Natural Resources | Chapter Assessment | English | Grade 9

Which of the following gases is involved in air pollution? (a) Oxygen (b) Carbon dioxide (c) Sulfur dioxide (d) Carbon monoxide

• (a) (b) (c) (d)

• (a) (b) (c)

• (b) (c) (d)

• (a) (c) (d)

Answer explanation

Gases like carbon dioxide, sulfur dioxide and carbon monoxide causes air pollution.

What measures should Reena take to reduce air pollution? (1) Plant trees (2) Burn leaves and plastic (3) Reduce the use of fossil fuels (4) Use bicycle to travel

• (1) Plant trees (3) Reduce the use of fossil fuels (4) Use bicycle to travel

• (2) Burn leaves and plastic (3) Reduce the use of fossil fuels (4) Use bicycle to travel

• (1) Plant trees (2) Burn leaves and plastic (3) Reduce the use of fossil fuels

• (1) Plant trees (2) Burn leaves and plastic (4) Use bicycle to travel

Answer explanation

Reena should take following measures to reduce air pollution - (1) Plant trees (3) Reduce the use of fossil fuels (4) Use bicycle to travel Burning of leaves and plastic releases harmful gases in the atmosphere, that causes air pollution.

Tags

NGSS.MS-ESS3-3

Soil formation in nature does not occur due to

• wind

• sun

• temperature changes

• plastic bags

Answer explanation

Plastic bags are not responsible for soil formation, they are the cause of soil pollution. Factors responsible for soil formation are sun, wind, water, temperature changes.

The jacket of air surrounding the Earth is known as

• Troposphere

• Atmosphere

• Mesosphere

• Stratosphere

Answer explanation

The jacket of air surrounding the Earth is known as Earth's atmosphere. Troposphere, Mesosphere and Stratosphere are the layers of the atmosphere.

What will happen if hot water is released in the water reservoirs?

• There will be no change in water reservoir.

• Larvae of marine animals will die

• Marine plants and animals will die

• Both 2 and 3

Answer explanation

Marine animal and plants are used to a certain range of temperature. Sudden change in temperature will cause the death of plants and animals and their larvae.

Tags

NGSS.MS-LS2-1

Choose the correct option with respect to prevention of soil pollution.

• Burying plastic bags in the soil

• Excess use of pesticides on the crops

• Use of manure instead of fertilisers

• All of these

Answer explanation

To prevent soil pollution one can use manure instead of fertilisers. Excess use of fertilisers, pesticides, throwing garbage or burying plastic bags in the soil causes soil pollution.

Loss of topsoil can be prevented by

• Afforestation

• Proper irrigation

• Preventing overgrazing of animals

• All of these

Answer explanation

Top soil can be prevented by afforestation, proper irrigation methods, preventing overgrazing of animals, etc.

Which of the following organisms are responsible for soil formation?

• Aloe vera

• Neem tree

• Lichens

• Mushroom

Answer explanation

Lichens grow on stones and secretes some chemicals which causes weathering of rock / stones, resulting in soil formation.

In which of the following, nitrogen is found?

• Protein

• Urea

• Nucleic acid

• All of these

Answer explanation

Nitrogen is essential for all organisms. It is found in proteins, nucleic acid, urea, etc.

Which of the following is not an effect of global warming?

• Increase of ultraviolet rays on earth

• Rise in sea level

• Increase in earth's temperature

• Melting of glaciers

Answer explanation

Increase in the ultraviolet rays is the effect of ozone layer depletion. Effect of global warming are - Rise in sea level Increase of earth's temperature Melting of glaciers

Tags

NGSS.MS-ESS2-6

NGSS.MS-ESS3-5