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NCERT Class - 9 Science Solutions: Chapter 14 - Natural Resources Part 3
Question 15:
Ozone-layer is getting depleted because of
- Excessive use of automobiles
- Excessive formation of industrial units
- Excessive use of man-made compounds containing both fluorine and chlorine
- Excessive deforestation.
Answer: C
Question 16:
Which of the following is a recently originated problem of environment?
- Ozone layer depletion
- Greenhouse effect
- Global warming
- All of the above
Answer: D
Question 17:
When we breathe in air, nitrogen also goes inside along with oxygen. What is the fate of this nitrogen?
- It moves along with oxygen into the cells
- It comes out with the during exhalation
- It is absorbed only by the nasal cells
- Nitrogen concentration is already more in the cells so it is not at all absorbed.
Answer: B
Question 18:
Top-soil contains the following
- Humus and living organisms only
- Humus and soil particles only
- Humus, living organisms and plants
- Humus, living organisms and soil particles
Answer: D
Question 19:
Choose the correct sequences
Answer: B
Question 20:
Major source of mineral in soil is the
- Parent rock from which soil is formed
- Plants
- Animals
- Bacteria
Answer: A
Question 21:
Total earth՚s surface covered by water is
Answer: A