Chapter 1 Environment 

NCERT Solutions for Class 7 Social science Chapter 1. Environment are provided here with simple explanations.

 

ncert-solutions-class-7-social-science-geography-chapter-1-environment
Environment

Question. 1 Answer the following questions-

 (a) What is an ecosystem?
Answer:-  All plants, animals and human beings depend on their immediate surroundings. They are also interdependent on each other. This relation between the living organisms as well as the relation between the organism and their surroundings form an ecosystem.

(b) What do you mean by natural environment?
Answer:- All the free gifts of nature are considered to be the natural environment. For  example:- Land, air, plants and animals.

(c) Which are the major components of environment?
Answer:- 1. Lithosphere,   2. Hydrosphere,   3. Atmosphere,   4. Biosphere.
(d) Give four examples of human-made environment.
Answer:- 1. Buildings  2. Parks  3. Roads  4. Shopping Malls.

(e) What is lithosphere?
Answer:- 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 is an irregular surface with various landforms such as mountains, plateaus, plains and valleys.
(f) Which are the two major components of biotic environment?
Answer:- Plants and animals.
(g) What is biosphere?
Answer:- Biosphere is the narrow zone of the Earth where land, water and air interact with each other to support life.
 
Question. 2  Tick the correct answer-

(1) Which is not a natural ecosystem?
(a) Desert
(b) Aquarium
(c) Forest
 
(2) Which is not a component of human environment?
(a) Land
(b) Religion
(c) Community
 
(3) Which is a human-made environment?
(a) Mountain
(b) Sea
(c) Road
 
(4) Which is a threat to environment?
(a) Growing plant
(b) Growing population
(c) Growing crops
 
Answer:- 1. (b) Aquarium 2. (a) Land 
3. (c) Road 4. (b) Growing population
 
Question. 3  Match the following-

Answer:-
 

(i) Biosphere

(e) Narrow zone where land, water and air interact

(ii) Atmosphere

(a) Blanket of air which surrounds the Earth

(iii) Hydrosphere

(b) Domain of water

(iv) Environment

(d) Our surroundings
 
Question. 4    Give reasons-
A)  Man modifies his environment.
Answer:-
1. He uses air for his survival.
2. He uses the land to build buildings, roads, and railways.
3. He tills land for agriculture.
4. He uses water.
 
B) Plants and animals depend on each other.
Answer:-
1. Plants provide food to animals.
2. Dead animals also provide humus content.
3. Wildlife adds beauty to the forests.
4. Animals also provide beauty to forests.
 
EXTRA-QUESTION
Question. 1  What is the barter system?
Answer- The barter system is a method of trade in which goods are exchanged without the use of money.
Question. 2  Name different types of water bodies.
Answer-  Rivers, lakes, seas, oceans, etc.
Question. 3 Why is our environment changing?
Answer- 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.