Olympiad Science - Natural resources
Exam Duration: 45 Mins Total Questions : 30
What is fare the likely consequences of deforestation?
- (a)
Carbon dioxide in the air increases.
- (b)
Destruction of habitats takes place.
- (c)
Mineral salts in the soil are washed away.
- (d)
All of the above
Logging for timber/deforestation causes soil erosion, increasing of CO2 in air, global warming, flash floods and destruction of plants and animals.
Identify the given biogeo chemical cycle.
- (a)
Mineral cycle
- (b)
Nitrogen cycle
- (c)
Water cycle
- (d)
Oxygen cycle
The given figure represents oxygen cycle.
What causes movement in air?
- (a)
Difference in temperature
- (b)
Difference in pressure
- (c)
Difference in volume
- (d)
Both (A) and (B)
Differences in temperature and pressure causes air movement
What is the role of the bacteria in Root nodules of legumes
- (a)
To convert oxides of nitrogen into soil nitrates.
- (b)
To convert atmospheric nitrogen gas into soil nitrates.
- (c)
To convert soil nitrates into gaseous nitrogen.
- (d)
To convert plant proteins into ammonia
Bacteria having symbiotic association with plants, fix 60% of nitrogen gas into soil nitrates.
Which of these statements is/are true about the given sample of air?
Nitrogen Oxygen Carbon dioxide
78.0% 16.4% 4.4%
- (a)
Dissolved air from pond water
- (b)
Fresh air from a field
- (c)
Exhaled air
- (d)
Polluted air near a factory
The percentage of oxygen and carbon dioxide in inhaled air is 21% and 0.04% respectively. During respiration, oxygen is used up by the cells producing carbon dioxide.
Identify T in the given water cycle.
- (a)
Melting
- (b)
Condensation
- (c)
Evaporation
- (d)
Precipitation
The process T represents condensation. When water vapour loses heat, it condenses to form water droplets.
Which of the following is renewable natural resource?
- (a)
Sunlight
- (b)
Coal
- (c)
Soil
- (d)
Petroleum
Sunlight is an inexhaustible renewable natural resource
Which of the following are negative effects on the environment from the excessive use of fertilisers in a farm situated near a lake?
- (a)
Decreased oxygen content in the water
- (b)
Decreased light penetration in the water
- (c)
Decreased population of aquatic organisms
- (d)
All of these
Eutrophication occurs. The algae use up the oxygen present in water, causing the death of fish and other aquatic organisms.
Identify P in the given carbon cycle.
- (a)
Carbon compounds in animals
- (b)
Carbon compounds in plants
- (c)
Carbon dioxide in the air
- (d)
Coal and oil
'P' represents carbon dioxide in the air. It is a source of carbon in the atmosphere and is maintained at 0.03%.
Identify the labelled parts P and R in the given cycle:
- (a)
P R Photosynthesis Nitrogen - (b)
P R Respiration Combustion - (c)
P R Excretion Oxygen - (d)
P R Photosynthesis Carbon dioxide
'P' is photosynthesis and 'R' is carbondioxide.
Which of the following cause green house effect?
(i) Deforestation
(ii) Emission of gases from factories
(iii) Melting of polar ice
- (a)
Only (i) and (ii)
- (b)
Only (i) and (iii)
- (c)
Only (ii) and (iii)
- (d)
(i), (ii) and (iii)
Deforestation and greenhouse gases like carbon dioxide and CH. that are released into the air from factories cause green house effect.
Which of the following processes involves the escaping of nitrogen into air from decaying matter?
- (a)
Nitrification
- (b)
Denitrification
- (c)
Nitrogen fixation
- (d)
Nitrogen assimilation
Release of nitrogen into the air by the action of bacteria on decaying matter is called denitrification.
Which of the following are the adverse effects of deforestation?
- (a)
Reduced rainfall
- (b)
Soil erosion
- (c)
Destruction of habitat
- (d)
All of these
Deforestation leads to reduced rainfall, soil erosion, destruction of habitat and climatic changes
Which of the following processes represents P, Q and R?
- (a)
P-Respiration, Q-Photosynthesis, R-Combustion.
- (b)
P-Respiration, Q-Combustion, R-Photosynthesis.
- (c)
P-Combustion, Q-Decay, R-Respiration.
- (d)
P-Decay , Q-Respiration , R-Photosynthesis.
In the given figure arrow labelled 'R' represents photosynthesis, 'P' represents respiration and 'Q' represents combustion.
Which of the following chemicals cause the thinning of layer P?
- (a)
Carbon monoxide
- (b)
Sulphur dioxide
- (c)
Chlorofluorocarbons
- (d)
Both (A) and (C)
Carbon monooxide and CFC'S are greenhouse gases that cause the thinning of layer P.
