GEO (VII)-LESSON-1 ENVIORNMENT (QUESTION ANSWERS)

 

GEO (VII)-LESSON-1

ENVIORNMENT

(QUESTION ANSWERS)

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NCERT QUESTION ANSWERS

Question 1. Answer the following questions briefly.

1.    What is an ecosystem?

2.    What do you mean by the natural environment?

3.    Which are the major components of the environment?

4.    Give four examples of a human-made environment.

5.    What is the lithosphere?

6.    Which are the two major components of the biotic environment?

7.    What is the biosphere?

Answer:

1.    ECO SYSTEM- It 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, all linked by transfer of energy and material.

2.    Natural Environment-The things which are created by nature in our surrounding is called as natural environment. It comprise both biotic and  abiotic. For example-Land, water, air etc

3.    The major components of the environment are—natural (land, air, water, living things), human-made (buildings, parks, bridges, roads, industries, monuments, etc.), and humans (individual, family, community, religion, educational, economic, etc).

4.    Four examples of human-made environments—buildings, parks, bridges, and roads.

5.    Lithosphere-The solid crust or the hard top layer of the earth is called as lithosphere. There are various landforms on the lithosphere in continents and oceans floors like mountains, plateaus, plains, valleys, etc.

6.    Plants and animals are the two major components of a biotic environment,

7.    The biosphere is a narrow zone of the earth where land, water, and air interact with each other to support life. Thus, plant and animal kingdom together make biosphere, ie., the living world.

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 the 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 the environment?
(a) Growing plant              (b) Growing population
(c) Growing crops.

Answer:
(i)—(b), (ii)—(a), (iii)—(c), (iv)—(b).

Question 3. Match the following:

1.    Biosphere              (a)    blanket of air which surrounds the earth

2.    Atmosphere          (b)   domain of water

3.    Hydrosphere       (c)    gravitational force of the earth

4.    Environment      (d)    our surroundings
(e) the narrow zone where land, water, and air interact

Answer: 

1.    —(e)

2.    —(a)

3.    —(b)

4.    —(d)

Question 4. Give reasons:

1.    Man modifies his environment

2.    Plants and animals depend on each other.

Answer:

1.    Man modifies his environment in the following ways:

o    He cuts forests and clears land for agriculture, industries, and habitation.

o    He tills land for agriculture.

o    He uses the land to build buildings, roads, and railways.

o    He uses water.

o    He uses air for his survival.

o    He sets up industries, factories, etc.

o    He does numerous other activities for his life, making it comfortable.

2.  Plants and animals depend on each other in the following ways:

o    Plants provide food to animals.

o    They, in the form of forests, provide shelter to wildlife.

o    Wildlife adds beauty to the forests.

o    Animals provide manure to plants for growth.

o    Animals also provide beauty to forests.

o    Dead animals also provide humus content.

OTHER IMPORTANT QUESTIONS

1.     Which one of the following is a basic life support system?
(a) Music system
(b) Environment
(c) Transportation
(d) None of these

 

2.     Which one of the following is created by nature?
(a) Cars, scooters and buses
(b) Mountains, rivers and trees
(c) Roads, books, pen and copies
(d) All of these

 

3.     The domain of water is referred to
(a) hydrosphere
(b) lithosphere
(c) atmosphere
(d) biosphere

 

4.     What do plant and animal kingdom make together?
(a) Biosphere
(b) Hydrosphere
(c) Atmosphere
(d) All of these

 

5.     Which one of the fallowing animals is called the ship of the desert?
(a) Camel
(b) Goat
(c) Cow
(d) Dogs

6.     When is the World Environment Day celebrated every year?
(a) 25th December
(b) 23rd June
(c) 26th January
(d) 5th June

 

7.     Who interact with the environment and modify it according to their needs?
(a) Human beings
(b) Animals
(c) Rivers
(d) Mountains

 

 

8.     Which one of the following is not a threat to environment?
(a) Growing population
(b) Growing plants
(c) Growing industries
(d) All of these

 

ANSWERS

1	2	3	4	5	6	7	8	9	10
B	B	A	A	A	D	A	B

 

Match the contents of Column A with that of Column B.

Column A	Column B
1. Land	(a) lithosphere
2. Animals, plants	(b) atmosphere
3. Mountain, plateau and plains	(c) abiotic
4. Gases, water vapour, dust	(d) biotic

 

ANSWERS-1-C, 2-D,3-A,4-B

Fill in the blanks with appropriate words:

1. Hydrosphere is a part of …………….

2. Two main constituents of environment are …………. and …………..

3. …………. is the hard top layer of the earth.

4. …………. modify the natural environment.

ANSWERS-1. BIOSPHERE, 2-PLANTS AND ANIMALS, 3-LITHOSPHERE, 4-HUMAN BEINGS

Write whether the given statements are true or false:

1. Landforms are found only over continents.

2. Trade in which goods are exchanged without the use of money is called barter system.

3. Gravitational force of the earth holds the atmosphere around it.

4. No life can exist in biosphere.

5. Abiotic environment consists of living organism.

ANSWERS:-1- FALSE, 2-TRUE, 3-TRUE, 4-FALSE, 5- FALSE