question_answer1)
What is the role of respiration in oxygen cycle?
question_answer2)
Name the gases which cause greenhouse effect.
question_answer5)
Which part of solar radiation is absorbed by ozone layer?
question_answer6)
What do you mean by biotic component?
question_answer7)
What do you mean by air pollution?
question_answer8)
Air is also called "breath of life'. Why?
question_answer9)
Which winds bring rain in most parts of India?
question_answer10)
State the harmful effects of ultraviolet rays.
question_answer11)
Which non-living component of the Earth determine
biodiversity of an area?
question_answer12)
State two factors, which are responsible for polluting
water.
question_answer13)
What is soil?
question_answer14)
What is top soil? How is it responsible for the
biodiversity in an area?
question_answer15)
What are the main substances of biogeochemical cycles?
question_answer16)
Which group of plants contains nitrogen fixing bacteria in
their roots?
question_answer17)
Name two organisms, which play vital role in nitrogen
fixation.
question_answer18)
Why step farming is common on hills?
question_answer20)
Write full form of CFCs.
question_answer21)
State one use of ozone.
question_answer22)
State the role of symbiotic bacteria in nitrogen cycle of
nature.
question_answer23)
Name any one method by which water helps in soil formation.
question_answer24)
In which region, the ozone layer is present in the
atmosphere?
question_answer25)
Where the hole in ozone layer have recently detected?
question_answer26)
Why the Earth is called as 'Blue Planet'?
question_answer27)
State the process by which carbon enters in the living
system.
question_answer28)
What is global warming?
question_answer29)
Name the component of air, which is most essential for
living organisms.
question_answer30)
Give two examples where water can be found in the frozen
form on the Earth.
question_answer31)
Why terrestrial life forms require freshwater?
question_answer32)
Name two fossil fuels, which are responsible for air
pollution.
question_answer33)
What do you mean by thermal pollution?
question_answer34)
Give any two effects of soil erosion.
question_answer35)
What is combustion?
question_answer36)
Name the process by which oxygen is replenished in nature.
question_answer37)
What is ozone hole?
question_answer38)
Name two freshwater resources, which provide freshwater
for human use.
question_answer39)
What is the direction of air in coastal areas during the
day?
question_answer41)
Name the two acids that are present in acid rain.
question_answer42)
Write the name of two greenhouse gases.
question_answer43)
What is the ultimate source of energy in an ecosystem?
question_answer45)
Tell the major component of atmosphere of Mars and Venus.
question_answer46)
Name some gases that cause air pollution.
question_answer47)
List two main ways by which oxygen is consumed and carbon
dioxide is produced.
question_answer48)
Give the composition of acid rain.
question_answer49)
Where is Rhizobium bacteria found?
question_answer50)
Which organisms carry out the process of denitrification?
question_answer51)
What is the oxygen content in Earth's atmosphere?
question_answer52)
What is nitrification?
question_answer53)
Which gas is most responsible for the global warming?
question_answer54)
What is the smog an indication of?
question_answer55)
What would happen if there were no atmosphere around the
Earth?
question_answer57)
Why should not the fertilisers and pesticides be used in
large amount?
question_answer59)
What is the reason behind the ozone layer getting depleted?
question_answer61)
What does top soil contain?
question_answer62)
What is the major source of minerals in soil?
question_answer63)
What is the percentage of Earth's surface covered by
water?
question_answer64)
How is oxygen returned to the atmosphere?
question_answer65)
Is photosynthesis involved in the water cycle somehow?
question_answer66)
Suggest some reasons to prevent soil erosion.
question_answer67)
What happens, when rain falls on soil without vegetation
cover?
question_answer68)
Tell one organism for which oxygen comes out to be
harmful.
question_answer69)
Which ray causes greenhouse effect?
question_answer70)
Give an example of any bacteria that converts nitrites
into nitrates.
question_answer71)
During photosynthesis where does the oxygen in the glucose
come from?
question_answer73)
Is air a biotic component or abiotic component?
