In cities like Mumbai and Kolkata, the major air pollutants are ____.
In metro cities the major pollutants are the automobile exhaust in the form of oxides of sulphur and nitrogen
Air pollution is not caused by ____.
Air pollution is not caused by hydro-electric power plants.
Organisms which acquire energy and nutrients by digesting the organic molecules of living organisms are called ____.
Consumer feeds upon the organic substances. Lion, for instance, feeds on deer. Hence, lion is a consumer.
Acid rain contains ____.
Please select 2 correct answers
Acid rain is the mixture of HNO2, HNO3, H2SO3 and H2SO4
Water cycle is under the control of ____.
Water cycle is under the control of forests. Forests infiltrate water and are the main source to recharge underground water.
Non biological nitrogen fixation is ____ process.
Nitrogen is fixed during lightening when atmospheric nitrogen combines with oxygen to form nitrate and nitrites.
Earth remains protected from UV radiations due to the presence of ____.
Ozone layer prevents the entry of UV radiations on the earth.
In the cycle of energy and nutrient flow in the ecosystem, the nutrient flow ____.
In the cycle of energy and nutrient flow in the ecosystem, the nutrient flow is cyclic.
____ soil is the best suitable for plant growth.
Loamy soil is the best suitable for plant growth. Water storage capacity is high in loamy soil, so it is best suitable for plant growth.
A natural resource that has inherent capacity to replenish is called ____.
A natural resource that has inherent capacity to replenish is called renewable resource like biomass.
When a biotic component is disturbed in biogeochemical cycle, ____.
Mineral movement will be blocked if any biotic and abiotic component is disturbed in biogeochemical cycle. These nutrients keep on cycling from biotic to abiotic component and cycling is primarily carried out by decomposing microbes.
Ultraviolet light from the sun cause a reaction producing a gas which holds up the UV radiations in the atmosphere. The gas is ____.
Ultraviolet light reacts with atmospheric oxygen to form ozone which prevents the entry of UV radiations.
The atmosphere of large cities is polluted mostly by ____.
The atmosphere of large cities is polluted mostly by automobile exhaust.
Oil, coal and natural gas constitute ____.
Oil, coal and natural gas constitute fossil fuel.
The depletion of the ozone layer is responsible for all except ____.
Due to depletion of ozone layer, ultraviolet rays easily reach the earth surface. It is a mutagen and causes skin cancer and is also responsible for the depletion of the phytoplankton. Global warming is caused by increase in atmospheric carbon dioxide gas.
Which of the following is NOT the main source of carbon in the non living world?
The percentage of carbon dioxide in water is very less.
The main nitrogen reservoir in the biosphere is ____.
The main nitrogen reservoir in the biosphere is atmosphere. 78% of atmospheric gas is nitrogen.
Microbial conversion of ammonia to nitrate is termed as ____.
Microbial conversion of ammonia to nitrate is termed as Nitrification and is carried out by nitrifying bacteria like Nitrosomonas and Nitrobacter.
In the greenhouse effect, the increase in temperature is due to the ____.
Carbon dioxide is the main greenhouse gas and is responsible for the global warming.
Which of the following occurs among the biotic components in an ecosystem?
Flow of energy and cycling of the materials are major attributes of the biotic component of the ecosystems.
Water cycle is made up of two overlapping cycles. They are ____.
Water cycle is made up of two overlapping cycles. They are ground H2O and atmospheric H2O cycle. Ground water consists of aquatic systems that overlap with atmospheric water vapour.
Forests are ____.
Forests are exhaustible and maintainable.
World environment day is celebrated on ____.
16th September is observed as Ozone Day.
The main role of bacteria in the carbon cycle involves ____.
The role of bacteria in carbon cycle is a decomposer. Organic compounds are broken into simpler forms.
Study of biogeochemical cycles involves cycling of ____.
Biogeochemical cycle primarily involves the cycling of the nutrients from the abiotic to biotic components and it runs in cyclic manner.
Volcanic eruption disturbs ____.
Volcanic eruption results in release of carbon dioxide that disturbs carbon cycle.
The impact of pollution is greatest on the ____.
Pollution is undesirable changes in the physical environment. Hence, pollution at any place disturbs the ecological balance.
Oxygen is found in the ____ form in nature.
Oxygen is found in the molecular form in nature.
Maximum oxygen comes from ____.
Phytoplankton constitute maximum global biomass and productivity. Hence, they are the greatest contributor of the atmospheric oxygen through photosynthetic activities.
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