About half of the rain which falls in tropical forests comes from
1.High winds
2.Cold surroundings
3.Transpiration of plants
4.Surrounding seas
Posted Date:-2021-09-02 03:48:04
Acid rain is caused by
1.Sulphur dioxide
2.Oxides of nitrogen
3.Both a and b
4.None of these
Posted Date:-2021-09-02 03:48:04
Algal bloom is also called as
1.Deforestation
2.Eutrophication
3.Neotrophication
4.Lichen
Posted Date:-2021-09-02 03:48:04
Balance in the nutrient cycle can be upset when
1.Too much food is consumed
2.Not enough food is produced
3.Decayed nutrients are not returned to the ground
4.All of these
Posted Date:-2021-09-02 03:48:04
Biodiversity is
1.Total number of species in a community
2.Total number of species in an ecosystem
3.Total number of genus in an ecosystem
4.None of these
Posted Date:-2021-09-02 03:48:04
Carbon atom is
1.Monovalent
2.Divalent
3.Trivalent
4.Tetravalent
Posted Date:-2021-09-02 03:48:04
Causes of green house effect are
1.Over urbanization
2.Deforestation
3.Industrialization
4.All of these
Posted Date:-2021-09-02 03:48:04
Detergents usually release
1.Carbonates
2.Sulphates
3.Phosphates
4.Nitrates
Posted Date:-2021-09-02 03:48:04
Diphtheria is
1.Genetic disease
2.Pathogenic disease
3.Metabolic disease
4.Nutritional disease
Posted Date:-2021-09-02 03:48:04
Diseases caused by UV rays in humans
1.Skin cancers
2.Cataracts
3.Night blindness
4.Both a and b
Posted Date:-2021-09-02 03:48:04
Driving force for all the cycles in ecosystem is
1.Water
2.Soil
3.Sun
4.Air
Posted Date:-2021-09-02 03:48:04
Endangered species are
1.Dangerous for the life of humans
2.Reduced in number
3.Already extinct
4.All of these
Posted Date:-2021-09-02 03:48:04
Establishment of new forests where no forests existed previously is called
1.Reforestation
2.Forestation
3.Neofrestation
4.Aforestation
Posted Date:-2021-09-02 03:48:04
Geothermal energy is
1.Energy obtained from nuclear fuel
2.Energy obtained from burning natural fuels
3.Heat energy trapped underground
4.Energy obtained from blowing hot winds
Posted Date:-2021-09-02 03:48:04
Hot substance is escaped from inside the earth in the form of
1.Volcanoes
2.Hot springs
3.Geysers
4.All of these
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Hydroelectricity is generated by using ______ of falling water.
1.Potential energy
2.Gravitational energy
3.Kinetic energy
4.All of these
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In 1947 population of Pakistan was
1.32.5 million
2.35.5 million
3.40.5 million
4.45.5 million
Posted Date:-2021-09-02 03:48:04
In air % of oxygen and carbon dioxide is
1.Oxygen 20%, CO2 0.03%
2.Oxygen 50%, CO2 50%
3.Oxygen 30%, CO2 0.05%
4.Oxygen 25%, CO2 0.02%
Posted Date:-2021-09-02 03:48:04
In air nitrogen is
1.57%
2.20%
3.79%
4.30%
Posted Date:-2021-09-02 03:48:04
In oceans of tropical regions
1.Temperature of surface water is 40?C and 10?C at depth
2.Temp of surface water is 25?C and 5?C at depth
3.Surface water 50?C and depth 20?C
4.Surface water 10?C and depth 15?C
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Incomplete burning of carbon compounds cause release of
1.Carbon dioxide
2.Carbon monoxide
3.Oxides of nitrogen
4.CFCs
Posted Date:-2021-09-02 03:48:04
Ozone depletion is commonly caused by
1.CFCs
2.Industrial smoke
3.Heavy nitrogen gasses
4.Carbon dioxide
Posted Date:-2021-09-02 03:48:04
Pesticides and fertilizers are also called
1.Pestochemicals
2.Industrochemicals
3.Killing chemicals
4.Agrochemicals
Posted Date:-2021-09-02 03:48:04
Process that supplies food to living things through decaying and decomposition is called
1.Food cycle
2.Nutrient cycle
3.Dead-live cycle
4.None of these
Posted Date:-2021-09-02 03:48:04
Rate of population growth in 1980s was
1.10%
2.1%
3.2%
4.15%