question_answer75)
Draw a well labelled diagram to show carbon cycle in nature.
question_answer80)
Define the term natural resources. Write its two types
giving an example of each.
question_answer81)
State the role of plants in controlling flood and air
pollution.
question_answer82)
Enlist the sources of water pollution.
question_answer83)
Explain why smog formation occurs in cold weather.
question_answer84)
What is ozone hole? How it is caused?
question_answer85)
State the role of forests in maintaining water cycle.
question_answer86)
Write some harmful effects of air pollution.
question_answer87)
What is the role of decomposers in biogeochemical cycles?
question_answer93)
Why do people love to fly kites near the sea shore?
question_answer94)
River from land adds minerals to sea water.
Discuss how.
question_answer96)
Explain the role of the sun in the formation of Soil.
question_answer98)
State the role of nitrogen fixing bacteria in the
biosphere.
question_answer100)
Define humus and state its function in the soil.
question_answer101)
What is biogeochemical cycle? Write its main
substances.
question_answer102)
State the factors responsible for soil formation.
question_answer103)
Draw a well labelled diagram to show a oxygen cycle in
nature.
question_answer105)
Why nitrogen cycle is called perfect cycle in biosphere?
question_answer106)
State the role of nitrifying bacteria in nitrogen cycle.
question_answer108)
State the cause of acid rain.
question_answer109)
Fertile soil has lots of humus. Why?
question_answer110)
Mention one method by which living organisms influence the
soil formation.
question_answer111)
What do you mean by biological nitrogen fixation?
question_answer112)
Why is nitrogen fixing bacteria found only in roots of
leguminous plants?
question_answer118)
Draw well-labelled diagram to show nitrogen cycle in nature.
question_answer123)
Suggest any three preventive measures of reducing soil
erosion.
question_answer124)
What is ozone layer depletion? How it occurs? Where was it
firstly observed?
question_answer126)
"Soil is formed by water.' If you agree with this
statement, then give reasons.
question_answer127)
Carbon dioxide is necessary for plants.
Why do we consider it as a pollutant?
question_answer128)
Justify 'Dust is a pollutant.
question_answer132)
Describe biological water cycle.
question_answer133)
State the role of atmosphere in climate control.
question_answer143)
Name
two biologically important compounds that contain both oxygen and nitrogen.
question_answer144)
What
are renewable resources?
question_answer145)
What
are the two main causes of over-exploitation of natural resources?
question_answer146)
Name
the component of air that has maximum solubility in water.
question_answer147)
In
which zone of atmosphere is ozone layer present?
question_answer148)
Which
gas is added to the atmosphere by the decay of organic matter?
question_answer149)
Name
the two things essential for existence of life on Earth.
question_answer151)
What
are the two forms of elemental oxygen found in the atmosphere?
question_answer152)
Which
group of organisms is poisoned by elemental oxygen?
question_answer153)
What
is the effect of oxygen on nitrogen fixation?
question_answer154)
What
are the basic requirements for existence of life?
question_answer155)
How
is humus a major factor in deciding the soil structure?
question_answer156)
What
are the different states in which water is found during the water cycle?
question_answer157)
What
are clouds?
question_answer158)
Name
any one source of freshwater.
question_answer160)
From
where do we procure table salt?
question_answer161)
Give
any two uses of groundwater.
question_answer162)
What
is soil erosion?
question_answer163)
Why
step farming is common in hills?
question_answer165)
What
is topsoil?
question_answer166)
What
do you mean by fertility of the soil?
question_answer167)
What
are biodegradable pollutants?
question_answer169)
Which
group of plants has nitrogen-fixing bacteria in the root nodules?
question_answer170)
Name
the organism found in the root nodules of leguminous plants.
question_answer171)
What
are CFCs?
question_answer172)
The
atmosphere of the Earth is heated by which radiations?
question_answer174)
What
is 'ozone hole'?
question_answer175)
What
is the major source of mineral in soil?
question_answer176)
What
does marked temperature changes in aquatic environment mainly affect?
question_answer177)
How
is our atmosphere different from the atmosphere on Venus and Mars?
