A

Fill in the blanks.

i.

Cutting down of trees in large numbers is called …………………….…………….

ii.

Industries and ………………….………………. are main source of air pollution.

iii.

Deforestation allows strong wind and water to cause …………………….…………….

iv.

Killing of wild animals also affects the ……………………….…………. ecosystem.

v.

The wild animals directly depend on the forest for their ……………….………………….

vi.

Trees prevent ……………….………………….

vii.

People use different types of chemical fertilizers, pesticides and insecticides in the farm to increase ……………….………………….

viii.

Overuse of fertilizers and pesticides reduces ……………….…………………. of the soil as well as human ……………….………………….

ix.

Refrigerators and air-conditioners releases ……………….…………………. in the atmosphere.

x.

……………….…………………. from the vehicles and factories causes air pollution.

xi.

……………….…………………. protects us from the harmful ultraviolet rays of the sun.

xii.

Throwing of harmful chemical wastes from hospitals and factories to the river causes ……………….………………….

xiii.

……………….…………………. play a great role to improve or destroy the environment.

xiv.

Air, water and soil constitutes ……………….…………………. environment.

xv.

Plant and animal constitutes ……………….…………………. environment.

xvi.

Dumping of solid wastes like plastic bags, glass bottles and metal containers causes ……………….…………………. pollution.

xvii.

We celebrate World Environment Day every year on ……………….………………….

xviii.

World Environment Day is a day meant to think up ideas to save our ……………….………………….

xix.

Various water borne diseases like ……………….…………………. and ……………….…………………. are caused by water pollution.

xx.

The wearing or carrying away of topsoil by natural forces is called ……………….………………….

B.

State whether the following statements are TRUE or FALSE.

i.

Human beings are dependent on environment since their existence on the earth

………………………………..

ii.

The sewage should be discharged directly in the rivers.

………………………………..

iii.

National Parks and Wildlife conservation areas are important.

………………………………..

iv.

Unlimited population growth increases the pressure on the environment.

………………………………..

v.

Urbanization creates new needs and over exploitation of the natural resources.

………………………………..

C.

Give one word for each of the following.

i.

Planting trees in large numbers in bare hills.

………..……………………………….

ii.

Everything that surround us and constitutes living and non living components.

…………..…………………………….

iii.

Addition of harmful substances or harmful changes made in the environment mainly due to human activities.

…………..…………………………….

iv.

The chemical substances used in the fields for killing harmful insects and pests.

…………..…………………………….

v.

Destroying of ozone layer due to emission of harmful gases like CFC in the atmosphere.

………..……………………………….

vi.

A layer in the atmosphere made up of oxygen.

………..……………………………….

vii.

Killing of wild animals illegally.

………..……………………………….

A

Fill in the blanks.

i.

The state of atmosphere at a place and time regarding temperature, wind, rain etc is called …………….……………………..

ii.

Temperature is a measure of …………………………….……. and …………………………….……. of a body.

iii.

The …………………………….……. plays a vital role in changing weather.

iv.

Water is present in air in the form of …………………………….…….

v.

The amount of water vapour present in the air indicates …………………………….…….

vi.

When higher amount of water vapour is present in air, such air is said to be ……………………………

vii.

When water vapour in air comes in contact with cold leaves of plants, it condenses to form …………………………….…….

viii.

When the ground air becomes very cold in winter, water vapour freezes to form …………………………….…….

ix.

The movement of hot and cold air is called …………………………….…….

x.

…………………………….……. carries water vapour present in air to form cloud, rain, snow etc.

xi.

The temperature of a place falls down with the rise in …………………………….…….

xii.

…………………………….……. is the collection of tiny droplets of water in the sky formed by the condensation of water vapour present in air.

B.

State whether the following statements are TRUE or FALSE.

i.

Weather of a place remains constant for long time.

………………………………..

ii.

Weather in the valley is warmer than that in the mountains.

………………………………..

iii.

The amount of water vapour present in dry air is very high.

………………………………..

iv.

Weather forecasting is necessary to make some preparations for good weather.

………………………………..

v.

Terai region is located at very high altitude.

………………………………..

vi.

Cloudy day makes temperature rise.

………………………………..

vii.

Mist and fog in air reduces the visibility.

………………………………..

C.

Name the following.

i.

An instrument used to measure air pressure.

………………………………..

ii.

An instrument used to measure the maximum and minimum temperature of a day.

………………………………..

………………………………..

iii.

An instrument used to measure humidity.

………………………………..

iv.

An instrument used to measure the speed of the wind.

………………………………..

v.

An instrument used to show the direction if wind.

………………………………..

vi.

An instrument used to measure rain in millimeter.

………………………………..

vii.

An artificial satellite used for weather forecast.

………………………………..