Posted Date:-2021-09-02 03:48:04
Reactions in which simple substances are combined to form complex substances are called:
1.Metabolic reactions
2.Catabolic reactions
3.Anabolic reactions
4.None of these
Posted Date:-2021-09-02 03:48:04
Replantation of plants in the areas where they were present earlier is called
1.Deforestation
2.Aforestation
3.Forestation
4.Reforestation
Posted Date:-2021-09-02 03:48:04
Study of human population and things that affect them is
1.Ecology
2.Demography
3.Demology
4.Environment study
Posted Date:-2021-09-02 03:48:04
The bond formed when two or more atoms complete their electron shells by sharing electrons is called:
1.Ionic bond
2.Hydrogen bond
3.Covalent bond
4.Electrovalent bond
Posted Date:-2021-09-02 03:48:04
The branch of biology which deals with the study of chemical compounds and the chemical processes in the fliving organisms is called:
1.Chemistry
2.Biochemistry
3.Molocular biology
4.Both a and b
Posted Date:-2021-09-02 03:48:04
The chemical wastes from industry is called
1.Industrial litter
2.Industrial trash
3.Industrial effluents
4.Industrial deffluents
Posted Date:-2021-09-02 03:48:04
Tides are caused by
1.Gravitational pull of sun
2.Movements of large animals in water
3.Uneven water body floor
4.High winds
Posted Date:-2021-09-02 03:48:04
Total area of the world under cultivation is
1.5%
2.11%
3.21%
4.31%
Posted Date:-2021-09-02 03:48:04
Water constitutes --% of body weight?
1.25-30%
2.70-90%
3.10-30%
4.30-50%
Posted Date:-2021-09-02 03:48:04
Which are more susceptible to attacks of pests?
1.Multicultures
2.Monocultures
3.Dicultures
4.Polycultures
Posted Date:-2021-09-02 03:48:04
Which chemical component has the greatest contribution in the total mammalian cell weight?
1.Proteins
2.Carbohydrate
3.Lipids
4.Water
Posted Date:-2021-09-02 03:48:04
Which chemical component has the same % in bacterial as well as the mammalian cell?
1.Water
2.Carbohydrate
3.Proteins
4.Lipids
Posted Date:-2021-09-02 03:48:04
Which disease does not match its etiology?
1.Kwashiorkor is a nutritional deficiency
2.Alzheimer is a mental illness
3.Cretinism is due to hormonal imbalance
4.Cholera is physical disorder
Posted Date:-2021-09-02 03:48:04
Which gas commonly causes green house effect?
1.Hydrogen sulphide
2.Carbon dioxide
3.Nitrogen gas
4.Carbon monoxide
Posted Date:-2021-09-02 03:48:04
Which is environmental buffer?
1.Mountains
2.Deserts
3.Forests
4.Oceans
Posted Date:-2021-09-02 03:48:04
Which one is an organic compound?
1.CO2
2.Water
3.Lipids
4.HCI
Posted Date:-2021-09-02 03:48:04
Which one is the basic element of organic compounds ?
1.Oxygen
2.Hydrogen
3.Sulphur
4.Carbon
Posted Date:-2021-09-02 03:48:04
Which one the following is not nutritional disease?
1.Scurvy
2.Anemia
3.Goiter
4.Diabetes
Posted Date:-2021-09-02 03:48:04
Which sequence is correct?
1.Dead plants?lignite?peat?coal
2.Dead plants?peat?lignite?coal
3.Dead plants?coal?lignite?ash
4.Dead animals?peat?lignite?coal
Posted Date:-2021-09-02 03:48:04
Which statement is not true about ozone?
1.Bluish
2.Explosive
3.10-50 km
4.O2
Posted Date:-2021-09-02 03:48:04
Which statement is true?
1.20% of total water is in the form of frozen ice caps
2.80% is in oceans
3.1% as fresh water lakes, streams and rivers
4.10% is in canals
Posted Date:-2021-09-02 03:48:04
Wild life refers to
1.All plants of the world
2.All non cultivated plants
3.Non domesticated animals
4.Both b and c
Posted Date:-2021-09-02 03:48:04
Wind blows from area of
1.Low pressure to high pressure
2.High pressure to low pressure
3.Moderate pressure to high pressure
4.Low pressure to low pressure
Posted Date:-2021-09-02 03:48:04
______% of our energy requirements are met from fossil fuels
1.50
2.55
3.90
4.95
Posted Date:-2021-09-02 03:48:04