is essential for all living organisms.

Short and Long Question Answers - Environment Class 7 Notes | EduRevFig: Hydrological Cycle


Q.3. Define environment?
Ans. Whatever we see surrounding us is our environment. Environment is our basic life support system. It provides the air we breathe, water we drink, the food we eat and the land where we live.

Q.4. What is Lithosphere?
Ans. Lithosphere 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 is an irregular surface with various landforms such as mountains, plateaus, plains, valleys, etc. Landforms are found over the continents and also on the ocean floors.

Q.5. What is Atmosphere?
Ans. The atmosphere 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 the harmful rays and scorching heat of the sun. It consists of a number of gases, dust and water vapour. The changes in the atmosphere produce changes in the weather and climate.

Short and Long Question Answers - Environment Class 7 Notes | EduRevFig: Layer of Atmosphere


Q.6. What is Biosphere?
Ans. Plant and animal kingdom together make biosphere or the living world. It is a narrow zone of the earth where land, water and air interact with each other to support life.


HOT QUESTIONS

Q.1. Explain “Impact of human activities on Natural environment as well as on human life”
Ans. 

  • Environmental pollution has affected humans, animals, plants and ecosystem.  Air, water, land and noise pollution has greatly affected the environment.
  • The depletion of ozone layer due to air pollution allows entering of UV rays from sun into the earth’s atmosphere which is associated with a number of health related and environmental issues. The depletion of ozone layer has effects in the form of global warming, which in turn leads to melting of polar ice, which will lead to rising sea levels and climatic changes around the world.
  • Environmental degradation has a host of negative outcomes that effect human beings both directly and indirectly such as increased poverty, famine, weather extremes and species loss.
  • Garbage from households and industrial units causes damage to local ecosystems, and it is a threat to plant and animal life. For example, landfills serve as a popular dining location for birds and other animals, but some of what they eat can cause diseases. Garbage and liquid waste that end up in water bodies negatively change the chemical composition of the water thereby causing water pollution.

Q.2. How did human interaction with the environment change over time?
Ans. Human beings interact with the environment and modify it according to their need. Early humans adapted themselves to the natural surroundings. They led a simple life and fulfilled their requirements from the nature around them. With time needs grew and became more varied. Humans learn new ways to use and change environment. They learn to grow crops, domesticate animals and lead a settled life. The wheel was invented, surplus food was produced, barter system emerged, trade started and commerce developed. Industrial revolution enabled large scale production. Transportation became faster. Information revolution made communication easier and speedy across the world.

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