NCERT Class 7 Geography Chapter 1 Notes cover all the important notes from the chapter Environment. NCERT Class 7 Geography Chapter 1 Notes are easy to understand and learn. NCERT Class 7 Geography Chapter 1 Notes can be used for a quick revision of the chapter.

NCERT Class 7 Geography Chapter 1 Notes

NCERT Class 7 Geography Chapter 1 Notes

Environment

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

Class 7 Geography Chapter 1 Important Notes

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 that are parts of societies, cultures, lifestyles, etc.

Examples:
>Families
>Communities
>Education system
>Economy
>Market, etc

 

Elements of the Environment

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

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

Class 7 Geography Chapter 1 Important Notes

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)

All forms of the water on the earth is called hydrosphere.
Example: Oceans, Seas, Rivers, Lakes, Ponds, etc.

Atmosphere

(Atmos – the Greek word for vapor)

A thin layer of air around the earth is called the atmosphere.
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 biosphere contains all the life-supporting elements.

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

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

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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