Science - Natural resources
Exam Duration: 45 Mins Total Questions : 30
The diagram given below shows a part of the nitrogen cycle
Which of the labelled arrows indicates nitrogen fixation and denitrification?
- (a)
Nitrogen fixation Denitrification P Q - (b)
Nitrogen fixation Denitrification R S - (c)
Nitrogen fixation Denitrification Q P - (d)
Nitrogen fixation Denitrification R Q
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
What kind of pollution is being caused if a factory releases waste products into a nearby stream?
- (a)
Air
- (b)
Noise
- (c)
Water
- (d)
Soil
which of these statements are true about air?
(i) Air is a mixture of several types of gases.
(ii) Air exerts pressure.
(iii) The composition of air is constant in the atmosphere.
- (a)
(i) and (ii)
- (b)
(ii) and (iii)
- (c)
(ii) and (iii)
- (d)
(i), (ii) and (iii)
Which of the following natural processes play(s) a role in the nitrogen cycle?
(i) lightning (ii) Flood (iii) Storm
- (a)
Lightning
- (b)
Flood
- (c)
Storm
- (d)
All of these
The water cycle in nature involves which of the following processes sequentially?
- (a)
Evaporation, precipitation and condensation.
- (b)
Precipitation, condensation and evaporation.
- (c)
Evaporation, condensation and precipitation.
- (d)
Condensation, evaporation and precipitation .
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
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
Identify T in the given water cycle.
- (a)
Melting
- (b)
Condensation
- (c)
Evaporation
- (d)
Precipitation
Signs of eutrophication of water bodies include.
- (a)
reduced oxygen demand
- (b)
rapid decomposition of organic matter.
- (c)
algal bloom
- (d)
fluorosis
Which of the following is renewable natural resource?
- (a)
Sunlight
- (b)
Coal
- (c)
Soil
- (d)
Petroleum
Which of the following are the ways of conserving and preserving the earth's natural resources?
- (a)
Recycling wastes
- (b)
Using alternative energy sources
- (c)
Reducing the wastage of non renewable natural resources
- (d)
All of these
Which of the following natural disasters affect habitat in the environment?
- (a)
Droughts
- (b)
Floods
- (c)
The thinning of the ozone layer
- (d)
All of these
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
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
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)
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.
Which of the following chemicals cause the thinning of layer P?
- (a)
Carbon monoxide
- (b)
Sulphur dioxide
- (c)
Chlorofluorocarbons
- (d)
Both (A) and (C)
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
Which of the following activities increase the concentration of carbon dioxide in the atmosphere?
(i) Deforestation
(ii) Combustion of fuel
(iii) Over hunting
- (a)
Deforestation
- (b)
Combustion of fuel
- (c)
Over hunting
- (d)
Both (A) and (B)
Which of the following processes represents X?
River➡️ x ➡️ Clouds
- (a)
Respiration
- (b)
Transpiration
- (c)
Combustion
- (d)
Evaporation
Which of the following gases cause acid rain?
- (a)
Carbon monoxide and carbon dioxide.
- (b)
Sulphur dioxide and oxides of nitrogen.
- (c)
Oxides of nitrogen and carbon dioxide.
- (d)
None of these.
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
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
Which of the human activity has added the largest amounts of carbon to the atmosphere?
- (a)
Burning fossil fuels
- (b)
Mining fossil fuels
- (c)
Increasing soil erosion
- (d)
Increasing food consumption
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)
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
Which of the following gases is regarded as an atmospheric pollutant?
- (a)
O2
- (b)
O3
- (c)
SO2
- (d)
N2
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.
Which of the following is the largest reservoir of carbon?
- (a)
Soil
- (b)
Atmosphere
- (c)
Ocean
- (d)
Sedimentary rocks