question_answer178)
How
does the atmosphere act as a blanket?
question_answer179)
What
causes winds?
question_answer180)
How
are clouds formed?
question_answer181)
List
any three human activities that you think would lead to air pollution.
question_answer182)
What
are the harmful effects of ozone?
question_answer183)
There
is mass mortality of fishes in a pond. What may be the reasons?
question_answer184)
Why
does life not exist on Venus and Mars while it exists on Earth?
question_answer185)
Write
the major uses of oxygen.
question_answer186)
Why
is carbon dioxide produced in large extents?
question_answer187)
How
is carbon dioxide fixed?
question_answer190)
Justify
"Dust is a pollutant".
question_answer191)
What
causes acid rain?
question_answer193)
What
is smog?
question_answer194)
Name
the major industrial air pollutants.
question_answer195)
How
is ozone layer useful to us?
question_answer196)
Why
is it said that nitrogen is very important for us?
question_answer197)
How
is a balance maintained in the environment?
question_answer198)
What
are the two main sources of air pollution?
question_answer199)
Why
is water essential for life?
question_answer200)
Write
the major uses of water.
question_answer201)
Name
the properties of potable drinking water.
question_answer202)
What
methods should be employed for conserving water resources?
question_answer203)
How
can the water released from dams affect the aquatic life?
question_answer205)
How
is the life of organisms living in water affected when water gets polluted?
question_answer208)
What
are aerosols?
question_answer209)
What
are the factors determining the soil type?
question_answer210)
Enlist
the main causes of soil erosion.
question_answer212)
How
can we prevent the loss of topsoil?
question_answer213)
What
makes the biosphere dynamic but stable system?
question_answer215)
Explain
the role of the Sun in the formation of soil.
question_answer217)
How
does burning of fossil fuels cause pollution?
question_answer218)
What
is the role of plants in controlling air pollution?
question_answer219)
What
would happen if the Sun heated the Earth's surface equally everywhere?
question_answer220)
What
is photochemical smog? And what are its effects?
question_answer221)
Describe
the major factors which lead to water pollution. Give examples.
question_answer222)
What
are the harmful effects of water pollution?
question_answer223)
What
do you mean by biological nitrogen fixation?
question_answer224)
Give
the names of a few organisms that help in nitrogen fixation.
question_answer227)
What
are the methods of preventing or reducing soil erosion?
question_answer229)
How
are CFCs harmful for the environment and living beings?
question_answer230)
What
is greenhouse effect?
question_answer231)
What
are the forms of oxygen found in the atmosphere?
question_answer232)
What
will be the consequence of global warming?
question_answer233)
Why
are oceans salty?
question_answer234)
Carbon
dioxide is necessary for plants. Why do we consider it as a pollutant?
question_answer235)
Rivers
from land add minerals to sea water. Discuss how?
question_answer237)
Why
is the circulation of carbon in nature important?
question_answer238)
Why
is atmosphere essential for life?
question_answer240)
What
is the importance of water for plant life?
question_answer241)
How
is carbon stored in our planet?
question_answer242)
How
is soil formed?
question_answer243)
What
are the sources of soil pollution?
question_answer244)
What
are the effects of soil pollution?
question_answer245)
How
can we control soil pollution?
question_answer246)
Describe
the water cycle.
question_answer247)
Describe
the steps and processes involved in the nitrogen cycle.
question_answer248)
Why
is replenishment of forests necessary?
question_answer249)
What
are the sources of oxygen in the atmosphere?
question_answer250)
Why
is it necessary to conserve natural resources? How can they be conserved?
question_answer251)
If
there is no atmosphere around the Earth, what will happen to its temperature?
question_answer260)
Why
do people love to fly kites near the seashore?
question_answer261)
Why
does Mathura refinery pose problems to the Taj Mahal?
question_answer263)
During
summer, if you go near the lake, you feel relief from the heat, why?
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(a)What will happen, if the step D does not occur?
(b) State two free living nitrogen fixing bacteria.