Which of the following processes labelled with arrows are brought about by bacteria?
- (a)
P and Q
- (b)
Q and R
- (c)
R and S
- (d)
S and P
The option 'R' represents decomposition by micro-organisms and '5'. represents nitrogen fixation.
Which of the following is/are caused due to deforestation?
- (a)
Soil erosion
- (b)
Depletion of water in the catchment areas
- (c)
Global warming
- (d)
All of these
Soil erosion, depletion of water in catchment area, Global warming are caused due to deforestation.
Which of the following statements is true about the process shown below?
Food + oxygen ➡️ carbon dioxide + water + energy
- (a)
It is caused by the decay of organic substances.
- (b)
It is an important process in the nitrogen cycle.
- (c)
It is carried out by green plants and certain bacteria.
- (d)
It is an essential process in living organisms to provide energy and in maintaining the balance between oxygen and carbon dioxide in the atmosphere.
The given process is an essential process in maintaining the balance between oxygen and carbon dioxide in the atmosphere.
Which of the following processes represents X?
River➡️ x ➡️ Clouds
- (a)
Respiration
- (b)
Transpiration
- (c)
Combustion
- (d)
Evaporation
In the given figure, X is evaporation
Which of the following will not cause an environmental pollution?
- (a)
Noise from vehicles
- (b)
The Using of chemical fertilisers
- (c)
Improper disposal of sewage
- (d)
The Using of a CFC free refrigerator
The usage of CFC free refrigerator will not cause environmental pollution.
Which of the following are essential for the maintenance of balance in the ecosystem?
- (a)
Water cycle
- (b)
Carbon cycle
- (c)
Nitrogen cycle
- (d)
All of these
Water cycle, Carbon cycle, and Nitrogen cycle are essential to maintain balance in an ecosystem.
Which of the following processes provides most of the oxygen found in the earth's atmosphere?
- (a)
Photosynthesis
- (b)
Aerobic respiration
- (c)
Excretion
- (d)
Fermentation
Photosynthesis provides most of the oxygen found in the earth's atmosphere.
Which of the following are caused due to the unplanned clearing of land?
(i) The destruction of habitats
(ii) Soil erosion
(iii) landslides
(iv) Global warming
- (a)
Only (i), (ii) and (iii)
- (b)
Only (l), (ii) and (iv)
- (c)
Only (i), (iii) and (iv)
- (d)
(i), (ii), (iii) and (iv)
The destruction of habitats, soil erosion and global warming are due to unplanned clearing of land.
The figure given below shows part of the carbon cycle.
K, L and M are processes that take place in the carbon cycle. Which of the following combinations represents K, L and M correctly?
- (a)
K L M Combustion Respiration Photosynthesis - (b)
K L M Respiration Decomposition Photosynthesis - (c)
K L M Decomposition Respiration Decomposition - (d)
K L M Combustion Decomposition Respiration
In the given carbon cycle K-represents combustion, L-represents decomposition and M-represents respiration.
Which of the following materials of biological origin are commonly used to maintain and improve soil fertility?
- (a)
Green manure
- (b)
Biofertilisers
- (c)
Bioinsecticides
- (d)
Both (A) and (B)
Green manure and biofertilisers maintain and improve soil fertility.
Which of the following plays a major role in replacing oxygen in the atmosphere?
- (a)
Green plants
- (b)
The weathering of rocks
- (c)
Fossil-fuel combustion
- (d)
All of the above
Green plants replace oxygen in the atmosphere, through a process called photosynthesis.
How do animals get their nitrogen?
- (a)
By absorbing nitrogen gas through the skin.
- (b)
By eating carbohydrates like sugars and starch.
- (c)
From nitrates in their drinking water.
- (d)
By eating plants and other animals.
Animals get their nitrogen when they consume plants and animals.
Which of the following gases is/are produced by decomposers during the decaying process?
- (a)
Only carbon dioxide gas
- (b)
Only carbon dioxide and nitrogen gases
- (c)
Only oxygen gas
- (d)
Only carbon dioxide and oxygen gases
Decomposers produce nitrogen and carbon dioxide gases.
Which of the following reduce(s) air pollution?
(i) Using an incinerator
(ii) Using renewable energy
(iii) Fixing catalytic converters in vehicles.
- (a)
Only (i)
- (b)
(ii) and (iii)
- (c)
(i) and (iii)
- (d)
(i), (ii) and (iii)
Using an incinerator to burn garbage using renewable energy like solar and wind energy and fixing catalytic converters reduce air pollution.
Which of the following is the largest reservoir of carbon?
- (a)
Soil
- (b)
Atmosphere
- (c)
Ocean
- (d)
Sedimentary rocks
Oceans are the largest sinks of carbon.