NCERT (CBSE) solutions of Class VII Social Science (Geography)
Chapter 1 Environment
(Important Questions only)
Q.1: Answer the following questions.
(i) What is an
ecosystem?
(ii) What do you mean by
natural environment?
(iii) Which are the major
components of the environment?
(iv) Give four examples
of human made environment.
(v) What is
lithosphere?
(vi) Which are the two
major components of biotic environment?
(vii) What is biosphere?
Solution:
(i) Ecosystem is the system formed by
the interaction of all living things with one another and with the physical and
chemical factors of the environment in which they live linked by transfer of
energy and material.
(ii) By natural environment we mean
the surroundings created by the nature. It comprises of the objects such as -
mountains, plateaus, plains, valleys, forests, land, air, river, ocean, water
and all living and non-living things etc.
(iii) Major components of the
environment include -
- Natural Components like, Land (Lithosphere), Water (Hydrosphere), Air (Atmosphere), Living things (Organism).
- Human made Components like, buildings, parks, bridge, road, industries etc.
- Humans like, individuals, family, community, religion, politics, education etc.
(iv) Examples of human made environment
are like, buildings, parks, bridge, road, industries etc.
(v) Lithosphere is the hard top layer
of the earth or crust consisting of rocks and minerals extending both over the
continents and ocean basins.
(vi) The two basic components of
biotic environment are: Plants and Animals.
(vii) Biosphere:
Plants and animals found in the narrow strip at the junction of lithosphere,
atmosphere and hydrosphere together make biosphere.
Q.2: Tick the
correct answer.
(i)
Which is not a
natural ecosystem?
a.
Desert
b.
Aquarium
c.
Forest
(ii)
Which is not a
component of human environment?
a.
Land
b.
Religion
c.
Community
(iii)
Which is a human
made environment?
a.
Mountain
b.
Sea
c.
Road
(iv)
Which is a threat
to environment?
a.
Growing plant
b.
Growing population
c.
Growing crops.
Solution: (i) b (ii) a (iii) c (iv) b
Q.3: Match the following.
(i) Biosphere
(ii) Atmosphere
(iii) Hydrosphere
(iv) Environment
|
(a) blanket of air which surrounds the Earth
(b) domain of water
(c) air surroundings
(d) narrow zone where land, air and water interact
|
Solution:
(i)d (ii)a (iii)b (iv)c
Q.4: Give reasons.
(a) Man modifies
his environment.
(b) Plants and
animals depend on each other.
Solution:
(a) It is true that man modifies
his environment. It is because -
- He uses water.
- Deforestation by which he clears land for agriculture, industries and habitation.
- He tills land for agriculture.
- He uses air.
- Numerous activities made to make the life comfortable.
(b) The interdependence of plants
and animals can be illustrated by the following points:
- Plants provide food to animals.
- Forests provide shelter to wild life.
- Wildlife adds beauty to forests.
- Animal dung provides manure for the growth of plants.
- The decay of dead animals provides nutrition to soil which in turn helps in the growth of plants and trees.
Further study -
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