b. Fill in the blanks.
1._______________
is a narrow belt or zone of the earth where all forms of life exist.
aby
2.An envelope of the air surrounding the earth is called
__________
3.________________
is the upper surface of the earth consisting of rocks.
4.A highly elevated land from the surroundings with very steep slopes is known as______________
5. An upland with rugged surface is called____________
Answers
Answer:
a. Environment : Surroundings of an organism, a
community or an object.
b. Physical environment : The prevailing natural conditions such as
land, water and air.
c. Biological environment : Environment which includes humans,
animals and plants etc.
d. Atmosphere : The thin layer of air which envelops our
earth.
e. Lithosphere : Layer of the earth comprising rock
materials, extending to continents and
ocean basins.
f. Hydrosphere : Part of the earth’s surface covered with
water.
g. Biosphere : A very narrow sphere of the earth which
sustains life.
h. Biodiversity : Wide range of species.
II. ANSWER THESE QUESTION:
Q1. Why do we study natural environment? What is its importance?
Ans. We study natural environment because all humans are influenced by the physical and natural environment. Not only human beings but also plants and animals are influenced by
the environment. Natural environment are quite necessary for the existence and development of human beings.
Q2. What is atmosphere? Why is it important for us?
Ans. The air-envelop that surrounds the earth is called the atmosphere
Importance of the Atmosphere
The atmosphere is very important to us. It has many advantages of its own:
(1) The atmosphere acts like a blanket or a glass house for the earth. It receives the radiation of the sun but does not allow the insulation to escape. As such, it keeps the earth warm.
(2) Water vapours and carbon dioxide present in the lower layers of the atmosphere absorb the heat radiated by the earth’s surface and keep the atmosphere warm even during night.
(3) Had there been no atmosphere, the extremes of temperature between the day and night would have been much greater.
Q3. Why should we protect our environment?
Ans. we should protect our environment because:
1. It provides us with various necessities of life such as air to breathe, water to drink, food to eat and land to live.
2. It provides us different natural resources like plants, wood, fuel, minerals and energy.
3. Irrational use of our natural resources like forests, pastures, farms, and minerals etc. would harm us to such an extent that no reform measures later on would do anything to repair
the loss already done.
Q4. In which ways do the humans influence the environment?
Ans. Humans influence the environment in a number of ways :
1. If they go on cutting the jungles and trees mindlessly, they would soon cause the depletion of oxygen in the atmosphere.
2. If we go on using our mineral wealth indiscriminately, soon we would be deprived of this great gift of nature.
1)......biosphere
2)......atmosphere
3)......crust
4).......Plateaus
5).......sealevel
Hope it helps you...
Have a wonderful day ahead ☺