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NCERT Class - 9 Science Solutions: Chapter 14 - Natural Resources Part 2
Question 8:
Among the given options, which one is not correct for the use of large amount of fertilizers and pesticides?
- They are eco-friendly
- They turn the fields barren after some time
- They adversely affect the useful component from the soil
- They destroy the soil fertility
Answer: A
Question 9:
The nitrogen molecules present in air can be converted into nitrates and nitrites by
- A biological process of nitrogen fixing bacteria present in soil
- A biological process of carbon fixing factor present in soil
- Any of the industries manufacturing nitrogenous compounds
- The plants used as cereal crops in field
Answer: A
Question 10:
One of the following processes is not a step involved in the water-cycle operating in nature
- Evaporation
- Transpiration
- Precipitation
- Photosynthesis
Answer: D
Question 11:
The term “water-pollution” can be defined in several ways. Which of the following statements does not give the correct definition?
- The addition of undesirable substances to water-bodies
- The removal of desirable substances from water-bodies
- A change in pressure of the water-bodies
- A change in temperature of the water-bodies
Answer: C
Question 12:
Which of the following is not a greenhouse gas?
- Methane
- Carbon dioxide
- Carbon monoxide
- Ammonia
Answer: D
Question 13:
Which step is not involved in the carbon-cycle?
- Photosynthesis
- Transpiration
- Respiration
- Burning of fossil fuels
Answer: B
Question 14:
‘Ozone-hole’ means
- A large sized hole in the ozone layer
- Thinning of the ozone layer
- Small holes scattered in the ozone layer
- Thickening of ozone in the ozone layer
Answer: B