Class 9th Science Chapter – 14 Natural Resources MCQ with answer

(2) Nitrites can be converted into nitrates by _____?

A. Nitrobactor bacteria.
B. Nitrosomonas bacteria.
C.Symbiotic bacteria.
D. Ammonifying bacteria.

Answer – (A) Nitrobactor bacteria.

(3) Where is the ozone layer found in the atmosphere?

A. Troposphere
B. Stratosphere
C. Mesophere
D. Ionosphere

Answer – (B) Stratosphere

(4) ________ cause depletion of the ozone layer?

A. Water vapour
B. Greenhouse gases
C. Inert gase
D. Chlorofluorocarbons

Answer – (D) Chlorofluorocarbons

(5) The main biological process through which oxygen is returned to the atmosphere is ______?

A. Burning of fossil fuel
B. Respiration
C. Photosynthesis
D. Rainfall

Answer – (C) Photosynthesis

(6) Identify from the following which is not the control measure of water pollution?

A. Usage of natural manure
B. Usage of drip irrigation
C. Usage of fertilisers
D. Usage of natural pesticides

Answer – (C) Usage of fertilisers

(7) The factors which do not lead to soil formation in nature is _______?

A. Polythene bags
B. Sun
C. Water
D. Wind

Answer – (A) Polythene bags

(8) The factor responsible for the depletion of the ozone layer is?

A. Excessive use of automobiles.
B. Excessive use of man-made compounds containing both fluorine and chlorine.
C. Excessive formation of industrial units.
D. All of the above

Answer – (B) Excessive use of man-made compounds containing both fluorine and chlorine.

(9) Increased concentration of ______ in the air leads to global warming?

A. CO
B. CO₂
C. SO₂
D. N₂

Answer – (B) CO₂

(10) Which among the following gases does not contribute to greenhouse effect?

A. Methane
B. Carbon dioxide
C. Water vapour
D. Nitrogen dioxide

Answer – (D) Nitrogen dioxide

(11) The form of water which is suitable for drinking is ________?

A. Soft water
B. Potable water
C. Distilled water
D. Demineralised water

Answer – (B) Potable water

(12) Rainfall depends upon _____?

A. The prevailing season in an area
B. The underground water table
C. The density pattern of human population in area
D. The number of water bodies in an area

Answer – (A) The prevailing season in an area

(13) Identify among the pairs which is involved in both water cycle and oxygen cycle?

A. Lightening, evaporation
B. Transpiration, respiration
C. Photosynthesis, respiration
D. Burning of fuels, evaporation

Answer – (C) Photosynthesis, respiration

(14) What would happen if all the oxygen present in the environment is converted to ozone?

A. We will have greater protection from the UV rays of the Sun.
B. It will become poisonous and kill all living forms.
C. Ozone is not stable so it will be converted back to oxygen.
D. Harmful radiations from the Sun will reach the Earth and damage many life forms.

Answer – (B) It will become poisonous and kill all living forms.

(15) The process through which soil erosion can be prevented?

A. Afforestation
B. Excessive use of fertilizer
C. Deforestation
D. Overgrazing by animals

Answer – (A) Afforestation