Multiple Choice Questions
Our Environment
Practice Questions with Answers
Total 126 questions available
Q. 1
Which agricultural activites are affecting the
environment?
A
Overuse of fertlisers and pesticidesB
All of the aboveC
Using groundwater for irrigationD
Extensive cropping in the same area of landClick an option to check your answer
Q. 2
In an ecosystem, the 10% of energy available for transfer from one trophic level to next is in the form of ____.
A
zooplanktonB
mechanical energyC
chemical energyD
light energyClick an option to check your answer
Q. 3
What type of support did Aditya and Amit receive for starting Amrit Fertilizers?
A
Financial support from the governmentB
Technical support from the governmentC
Both financial and technical support from the governmentD
No government supportClick an option to check your answer
Q. 4
Lakes and ponds do not require cleaning but an
aquarium does because
A
lakes do not possess any decomposers and thus BOD always remains low.B
an aquarium possesses a pool of decomposers.C
lakes and ponds are natural and complete ecosystems.D
an aquarium is an artificial and a complete ecosystem.Click an option to check your answer
Q. 5
The maximum number of levels in a food chain can
be:
A
1-3B
7-8C
5-6D
3-4Click an option to check your answer
Q. 6
Why are decomposers not typically included in the food chain?
A
They act at every trophic level of the food chain.B
They do not break down organic compounds.C
They convert organic material to inorganic forms.D
They release enzymes outside their body to convert organic material to inorganic forms.Click an option to check your answer
Q. 7
Which of the following is not a non-biodegradable material ?
A
jute carry bagB
nylon socksC
skin cancerD
peptic ulcersClick an option to check your answer
Q. 8
The % of solar radiation absorbed by all green plants for photosynthesis is about ———–.
A
2%B
7%C
1%D
8%Click an option to check your answer
Q. 9
If 10,000 joules of solar energy are absorbed by green plants in a terrestrial ecosystem, what percentage of this energy is typically converted into food energy?
A
10,000 joulesB
100 joulesC
1000 joulesD
It depends on the type of terrestrial plant.Click an option to check your answer
Q. 10
Several factories were pouring their wastes in rivers
A and B. Water samples were collected from these
two rivers. It was observed that sample collected
from river A was acidic while that of river B was
basic. The factories located near A and B are:
A
Soaps and detergents factories near A and alcohol distillery near B.B
Soaps and detergents factories near B and alcohol distillery near A.C
Lead storage battery manufacturing factories near A and soaps and detergents factories near B.D
Lead storage battery manufacturing factories near B and soaps and detergents factories near A.Click an option to check your answer
Q. 11
What do Aditya Aggarwal and his brother Amit Aggarwal run in addition to Tee Cee Industries?
A
A steel plantB
A cow shelterC
A biogas projectD
All of the aboveClick an option to check your answer
Q. 12
Select the odd one out.
A
Synthetic polymersB
Lime juiceC
WoodD
Tomato leavesClick an option to check your answer
Q. 13
In a grazing food chain, primary consumers (herbivores) represent
A
T8 levelB
T9 levelC
T1 levelD
T2 levelClick an option to check your answer
Q. 14
_____ is not an abiotic factor.
A
AnimalsB
AltitudeC
HumidityD
TemperatureClick an option to check your answer
Q. 15
If Mr. X is consuming curd/yogurt in a food chain, at which trophic level should he be placed?
A
First trophic levelB
Second trophic levelC
Fourth trophic levelD
Third trophic levelClick an option to check your answer
Q. 16
In an ecosystem, the 10% of energy available for
transfer from one trophic level to the next is in the
form of:
A
mechanical energyB
chemical energyC
light energyD
heat energyClick an option to check your answer
Q. 17
Disposable plastic plates should not be used
because :
A
they are made of toxic materials.B
they are made of materials with light weightC
they are made of non-biodegradable materials.D
they are made of biodegradable materials.Click an option to check your answer
Q. 18
Accumulation of non-biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as :
A
wood, paper, leatherB
biomagnificationC
accumulationD
plastic, detergent, glassClick an option to check your answer
Q. 19
Why is sunlight important for most life on Earth?
