CBSE Class 9 Science Natural Resources MCQs

Question: The life supporting zone of the earth is

a) Lithosphere

b) Biosphere 

c) Hydrosphere

d) Atmosphere

Answer: B

Question: Depletion of ozone molecules in the stratosphere is due to

a) Halogen compound

b) Fluorine compound

c) Chlorine compound

d) None of the options

Answer: A

Question: On moon the temperature ranges from -190 degree C to 110 degree C. This is due to

a) Water bodies present

b) No bio geo chemical cycle

c) No atmosphere 

d) No water bodies present

Answer: C

Question: Life cannot sustain on Mars and Venus because major component in atmosphere is

a) Carbon dioxide

b) Oxygen

c) Nitrogen

d) Ozone

Answer : A

Question: Molecules of proteins contain

a) All of the options

b) Carbon

c) Nitrogen

d) Oxygen

Answer : A

Question: Atmosphere maintain the temperature of earth because

a) It absorbs the heat rays

b) It contains water vapor

c) It reflects the heat rays

d) It hold air, which is bad conductor of heat 

Answer : D

Question: Nitrogen fixation can be done by

a) All of the options

b) Industries

c) Rhizobium

d) Lightening

Answer : A

Question: Greenhouse gases are

a) Rhizobium

b) Lightening

c) All of the options 

d) Industries

Answer : C

Question: Burning of fossil fuels add

a) CO₂, SO₂, NO₂, gases in air

b) C, SO₂, N₂, gases in air

c) CH₄, CO₂, NO₂, gases in air

d) CO, SO₃, NO₃, gases in air

Answer : A

Question: The micro-organisms which helps in formation of soil is

a) Lichen

b) Bacteria

c) Moss

d) B and c

Answer : A

Question. If there were no atmosphere around the Earth, the temperature of the Earth will
(a) increase
(b) go on decreasing
(c) increase during day and decrease during night
(d) be unaffected

Answer :   C

Question. Outer crust of earth is called ……………..
(a) Outer sphere
(b) Lithosphere
(c) Hydrosphere
(d) None of them

Answer :   B

Question. When we breathe in air, nitrogen also goes inside along with oxygen. What is the fate of nitrogen?
(a) It moves along with oxygen into the cells
(b) It comes out with the carbon dioxide during exhalation
(c) It is absorbed only by the nasal cells
(d) Nitrogen concentration is already more in the cells, so itis not at all absorbed

Answer :   B

Question. Microorganism living in pond called ………….. which is autotrophic
(a) Crab
(b) Fish
(c) Blue green algae
(d) Fungus

Answer :   C

Question. What would happen, if all the oxygen present in the environment is converted to ozone?
(a) We will be protected more
(b) It will become poisonous and kill all living forms
(c) Ozone is not stable, hence it will be toxic
(d) It will allow harmful sun radiations to reach earth and damage many life forms

Answer :   B

Question. Rainfall patterns depend on
(a) the underground water table
(b) the number of water bodies in an area
(c) the density pattern of human population in an area
(d) the prevailing season in an area

Answer :   B

Question. The protein deposited in the dead superficial cells that make the skin epithelium impervious to water is
(a) keratin
(b) elastin
(c) collagen
(d) mucus

Answer :    A

Question. In nutrient cycle, minerals tend to be dispersed through
(a) evaporation
(b) assimilation
(c) surface and sub-surface run off
(d) convection

Answer :   C

Question. Air, water, and soil is…………………….. component
(a) Biotic component
(b) Abiotic component
(c) A and b both
(d) None of them

Answer:    B

Question. Increase harmful substances in air called as……………..
(a) Air pollution
(b) Droplets
(c) Water vapor
(d) None of them

Answer :   A

Question. If the carbon dioxide content in the atmosphere is increased then which one of the following would not get affected?
(a) Amount of the heat retained by the environment
(b) Process of photosynthesis in plants
(c) Global warming
(d) Existence of desert plants

Answer:    D

Question. Ozone layer is getting depleted because of
(a) excessive use of automobiles
(b) excessive formation of industrial units
(c) excessive use of man-made compounds containing both fluorine and chlorine
(d) excessive deforestation

Answer :   C

Question. Total Earth’s surface covered by water is
(a) 75%
(b) 60%
(c) 85%
(d) 50%

Answer :   A

Question. Which step is not involved in the carbon-cycle?
(o) Photosynthesis
(b) Transpiration
(c) Respiration
(d) Burning of fossil fuels

Answer :   B

Question. Marked temperature changes in an aquatic environment can affect
(a) breeding of animals
(b) more growth of aquatic plants
(c) process of digestion in animals
(d) availability of nutrients.

Answer :   A

Question. mog is the mixture of
(a) smoke + CO2
(b) smoke + nitrogen
(c) smoke + fog
(d) smoke + ozone

Answer :   C

Question. Through which process is oxygen returned to the atmosphere?
(a) Combustion
(b) Photosynthesis
(c) Respiration
(d) Formation of nitrogen oxides

Answer :   B

Question. Which of the following is not a "Greenhouse gas" ?
(a) SO₂
(b) CO₂
(c) N₂O
(d) CH₄

Answer :   A

Question. The ‘water pollution’ can be defined in several ways. Which of the following statements does not give the correct definition?
(a) The addition of the undesirable substances to water bodies
(b) The removal of the desirable substances from water bodies
(c) A change in pressure of the water bodies
(d) A change in temperature of the water bodies

Answer:   C

Question. A pollutant is any substance, chemical or other factor that changes natural :
(a) Geo-chemical cycle
(b) Flora of a place
(c) Balance of our environment
(d) Wild life of a region

Answer:   C

Question. Water is ……………….. conductor of heat
(a) Good
(b) Bad
(c) More
(d) Less

Answer :   A

Question. Major component of the atmosphere on Mars and Venus is
(a) Carbon dioxide
(b) Oxygen
(c) Nitrogen
(d) Water vapour

Answer:   C