CBSE Questions for Class 9 Biology Natural Resources Quiz 10 - MCQExams.com

Which of the following chemicals is/are depleting ozone layer?
  • CFC's and compounds of chlorine fume or halogen gas
  • Carbon dioxide and carbon monoxide
  • Hydrofluorocarbons
  • Both A and C
The pollutant emitted by paddy fields is _________.
  • $$CO_2$$
  • $$CH_4$$
  • $$CO$$
  • $$H_2O_2$$
Which one is not dangerous?
  • Bio-pollutants
  • Ozone layer
  • Nuclear blast
  • Deforestation
The best solution to combat greenhouse effect is
  • To use diesel vehicles
  • To stop infra-red from entering the earth
  • Afforestation and grow abundant plants
  • All of the above
Refer the given biogeochemical cycle and select the correct option regarding it.
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  • Z is carbon dioxide, X is photosynthesis and W is acid rain.
  • Z is nitrogen, Y is combustion and W is acid rain.
  • Z is carbon dioxide by respiration, X is photosynthesis and W is global warming.
  • Z is nitrogen, X is oxygen.
Choose the incorrect statement among the following.
  • Natural gas is used as a starting material for the manufacture of a number of chemicals and fertilizers.
  • Over millions of years, the presence of air, high temperature, and low pressure transformed the dead organisms into petroleum.
  • The air, the water and the soil form the non-living or abiotic component of the biosphere.
  • Minerals, coal, petroleum, natural gas, etc. are exhaustible natural resources.
Distilled water is commonly used across manufacturing and within industry when the highest quality of water is required.
  • True
  • False
Escherichia coli is used as an indicator organism to determine pollution of water with:
  • Heavy metals
  • Fecal matter
  • Industrial effluents
  • Pollen of aquatic plants
The soil near the surface is usually darker than about one meter down, this is because the top soil:
  • Is richer in calcium and magnesium
  • Contains more organic matter
  • Is wetter than the sub-soil
  • Is drier than the sub-soil
Of more immediate concern regarding carbon cycle is
  • Output rate of carbon locked in deposits of coal, petroleum and natural gas
  • Greenhouse gases
  • Increase in the total mass of carbon in Earth's atmosphere 
  • All of the above
World climate is threatened by an increase in the atmospheric concentration of _________.
  • Oxygen
  • Nitrogen
  • Water vapours
  • Carbon dioxide
  • Both C and D
The principle green house gases are ____________.
  • Methane
  • Carbon dioxide
  • Chlorofluorocarbon
  • All of these
Arrange the following in the descending order of their role in soil erosion
(I) Wind erosion
(ii) Chemical degradation
(iii) Physical degradation
(iv) Water erosion
  • iv $$\rightarrow$$ i $$\to$$ ii $$\to$$ iii
  • iv $$\to$$ ii $$\to$$ iii $$\to$$ i
  • i $$\to$$ ii $$\to$$ iii $$\to$$ iv
  • iv $$\to$$ iii $$\to$$ ii $$\to$$ i
To prevent soil erosion, a farmer plants a hedge across a field. This method works because
  • The hedge prevents the soil from direct impact of rainwater.
  • The roots of plants prevent the soil erosion.
  • The hedge absorbs minerals from the soil, which makes it most compact.
  • None of the above.
A lake with an inflow of domestic sewage rich in organic waste may result in
  • An increased production of fishes due to lot of nutrients
  • Death of fishes due to lack of oxygen
  • Drying of the lake very soon due to algal bloom
  • Increased population of aquatic food web organisms
Observe the nitrogen cycle given and answer the following question. What is the conversion of ammonia into nitrates called?

449610_fde39b3c5eac4a9fa3d40f681d50fdc0.jpg
  • Nitrification
  • Ammonification
  • Dentrification
  • Nitrogen fixation
In carbon cycle, the process responsible for bringing carbon into its living part is
  • Photosynthesis
  • Cellular respiration
  • Combustion
  • Decomposition
  • Fixation
Soil erosion by wind brings about a serious damage in soil by changing the__________.
  • Soil permeability
  • Soil structure
  • Soil texture
  • Soil plasticity
State which of the following statements is correct and incorrect?
(A) Decomposition of the organic nitrogen of dead plants and animals to ammonia is called ammonification.
(B) Some of this ammonia is converted into nitrate by soil bacteria and the rest all volatilises and returns to the atmosphere.
  • Both A and B are correct.
  • A is correct and B is incorrect.
  • A is incorrect and B is correct.
  • Both A and B are incorrect.
Aerosols having carbon and fluorine compounds are chiefly released by _______.
  • Refineries
  • Automobiles
  • Industries
  • Jets
Consider the following statements and select the option which correctly identifies true (T) and false (F) ones.
(i) North-East India receives very little rain throughout the year, so we can say that climate in North-East India is hot and dry.
(ii) Thick layer of subcutaneous fat, thick skin and a dense feather cover in polar birds like penguins protect them from severe cold weather.
(iii) Polar animals need to conserve water due to water scarcity.
(iv) As we move higher up from sea level, temperature decreases.
  • (i)F (ii)F (iii)T (iv)T
  • (i)F (ii)T (iii)F (iv)T
  • (i)F (ii)F (iii)T (iv)F
  • (i)T (ii)T (iii)F (iv)T
A simplified model of the carbon cycle is depicted.
X, Y and Z in the figure could represent.

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  • X: rice plants, Y: locusts and Z: bacteria
  • X: goats, Y: grass and Z: fungi
  • X: saprophytic bacteria, Y: horses and Z: shrubs
  • X: cows, Y: saprophytic fungi and Z: bacteria
The effect of ozone depletion include 
  •  Increased UV radiation levels at the Earth's surface
  • Increases in certain types of skin cancers
  •  Increase in cases of eye cataracts
  • All the above
Complete break down of complex organic matter in soil into minerals is?
  • Pedogenesis
  • Humification
  • Mineralization
  • Stratification
Rajasthan has much lesser biodiversity when compared to the Himalayas. Why?
  • High level of pollution
  • Scarcity of water
  • Urbanization
  • None of these
Which of the following statement is true about ozone layer ?
  • The ozone layer is the common term for the high concentration of ozone that is found in the troposphere.
  • It is beneficial because oxidation reaction can proceed faster in the presence of ozone.
  • It is beneficial because it blocks the ultraviolet radiation of the sun.
  • It is harmful because ozone is dangerous to living organisms.
Water is the only factor that decides the diversity of life in an area.
Is the above statement true or false?
  • True
  • False
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