A
It makes the weather nice.B
It provides energy for animals to play.C
It helps plants grow.D
It helps animals find food.Click an option to check your answer
Q. 20
Organisms of a higher trophic level which feed on
several types of organisms belonging to a lower
tropic level constitute the
A
food webB
ecological pyramidC
ecosystemD
food chainClick an option to check your answer
Q. 21
Which of these is NOT a correct sequence of a
food chain?
A
Phytoplanktons → Zooplanktons → FishB
Grass → Insects → Frog → SnakeC
Seed grains → Rodents →→ EagleD
Seaweed → Zooplanktons →→PhytoplanktonsClick an option to check your answer
Q. 22
Which of the following sets represents the
substances required for the formation of ozone?
A
Oxygen and UV radiationsB
Oxygen and IR radiationsC
Carbon dioxide, water vapour and UV radiationsD
Oxygen and radiations of longer wavelengthsClick an option to check your answer
Q. 23
Depletion of ozone is mainly due to ________
A
Putrefying bacteriaB
CyanobacteriaC
chlorofluorocarbonsD
sulphur dioxideClick an option to check your answer
Q. 24
The organisms of higher trophic level which feed on several types of organisms belonging to lower trophic level, constitute the—————–.
A
decomposersB
herbivoresC
ecological pyramidD
food webClick an option to check your answer
Q. 25
In a food chain, the initial organism is usually :
A
herbivoreB
fruit peels, cake and lime juiceC
photosyntheticD
cake, wood, grassClick an option to check your answer
Q. 26
The UV radiation from the sun is likely to cause _____________ in human.
A
Brain CancerB
Liver CancerC
Skin cancerD
Lung cancerClick an option to check your answer
Q. 27
In an ecosystem, there is a flow of
A
chemical energyB
energy onlyC
energy and nutrientsD
nutrients onlyClick an option to check your answer
Q. 28
Which of the following pairs belong to the same trophic level?
A
Rabbit: TigerB
Vulture: CrowC
Deer: HawkD
Frog: LizardClick an option to check your answer
Q. 29
Which of the following are environment friendly
practices ?
A
Walking to school instead of getting your mother to drop you on her scooter.B
Carrying cloth bags to put purchases in while shopping.C
All of the aboveD
Switching off unnecessary lights and fans.Click an option to check your answer
Q. 30
In an ecosystem, the matter is recyclable because
of
A
the sun, which is an ultimate source of energyB
decomposition activity of decomposersC
the fact that matter is made up ofatomsD
None of theseClick an option to check your answer
Q. 31
Fish diet can play significant role in biological
magnification of pesticides like DDT because:
A
fishes can also produce these chemicals in their bodies.B
fishes increase in number rapidly.C
harmful chemicals get washed into water bodies and enter the aquatic food chains.D
fishes have special enzymes in their body to digest these pesticides.Click an option to check your answer
Q. 32
World Environment day is celebrated on
A
June1B
June 5C
June3D
June8Click an option to check your answer
Q. 33
In ______ presence of _____ along
with sunlight is required to make organic
compounds.
A
consumers; carbonB
producers; carbonC
decomposers; chlorophyllD
producers; chlorophyllClick an option to check your answer
Q. 34
The functional unit of environment
A
CarbonB
EcosystemC
NitrogenD
plasticClick an option to check your answer
Q. 35
One of the following is a micro-consumer. This one is :
A
accumulationB
fungiC
liceD
pollutionClick an option to check your answer
Q. 36
Which of the following constitute the food chain?
A
grass, goat and humanB
goat , cow and elephantC
Biological concentrationD
grass,wheat and mangoClick an option to check your answer
Q. 37
If UNEP had not passed any regulation to control
the CFC levels, then what could have been the
possible consequences after a few years?
A
Lowering of the temperature of the earth.B
Increase in natural calamities like Tsunamis and cyclones.C
Major amount of UV radiations reaching the earth, therefore, multifold increase in problems like cancer.D
Increase in CFC levels and thus increase in global warming.Click an option to check your answer
Q. 38
_____ are producers.
A
Green plantsB
AmoebaC
MushroomsD
SunlightClick an option to check your answer
Q. 39
The UV radiation from the sun is likely to cause _____________ in human.
