CBSE Questions for Class 9 Biology Natural Resources Quiz 5 - MCQExams.com

When precipitation comes down to the earth in the liquid form, it is called ______.
  • Cloud
  • Rain
  • Snow
  • Ice
Water logging of soil makes it physiologically dry because:
  • This condition does not allow the capillary force to work.
  • This condition does not allow oxygen to enter the soil.
  • Both A and B
  • None of the above
Major component of the atmosphere on venus and mars planets is
  • Carbon dioxide
  • Oxygen
  • Hydrogen
  • Water vapours
Nitrification means:
  • Conversion of nitrates into ammonia
  • Conversion of ammonia into nitrates
  • Conversion of nitrogen into salts nitrogen
  • Conversion of nitrogen salts into free nitrogen
The changes in the atmosphere produce changes in the weather and ______________.
  • Behaviour
  • Climate
  • Rays
  • Gases
If there is no atmosphere around the earth, the temperature of the earth will
  • Increase continuously
  • Go on decreasing
  • Increase during day and decrease during night
  • Remain uneffected
Water containing harmful impurities is said to be polluted. Pollution occurs due to :
  • Dumping of untreated sewage
  • Factory wastes
  • Both A and B
  • Afforestation
Weathering of rocks occurs due to:
  • Strong winds
  • Flowing water
  • Heating and cooling of rocks
  • All of the above
The top most layer of soil contains
  • Humus, living organism and soil
  • Human, living organism and plants
  • Humans and soil particles
  • Human and microorganism
The salinity of seawater is 3.5%, which means that every litre of seawater contains 35g of salt. 'Freshwater fish can survive in the salty oceans and seas' the given statement is ________.
  • True
  • False
  • Partially true
  • Partially false
  • None of these
The two forms of oxygen formed in the atmosphere are
  • Water and ozone
  • Ozone and oxygen
  • Water and oxygen
  • Water and carbon dioxide
The percentage of nitrogen in the atmosphere is:
  • 86%
  • 78%
  • 21%
  • 1%
This is the source of water for lakes and wells.
  • Sea
  • Rain 
  • River 
  • Pond
  • Ocean 
Which of the following process is not a step involved in water cycle operating in nature?
  • Photosynthesis
  • Evaporation
  • Rain fall
  • Nitrogen metabolism
What happen when rain falls on the soil which is devoid of vegetation cover?
  • Rainwater percolates into soil efficiently.
  • Rainwater causes loss of surface soil.
  • Rainwater leads to fertility of the soil.
  • Rainwater does not cause any changes in the soil.
Carbon dioxide is withdrawn from the carbon cycle in the forms of 
  • Organic matter
  • Carbonate rocks
  • Carbonate shells and skeletons in animals
  • Both B and C
An increase in carbon dioxide content in the atmosphere would not cause
  • More heat to be retained by the enviromnement
  • Increase in photosynthesis rate in plants
  • Global warming
  • Ozone layer depletion
The role of bacteria in carbon cycle is
  • Photosynthesis
  • Chemosynthesis
  • Decomposition of organic compounds
  • Evolution of $$O_2$$
The loss of water from the surface of a leaf in the form of water vapour is called __________.
  • Transpiration
  • Precipitation
  • Condensation
  • Evaporation
Which of the following is natural resource?
  • Tea
  • Cooked Food
  • Air
  • Coffee
The bacteria present in root nodules of leguminous plants, and can fix the atmospheric nitrogen is:
  • Rhizobium
  • Salmonella
  • Anthrax
  • Paramoecium
The function of bacteria present in the root nodules of leguminous plants is:
  • To store food
  • To perform photosynthesis
  • To fix the atmospheric nitrogen
  • To simplify the complex minerals present in the soil
Which of the following layer of the soil contains more humus?
  • Sandy
  • Top soil
  • Loamy soil
  • clayey soil
Which among the following is not a natural resource?
  • Air
  • Water
  • Drugs
  • Sunlight
Global warming could result in wide ranging effects on:
  • rainfall patterns
  • agriculture, forests
  • plants and animals
  • All of the above
Natural resources are gathered from which of the following?
  • Earth
  • Sea
  • Atmosphere
  • All of the above
Nitrogen cycle includes

(a) Nitrogen fixation (b) Ammonificiation (c) Nitrification (d) Denitrification
  • a, b, c, d
  • b, c, d
  • a, c, d
  • None of these
The microorganisms that play an important role in maintaining the balance of nitrogen gas in the atmosphere are ________.
  • Bacteria
  • Fungi
  • Virus
  • Protozoa
Carbon dioxide constitutes about 0.03% of the atmosphere
  • By volume
  • By weight
  • By mass
  • None of these
As we go on higher altitude, the oxygen level in the atmosphere:
  • Decreases
  • Increases
  • Remains same
  • Can't say
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