Environment | Geography VII | Class 7th | Questions and Answers

 

JANDKNCERT | Social Science | Our Environment

Environment | Geography VII | Questions and Answers

 

Chapter 1: Environment

1. Answer the following questions

(i) What is an ecosystem?
An ecosystem is a system formed by the interaction of all living organisms with each other and with the physical and chemical factors of the environment in which they live. It includes both biotic (living) and abiotic (non-living) components.

(ii) What do you mean by natural environment?
Natural environment consists of all living and non-living things that occur naturally on Earth. It includes land, water, air, plants, and animals.

(iii) Which are the major components of the environment?
(i) Natural components (land, water, air, plants, animals)
(ii) Human-made components (buildings, parks, bridges, roads)
(iii) Human beings (individuals, families, communities)

(iv) Give four examples of human-made environment.
(i) Roads
(ii) Buildings
(iii) Parks
(iv) Monuments

(v) What is lithosphere?
The lithosphere is the solid outer layer of the Earth that includes the crust and the uppermost mantle. It is made up of rocks and minerals and forms landforms like mountains, plateaus, and plains.

(vi) Which are the two major components of biotic environment?
(i) Plants
(ii) Animals

(vii) What is biosphere?
The biosphere is the narrow zone of Earth where land (lithosphere), water (hydrosphere), and air (atmosphere) interact to support life. It includes all living beings and their relationships with the environment.

2. Tick the correct answer

(i) Which is not a natural ecosystem?
(b) Aquarium

(ii) Which is not a component of human environment?
(a) Land

(iii) Which is a human-made environment?
(c) Road

(iv) Which is a threat to environment?
(b) Growing population

3. Match the following

Column A	Column B
(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

4. Give reasons

(i) Man modifies his environment
(i) Man modifies his environment to fulfill his needs and make life comfortable.
(ii) With the advancement of science and technology, humans have changed natural surroundings by building houses, roads, industries, etc.

(ii) Plants and animals depend on each other
(i) Plants produce oxygen and food which animals need.
(ii) Animals produce carbon dioxide that plants need for photosynthesis.
(iii) This interdependence helps maintain balance in nature.