A
omnivoresB
herbivoresC
Skin cancerD
Lung cancerClick an option to check your answer
Q. 40
UV rays are harmful to the life on earth. However,
they play an important role in the upper
atmosphere. Which of the following statements
holds for this fact?
(i) UV rays are needed for the formation of the ozone layer in the upper atmosphere.
(ii) UV rays are less active and inside the
atmosphere, they become activated due to the other atmospheric contents.
(iii) In the upper atmosphere, UV rays have less energy and are not harmful and form the part of the atmosphere.
(i) UV rays are needed for the formation of the ozone layer in the upper atmosphere.
(ii) UV rays are less active and inside the
atmosphere, they become activated due to the other atmospheric contents.
(iii) In the upper atmosphere, UV rays have less energy and are not harmful and form the part of the atmosphere.
A
Only (i)B
Only (ii)C
Only (iii)D
Both (i) and (iii)Click an option to check your answer
Q. 41
What idea did the brothers come up with to run the factory more affordably?
A
To use solar energyB
To use wind energyC
To use hydroelectric powerD
To run the factory with the biogas produced from cow dungClick an option to check your answer
Q. 42
Which of the following is an example of producers?
A
Plastic cansB
PolytheneC
plastic bagsD
grassClick an option to check your answer
Q. 43
In a given food chain the amount of energy at fourth trophic level is 5 KJ, what will be the energy at producer level ?
A
0.5KJB
5.5KJC
5000KJD
500kJClick an option to check your answer
Q. 44
Every food chain in the ecosystem starts with ________, which are the original source of energy.
A
saprophytesB
parasitesC
producersD
none of theseClick an option to check your answer
Q. 45
How much of the sun's effective radiation do we receive on Earth?
A
More than 50%B
Exactly 50%C
NoneD
Less than 50%Click an option to check your answer
Q. 46
What is photosynthesis?
A
The process of converting solar energy into food energyB
The process of converting food into solar energyC
The process of converting water into oxygenD
The process of converting oxygen into carbon dioxideClick an option to check your answer
Q. 47
A ____ is considered a terrestrial ecosystem.
A
oceanB
pondC
underground cavesD
forestClick an option to check your answer
Q. 48
The % of solar radiation absorbed by all the green
plants for the process of photosynthesis is about:
A
5%B
1%C
10%D
8%Click an option to check your answer
Q. 49
Classify the given activities under reuse and
recycle.
(i) Using plastic bucket for growing plants
(ii) Using old newspaper to make paper bags
(iii) Using broken glass to melt and make a new glass
(iv) Dissolving paper, bleaching and drying it to form a new paper.
(i) Using plastic bucket for growing plants
(ii) Using old newspaper to make paper bags
(iii) Using broken glass to melt and make a new glass
(iv) Dissolving paper, bleaching and drying it to form a new paper.
A
(i) and (ii) are examples of reuse and (iii) and (iv) are the examples of recycle.B
(ii) and (iii) are the examples of reuse and (i) and (iv) are the examples of recyle.C
(i), (ii) and (iii) are the examples of reuse and (iv) is the example of recycle.D
(i), (ii) and (iii) are the examples of recycle and (iv) is the example of reuse.Click an option to check your answer
Q. 50
Under what conditions is biogas formed?
A
In the presence of water and absence of air.B
In the presence of air only.C
In the presence of water only.D
In the absence of air only.Click an option to check your answer
Q. 51
Edaphic factors include ______.
A
multidirectionalB
bidirectionalC
Biotic componentsD
Abiotic componentsClick an option to check your answer
Q. 52
Food chain does not comprise of which of the
following groups of organisms?
(i) Grass, lion, rabbit, wolf
(ii) Plankton, man, fish, grasshopper
(iii) Wolf, grass, snake, tiger
(iv) Frog, snake, eagle, grass, grasshopper
(i) Grass, lion, rabbit, wolf
(ii) Plankton, man, fish, grasshopper
(iii) Wolf, grass, snake, tiger
(iv) Frog, snake, eagle, grass, grasshopper
A
(iii), (iv)B
(ii), (iii)C
(i), (iv)D
(i), (iii)Click an option to check your answer
Q. 53
Which of the following statements is correct?
