NCERT Class-9 Science Solutions: Chapter 14-Natural Resources Part 3

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Question 15:

Ozone-layer is getting depleted because of

  1. Excessive use of automobiles

  2. Excessive formation of industrial units

  3. Excessive use of man-made compounds containing both fluorine and chlorine

  4. Excessive deforestation.

Answer: C

Image Ozone-layer is getting depleted

Image Ozone-Layer is Getting Depleted

Image Ozone-layer is getting depleted

Question 16:

Which of the following is a recently originated problem of environment?

  1. Ozone layer depletion

  2. Greenhouse effect

  3. Global warming

  4. All of the above

Answer: D

Ozone depletion,Greenhouse, Global warming

Ozone Depletion,Greenhouse, Global Warming

Ozone depletion,Greenhouse, Global warming

Question 17:

When we breathe in air, nitrogen also goes inside along with oxygen. What is the fate of this nitrogen?

  1. It moves along with oxygen into the cells

  2. It comes out with the during exhalation

  3. It is absorbed only by the nasal cells

  4. Nitrogen concentration is already more in the cells so it is not at all absorbed.

Answer: B

Question 18:

Top-soil contains the following

  1. Humus and living organisms only

  2. Humus and soil particles only

  3. Humus, living organisms and plants

  4. Humus, living organisms and soil particles

Answer: D

Image shown the soil

Image Shown the Soil

Image shown the soil

Question 19:

Choose the correct sequences

Answer: B

Question 20:

Major source of mineral in soil is the

  1. Parent rock from which soil is formed

  2. Plants

  3. Animals

  4. Bacteria

Answer: A

Image Parent rock soil is formed

Image Parent Rock Soil is Formed

Image Parent rock soil is formed

Question 21:

Total earth’s surface covered by water is

Answer: A

Image total earth’s surface covered by water and land

Image Total Earth’S Surface Covered by Water and Land

Image total earth’s surface covered by water and land