Class 7 Geography Chapter 1 Important Notes

Class 7 Geography Chapter 1 Important Notes include all the important points related Our Environment.

Environment

Any living and non-living things around us known as the environment. Objects, conditions, circumstances all are part of our environment.

Types of environment

(A) Natural Environment

  • Atmosphere
  • Lithosphere
  • Hydrosphere
  • Biosphere (Humans, Plants, Animals, etc.)

(B) Human-made environment

  • Buildings, Bridges, Roads, Parks
  • Industries Vehicles etc.
Class 7 Geography Chapter 1 Important Notes

Social environment

Things those are parts of societies, culture, lifestyles, etc.

  • Families
  • Communities

Elements of the Environment

(a) Biotic components: Living organisms like animals, humans, and plants, etc.

(b) Abiotic components: Non-living things like land, water, building, etc.

Class 7 Geography Chapter 1 Important Notes
Elements of environment

Natural Elements of the Environment

Class 7 Geography Chapter 1 Important Notes

Lithosphere

(Litho – the Greek word for rock or stone and Sphere – a word used for the area)

  • Solid crust or top layer of the Earth.
  • Made of rocks and minerals.
  • Found in the forms of various landforms i.e mountains, plateaus, plains, etc.

Hydrosphere

(Hydro – the Greek word for water. Similarly Aqua – Latin word for water)

  • Part of the Earth that contains water.
  • Oceans, Seas, Rivers, Lakes, Ponds, etc.

Atmosphere

(Atmos – the Greek word for vapor)

  • A thin layer of air around the earth.
  • Gravity (Pulling force by earth) keeps the air around the earth.
  • The atmosphere protects us from the harmful rays and heat of the sun.
  • Everyday changes in the atmosphere are called weather or climate.

Biosphere

(Bio – Life)

  • Narrow zone land, water, and air interact with each other.
  • The common part of the lithosphere, hydrosphere, and atmosphere.
  • Humans, Animals, plants, etc are part of the biosphere.
  • Sphere of life as all the living components are part of it.
Class 7 Geography Chapter 1 Important Notes

Ecosystem

  • A System where living and non-living elements of the environment interact with each other.
  • The ecosystem is a relation through which the exchange of nutrients and energy takes place in the biosphere.
  • Biotic and abiotic components are linked together through nutrient cycles and energy flows.
Class 7 Geography Chapter 1 Important Notes
Energy flows from bottom to top: Producers to Carnivores
Class 7 Geography Chapter 1 Important Notes

There can be various ecosystems depending upon the types of living and non-living elements of an area or zone.

Class 7 Geography Chapter 1 Important Notes

Types of Ecosystems

(Class 7 Geography Chapter 1 Important Notes)

1. Forest Ecosystems

  • Tropical forest ecosystems
  • Temperate forest ecosystems
  • Taiga (Boreal) forest ecosystems

2. Grassland Ecosystems

  • Tropical grassland ecosystems
  • Temperate grassland ecosystems

3. Taiga ecosystems

  • Boreal forest ecosystems

4. Desert ecosystems

5. Tundra ecosystems

6. Aquatic ecosystems

  • Marine or Seawater ecosystems
  • Freshwater ecosystems

The Sum of all the ecosystems established on planet Earth is called the Biosphere.

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