A
All plants and bacteria are producers.B
All green plants and certain bacteria are producers.C
Only some species of green plants and all bacteria are producers.D
Only green plants are producers.Click an option to check your answer
Q. 54
Only ____ % of the energy can be transferred from one trophic level to the next trophic level.
A
11B
10C
2D
3Click an option to check your answer
Q. 55
Why are food chains important for most animals?
A
They provide food for animals.B
They help animals find shelter.C
They support the growth of plants.D
They help animals survive.Click an option to check your answer
Q. 56
The ____ is the functional unit of environment.
A
biomeB
genusC
ecosystemD
classClick an option to check your answer
Q. 57
In an area, the frog population decreased due to the
spread of some diseases. Frogs are prey for snakes,
but no major effect was seen in the population of
snakes. Instead, there was a decline in the pesticide
sale. What could be the possible reason?
A
Both frog and snake migrated to some other are.B
Snakes now depended on other organisms that must be the pests for the crops grown.C
Frogs stopped eating grains due to their infection.D
There is no relation between the decrease in frog population and pesticide sales.Click an option to check your answer
Q. 58
What percentage of sunlight is captured by plants to convert into food energy ?
A
0.2%B
2%C
0.1%D
1%Click an option to check your answer
Q. 59
Identify the proper food chain
A
Grass---- insect ----- frog ------ snakeB
Insect --- frog ---- grass ---- snakeC
Sunlight ---- producers---- carnivores ---- herbivoresD
Sunlight---- herbivores ---- carnivores ---- producersClick an option to check your answer
Q. 60
Which of the following is the set of greenhouse
gases in the atmosphere?
A
Carbon monoxide and sulphur dioxideB
Hydrogen sulphide and ozoneC
Ozone and CFCD
Carbon dioxide and methaneClick an option to check your answer
Q. 61
In an ecosystem, if a species of secondary
consumers is affected by a deadly disease, this will
affect the ecosystem by _______ .
A
decreasing the population of the producersB
disturbing the food chain of which the secondary consumer is a partC
giving more opportunity of survival to the predators of the secondary consumerD
giving more opportunity of survival to the prey of the secondary consumerClick an option to check your answer
Q. 62
What does "effective radiation" refer to in the passage?
A
Radiation that harms organismsB
Radiation that can be used by plants for photosynthesisC
Radiation that causes climate changeD
Radiation that is blocked by the atmosphereClick an option to check your answer
Q. 63
Different types of enzymes are present in our body
because:
(i) each enzyme has a specific function
(ii) each enzyme has a specific substrate
(iii) it makes the metabolic process faster
(iv) it makes the replacement of the defective enzymes easy
(i) each enzyme has a specific function
(ii) each enzyme has a specific substrate
(iii) it makes the metabolic process faster
(iv) it makes the replacement of the defective enzymes easy
A
All of theseB
(i) and (iv)C
(iii) and (iv)D
(i) and (ii)Click an option to check your answer
Q. 64
The ultimate source of energy in an ecosystemis the
A
sunB
moonC
consumerD
decomposerClick an option to check your answer
Q. 65
Which of the following statements is incorrect?
A
Plants convert solar energy into chemical energy.B
Producers prepare their own food from inorganic compounds.C
All green pD
Green plants get their food from organic compoundsClick an option to check your answer
Q. 66
Some wastes stay in the environment for a longer
duration because:
A
these are recyclable.B
they are non-biodegradable materials and decomposers cannot decompose them.C
they are biodegradable materials but decomposers do not act on these materials.D
these play role in maintaining ecological balance.Click an option to check your answer
Q. 67
Why is energy flow important in ecosystems?
A
It helps organisms survive.B
It supports the growth of plants.C
It maintains the balance of ecosystems.D
It reduces the need for food.Click an option to check your answer
Q. 68
Ozone formation is possible in the upper layers of
atmosphere because of the:
A
presence of longer wavelength radiationsB
presence of active molecules of carbonC
presence of high energy UV raysD
presence of activated oxides of carbonClick an option to check your answer
Q. 69
Which of the following would be affected by the
decrease in the producer population?
