Class 9 Science MCQ Natural Resources

Question :What is the constitution of nitrogen in our atmosphere?
(a) 28
(b) 78
(c) 55
(d) 92

Question :Which of the following bacteria is responsible for nitrogen fixation?
(a) Pseudomonas
(b) Nitrosomonas
(c) Rhizobium
(d) None of these

Question :One of the following factors does not lead to soil formation in nature.
(a) The sun
(b) Water
(c) Wind
(d) Polythene bags

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

Question :The main function of the Rhizobium bacteria is:
(a) To convert free nitrogen into nitrates
(b) To convert the nitrates into nitrogen
(c) Decomposition of ammonium salts
(d) Denitrification

Question :Soil pollution mostly occurs by:
(a) Water
(b) Fertilizers and insecticides
(c) Mining
(d) Crops

Question :What is the percentage constitution of carbon dioxide in the atmosphere of Venus and Mars?
(a) 95 – 97%
(b) 20 – 22%
(c) 35 – 40%
(d) 70 – 72%

Question :Oxygen is found in the elemental form in the atmosphere to the extent of:
(a) 78%
(b) 38%
(c) 21%
(d) 95%

Question : Which of the following bacteria is responsible for nitrogen fixation?
(a) Pseudomonas
(b) Nitrosomonas
(c) Rhizobium
(d) None of these

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

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

Question : Out of the total land area, how many million hectares of land suffer from degradation?
(a) 150
(b) 175
(c) 200
(d) 225

Question : One of the following factors does not lead to soil formation in nature.
(a) The sun
(b) Water
(c) Wind
(d) Polythene bags

Question : You must have observed that during the winters sometimesit becomes quite difficult to see even the objects short distance apart. This low visibility during the cold weather is due to:
(a) Formation of fossil fuels
(b) Unburnt carbon particles of hydrocarbons suspended in air
(c) Lack of adequate power supply
(d) None of these

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 living forms
(c) Ozone is not stable, hence it will be toxic
(d) It will help harmful Sun radiations to reach Earth and damage many life forms.

Question : Light bands of muscle fibre are made of the protein:
(a) Tubulin
(b) Myosin
(c) Actin
(d) Myoglobin

Question : The main function of the Rhizobium bacteria is:
(a) To convert free nitrogen into nitrates
(b) To convert the nitrates into nitrogen
(c) Decomposition of ammonium salts
(d) Denitrification

Question : A cool breeze after a hot day brings all of us considerable relief. This breeze is actually the moving air. What is the basic process that causes this movement of air?
(a) Pressure difference between the air of two regions
(b) Moving leaves of the plants
(c)Temperature difference between the two regions
(d) Striking of air with the mountains

Question : The two forms of oxygen found in the atmosphere are
(a) water and ozone
(b) water and oxygen
(c) ozone and oxygen
(d) water and carbon dioxide

Question : Haversian system is typically found in bones of
(a) fishes
(b) aves
(c) reptiles
(d) mammals

Question : Soil pollution mostly occurs by:
(a) Water
(b) Fertilizers and insecticides
(c) Mining
(d) Crops

Question : The nitrogen molecules present in air can be converted into nitrates by:
(a) A biological process of nitrogen fixing bacteria present in the soil
(b) A biological process of carbon fixing factor present in the soil
(c) Any of the industries manufacturing nitrogenous compounds
(d) The plants used as cereal crops in field

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

Question : Which of the following tissue has matrix, that is the source of its structural and functional performances?
(a) connective tissue
(b) muscular tissue
(c) nervous tissue
(d) epithelial tissue

Question : Oxygen is found in the elemental form in the atmosphere to the extent of:
(a) 78%
(b) 38%
(c) 21%
(d) 95%

Question : Top soil is the best for the vegetation. The main components ofthis productive top layer are:
(a) Humus and living organisms only
(b) Humus and soil particles only
(c) Humus, living organisms and plants
(d) Humus, living organisms and soil particles

Question : One of the following processes is not a step involved in the water-cycle operating in nature
(a) evaporation
(b) transpiration
(c) precipitation
(d) photosynthesis

Question : Nitrogen-fixation by bacteria does not occur in the presence of:
(a) Oxygen
(b) Hydrogen
(c) Carbon dioxide
(d) Sulphur

Question : The process of nitrogen fixation by bacteria does not take place in the presence of:
(a) Molecular form of hydrogen
(b) Elemental form of oxygen
(c) Water
(d) Elemental form of nitrogen

Question : Which of the following is not a greenhouse gas?
(a) Methane
(b) Carbon dioxide
(c) Carbon monoxide
(d) Ammonia

Question : Breakdown of bigger rocks into fine smaller mineral particles is called:
(a) Paedogenesis
(b) Mineralization
(c) Cracking
(d) Weathering

Question : Which of the following is a recently originated problem of environment?
(a) Ozone layer depletion
(b) Greenhouse effect
(c) Global warming
(d) All of the above

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

Question : Major source of mineral in soil is the
(a) parent rock from which soil is formed
(b) plants
(c) animals
(d) bacteria

Question : Volkmann’s canals occur in :-
(a) Cartilage
(b) Bone
(c) Internal ear
(d) Liver

Question : Biotic component of the biosphere is not constituted by
(a) producers
(b) consumers
(c) decomposer
(d) air

Question : Wrinkling in old age is due to
(a) collagen
(b) myosin
(c) keratin
(d) actin

Question : Oxygen is harmful for
(a) ferns
(b) nitrogen fixing bacteria
(c) chara
(d) mango tree

Question : Ozone layer is formed in the presence of
(a) ultraviolet rays
(b) infrared rays
(c) chlorofluorocarbon
(d) none of these.

Question : A hole in the ozone layer have been discovered above
(a) Australia
(b) America
(c) Antarctica
(d) Africa

Question : Which of the following abiotic factors lead to soil formation?
(a) Sun
(b) Wind
(c) Water
(d) All of these

Question : Which of the following is not a step in oxygen cycle?
(a) Condensation
(b) Combustion
(c) Respiration
(d) Photosynthesis

Question : Which of the following process does not produce carbon dioxide?
(a) Photosynthesis
(b) Respiration
(c) Combustion
(d) Decomposition of dead plants