A
The organisms in the next trophic level.B
The organisms at the highest trophic level.C
None of the organisms in the food chain will be affected.D
All the organisms in the ecosystem.Click an option to check your answer
Q. 70
What will happen if deer is missing in the food
chain given below?Grass
Deer → Tiger
Deer → Tiger
A
The population of tiger increases.B
The population of grass decreases.C
Tiger will start eating grass.D
The population of tiger decreases and the population of grass increases.Click an option to check your answer
Q. 71
Hydrogen is labelled 'brown' if the manufacturing
process releases both carbon dioxide and carbon
monoxide to the air.
In what way is the manufacturing process of brown hydrogen WORSE than that of grey hydrogen for the environment?
In what way is the manufacturing process of brown hydrogen WORSE than that of grey hydrogen for the environment?
A
It releases into the atmosphere gases that cause acid rain.B
It releases into the atmosphere a gas that directly causes a greenhouse effect.C
It releases into the atmosphere a gas that is toxic to human beings.D
It releases into the atmosphere carbon which was stored for millions of years?Click an option to check your answer
Q. 72
Why is it amusing that we receive less than 50% of the sun's effective radiation on Earth?
A
Because it makes the Earth colder than it should beB
Because it means we rely on other sources of energyC
Because it shows how little energy we actually get from the sunD
Because it supports the growth of plantsClick an option to check your answer
Q. 73
Ozone shields the surface of earth from :
A
z-raysB
y-raysC
U-v raysD
X-raysClick an option to check your answer
Q. 74
The decomposers in an ecosystem:
A
do not break down organic compounds.B
convert inorganic material to simpler forms.C
convert organic material to inorganic forms.D
convert inorganic materials into organic compounds.Click an option to check your answer
Q. 75
Which of the following is not an example of abiotic factors?
A
WaterB
plantsC
heatD
WindClick an option to check your answer
Q. 76
Out of the following, which is a linear arrangement of organisms?
A
Food chainB
Food webC
ecological pyramidD
ecosystemClick an option to check your answer
Q. 77
Where is Tee Cee Industries located?
A
HaryanaB
Kunjpura villageC
Karnal districtD
All of the aboveClick an option to check your answer
Q. 78
Disposable plastics plates should not be used because ————–.
A
they are made up of non biodegradable materialsB
they are made up of biodegradable materialsC
They are made of toxic materialsD
they are made up of light weight materialClick an option to check your answer
Q. 79
Pesticide can disturb the balance within the
ecosystem by:
A
biomagnificationB
bioaccumulationC
eutrophicationD
indiscriminately killing pests and the predators of these pestsClick an option to check your answer
Q. 80
Which human-made material cannot be broken down by the action of bacteria?
A
plasticB
vegetable peelsC
flesh of dead animalD
Biotic constituentsClick an option to check your answer
Q. 81
What is the base of a food chain?
A
Big animals.B
Plants and algae.C
Carnivores.D
Soil and rocks.Click an option to check your answer
Q. 82
The thinning of ozone layer was first observed in
A
1970sB
1985sC
1980sD
1965sClick an option to check your answer
Q. 83
Which of the following are decomposers of dead organisms ? Bacteria Fungi Viruses
A
yes yes noB
yes yes yesC
yes no yesD
no no noClick an option to check your answer
Q. 84
A large number of food chains are interconnected
because the organisms at the higher trophic level
can depend on different types of organisms at
the lower trophic level. The existence of this
phenomenon in nature is called:
A
ecological pyramidB
ecological balanceC
food webD
food chainClick an option to check your answer
Q. 85
Flow of energy in an ecosystem is always:
A
unidirectionalB
bidirectionalC
multidirectionalD
no-specific directionClick an option to check your answer
Q. 86
Which activity would gradually reduce the
occurrence of pests, thereby reducing damage
to the crops year by year without affecting the
environment?
A
Crop rotationB
Use of DDTC
Use of manureD
Use of nitrogen based fertilizerClick an option to check your answer
Q. 87
One of the following is not a consumer. This one is :
A
unidirectionalB
BidirectionalC
giraffeD
algaeClick an option to check your answer
Q. 88
____ are biotic factors.
A
RocksB
GrassC
All of theseD
MountainsClick an option to check your answer
Q. 89
What is the primary source of energy for almost all organisms on Earth?
A
Geothermal energyB
Solar energyC
Nuclear energyD
Wind energyClick an option to check your answer
Q. 90
Excessive exposure of humans to UV rays results
in :
(i) damage to immune system
(ii) damage to lungs
(iii) skin cancer
(iv) peptic ulcers
(i) damage to immune system
(ii) damage to lungs
(iii) skin cancer
(iv) peptic ulcers
A
(iii), (iv)B
(i), (iii)C
(ii), (iv)D
(i), (ii)Click an option to check your answer
Q. 91
The decomposers in ecosystem:
A
jute carry bagsB
convert inorganic materials to simpler formsC
convert organic material to inorganic formsD
nylon cloth carry bagsClick an option to check your answer
Q. 92
Which of the following options complete the
statement given below?
Ozone is both harmful and beneficial because it is _____ .
Ozone is both harmful and beneficial because it is _____ .
A
poisonous to humans but it also prevents UV rays from entering into the earth's atmosphereB
poisonous in very high amounts, and its concentration is very low in the atmosphereC
poisonous but not for humansD
not poisonous to the ecosystemClick an option to check your answer
Q. 93
Which of the following constituents do not form part of an ecosystem?
A
Biotic constituentsB
Plastic bagsC
Abiotic constituentsD
All of the aboveClick an option to check your answer
Q. 94
Which of the following limits the number of trophic
levels in a food chain ?
A
WaterB
Polluted airC
Deficient food supplyD
Decrease in energy at higher trophic levelsClick an option to check your answer
Q. 95
In the food chain, herbivores fall at ____ level .
A
4thB
2ndC
3rdD
1stClick an option to check your answer
Q. 96
Which of the following statements holds true for
the energy flow in an ecosystem?
A
Energy can never be transferred bi-directionally between producers to consumers.B
Energy flows in a unidirectional manner in an ecosystem.C
Only 10% of the energy is transferred from one trophic level to the next trophic level.D
All of the aboveClick an option to check your answer
Q. 97
Which of the following is not a biodegradable pollutant?
A
DDTB
CottonC
cowD
sharkClick an option to check your answer
Q. 98
Which of the following is terrestrial ecosystem?
A
cottonB
paperC
A natural forestD
A lakeClick an option to check your answer
Q. 99
Which of the following can be used as raw material in a biogas plant?
A
Animal dungB
Crop residueC
Food wasteD
All of the aboveClick an option to check your answer
Q. 100
The best way to dispose waste is by
A
Green plants get their food from organic compoundsB
Separating biodegradable and nonbiodegradable waste before disposing in binsC
Producers prepare their own food from inorganic compoundsD
Throw the waste on road sideClick an option to check your answer
Q. 101
Fishes living in a crop field with standing water
are the part of a/an _______ ecosystem.
A
artificialB
none of theseC
naturalD
indigenousClick an option to check your answer
Q. 102
The most important trophic level in a terrestrial
food chain is:
A
the one with the least energy requirement per individualB
the one with the highest energy requirement per individualC
the one with moderate energy requirement per individualD
not dependent on the energy requirement per individual, thus, all are equally importantClick an option to check your answer
Q. 103
Why do all food chains start with plants?
A
Because plants can produce its own energy.B
Because plants do not require energy.C
Because plants are nutritious,D
Because plants are easily grown.Click an option to check your answer
Q. 104
Which of the following is not an example of abiotic factors?
A
PlantsB
HeatC
LightD
allClick an option to check your answer
Q. 105
Which of the following is the terrestrial ecosystem?
A
lakeB
HawksC
JackalD
natural forestClick an option to check your answer
Q. 106
Refrigerators have led to an environmental
imbalance and destroyed ecosystems. How?
A
Refrigerators use CFCs that are harmful to the ozone layer which forms a blanket around the earth.B
Refrigerators emit greenhouse gases.C
Storing food in refrigerators makes them environmentally unhealthy.D
Refrigerators emit CFCs that are harmful to only plant species.Click an option to check your answer
Q. 107
Which of the following is an abiotic component of
the ecosystem?
A
Sea-weedB
Lichens on a bare rockC
Weathered rockD
Planktons in a pondClick an option to check your answer
Q. 108
Disposable plastic plates should not be used because :
A
producers to decomposersB
they are made of non-biodegradable materialsC
they are made of light weight materialsD
primary consumer to secondary consumerClick an option to check your answer
Q. 109
If a grasshopper is eaten by a frog, then the energy
transfer will be from:
A
secondary consumer to primary consumerB
primary consumer to secondary consumerC
producer to primary consumerD
producer to decomposerClick an option to check your answer
Q. 110
The direction of energy flow in an ecosystem is:
A
bi-directionalB
uni-directional but in any directionC
uni-directional but from lower trophic level towards the higher trophic levelD
multi-directionalClick an option to check your answer
Q. 111
An ecosystem includes _____.
A
both living and non living componentsB
sometimes living sometimes non livingC
Interlinked food chainsD
Food served through websitesClick an option to check your answer
Q. 112
Accumulation of non-biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as
A
OmnivoresB
accumulationC
eutrophicationD
CarnivoresClick an option to check your answer
Q. 113
How do plants and algae make food?
A
By using sunlight or chemicals.B
By eating other plants.C
By hiding from animals.D
By sleeping during the day.Click an option to check your answer
Q. 114
If 100 J energy is available at the producer level in a food chain then the energy available to the secondary consumer will be:
A
10 JB
0.1JC
1JD
0.01 JClick an option to check your answer
Q. 115
What will happen if deer is missing from the food chain : grass → deer → Tiger ?
A
fish green algae mosquito larvaeB
population of tiger decrease and grass increasesC
tiger will start eating grassD
mosquito larvae fish green algaeClick an option to check your answer
Q. 116
What factor limits the number of trophic levels in a food chain?
A
Less availability of foodB
Polluted airC
WaterD
Decrease in energy at higher trophic levelsClick an option to check your answer
Q. 117
Which of the following are environment friendly practices?
A
walking to school instead of getting your mother to drop you on her scooterB
carrying cloth bags to put purchases in while shoppingC
allD
switching off unnecessary lights and fansClick an option to check your answer
Q. 118
The number of atoms of oxygen in ozone______.
A
22B
2C
3D
33Click an option to check your answer
Q. 119
What happens if one part of a food chain is taken away?
A
Other animals become healthier.B
Some animals may die out.C
Plants grow faster.D
Animals start eating more.Click an option to check your answer
Q. 120
Which of the statements given below is correct?
A
Omnivores are in the middle of the food chain.B
Omnivores are either in the middle or at the top of the food chain.C
Omnivores are at the top of the food chain.D
Omnivores are capable of modifying the natural food chain.Click an option to check your answer
Q. 121
In an ecosystem, matter and energy are two fundamental inputs. How do they typically move within an ecosystem?
A
Energy moves bidirectionally, and matter circulates repeatedly.B
Energy circulates repeatedly, and matter moves unidirectionally.C
Energy moves unidirectionally, and matter circulates repeatedly.D
Energy moves multidirectionally, and matter moves bidirectionallyClick an option to check your answer
Q. 122
In the given food chain, suppose the amount of
energy at fourth trophic level is 5 kJ, what will be
the energy available at the producer level?
Grass → Grasshopper → Frog → Snake → Hawk
Grass → Grasshopper → Frog → Snake → Hawk
A
500 KJB
50 kJC
5 kJD
5000 kJClick an option to check your answer
Q. 123
Biological magnification is defined as:
A
the accumulation of harmful chemicals at each trophic level of the food chain.B
the accumulation of organic matter at the first trophic level ofthe food chain.C
the reduction of energy at each trophic level of the food chain.D
an increase in the population of a species at each trophic level of the food chain.Click an option to check your answer
Q. 124
Which of the following belongs to the category of primary consumers ?
A
Snake and frogB
Grasshopper and cattleC
Water beetles and fishD
water onlyClick an option to check your answer
Q. 125
Which of the following is the formula of ozone?
A
O3B
O5C
O2D
O6Click an option to check your answer
Q. 126
Which of the following is NOT a type of natural
ecosystem?
A
SeaB
Crop fieldC
EstuariesD
Lakes and pondsClick an option to check your answer
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