Multiple Choice Questions

Our Environment

Updated for CBSE 2027
Board Exam Preparation
126+ Practice Questions
Notes

Practice Questions with Answers

Total 126 questions available

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Q. 1
Which agricultural activites are affecting the environment?
A
Overuse of fertlisers and pesticides
B
All of the above
C
Using groundwater for irrigation
D
Extensive cropping in the same area of land
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Q. 2
In an ecosystem, the 10% of energy available for transfer from one trophic level to next is in the form of ____.
A
zooplankton
B
mechanical energy
C
chemical energy
D
light energy
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Q. 3
What type of support did Aditya and Amit receive for starting Amrit Fertilizers?
A
Financial support from the government
B
Technical support from the government
C
Both financial and technical support from the government
D
No government support
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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.
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Q. 5
The maximum number of levels in a food chain can be:
A
1-3
B
7-8
C
5-6
D
3-4
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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.
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Q. 7
Which of the following is not a non-biodegradable material ?
A
jute carry bag
B
nylon socks
C
skin cancer
D
peptic ulcers
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Q. 8
The % of solar radiation absorbed by all green plants for photosynthesis is about ———–.
A
2%
B
7%
C
1%
D
8%
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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 joules
B
100 joules
C
1000 joules
D
It depends on the type of terrestrial plant.
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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.
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Q. 11
What do Aditya Aggarwal and his brother Amit Aggarwal run in addition to Tee Cee Industries?
A
A steel plant
B
A cow shelter
C
A biogas project
D
All of the above
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Q. 12
Select the odd one out.
A
Synthetic polymers
B
Lime juice
C
Wood
D
Tomato leaves
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Q. 13
In a grazing food chain, primary consumers (herbivores) represent
A
T8 level
B
T9 level
C
T1 level
D
T2 level
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Q. 14
_____ is not an abiotic factor.
A
Animals
B
Altitude
C
Humidity
D
Temperature
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Q. 15
If Mr. X is consuming curd/yogurt in a food chain, at which trophic level should he be placed?
A
First trophic level
B
Second trophic level
C
Fourth trophic level
D
Third trophic level
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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 energy
B
chemical energy
C
light energy
D
heat energy
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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 weight
C
they are made of non-biodegradable materials.
D
they are made of biodegradable materials.
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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, leather
B
biomagnification
C
accumulation
D
plastic, detergent, glass
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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.
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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 web
B
ecological pyramid
C
ecosystem
D
food chain
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Q. 21
Which of these is NOT a correct sequence of a food chain?
A
Phytoplanktons → Zooplanktons → Fish
B
Grass → Insects → Frog → Snake
C
Seed grains → Rodents →→ Eagle
D
Seaweed → Zooplanktons →→Phytoplanktons
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Q. 22
Which of the following sets represents the substances required for the formation of ozone?
A
Oxygen and UV radiations
B
Oxygen and IR radiations
C
Carbon dioxide, water vapour and UV radiations
D
Oxygen and radiations of longer wavelengths
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Q. 23
Depletion of ozone is mainly due to ________
A
Putrefying bacteria
B
Cyanobacteria
C
chlorofluorocarbons
D
sulphur dioxide
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Q. 24
The organisms of higher trophic level which feed on several types of organisms belonging to lower trophic level, constitute the—————–.
A
decomposers
B
herbivores
C
ecological pyramid
D
food web
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Q. 25
In a food chain, the initial organism is usually :
A
herbivore
B
fruit peels, cake and lime juice
C
photosynthetic
D
cake, wood, grass
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Q. 26
The UV radiation from the sun is likely to cause _____________ in human.
A
Brain Cancer
B
Liver Cancer
C
Skin cancer
D
Lung cancer
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Q. 27
In an ecosystem, there is a flow of
A
chemical energy
B
energy only
C
energy and nutrients
D
nutrients only
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Q. 28
Which of the following pairs belong to the same trophic level?
A
Rabbit: Tiger
B
Vulture: Crow
C
Deer: Hawk
D
Frog: Lizard
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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 above
D
Switching off unnecessary lights and fans.
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Q. 30
In an ecosystem, the matter is recyclable because of
A
the sun, which is an ultimate source of energy
B
decomposition activity of decomposers
C
the fact that matter is made up ofatoms
D
None of these
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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.
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Q. 32
World Environment day is celebrated on
A
June1
B
June 5
C
June3
D
June8
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Q. 33
In ______ presence of _____ along with sunlight is required to make organic compounds.
A
consumers; carbon
B
producers; carbon
C
decomposers; chlorophyll
D
producers; chlorophyll
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Q. 34
The functional unit of environment
A
Carbon
B
Ecosystem
C
Nitrogen
D
plastic
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Q. 35
One of the following is a micro-consumer. This one is :
A
accumulation
B
fungi
C
lice
D
pollution
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Q. 36
Which of the following constitute the food chain?
A
grass, goat and human
B
goat , cow and elephant
C
Biological concentration
D
grass,wheat and mango
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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.
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Q. 38
_____ are producers.
A
Green plants
B
Amoeba
C
Mushrooms
D
Sunlight
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Q. 39
The UV radiation from the sun is likely to cause _____________ in human.
A
omnivores
B
herbivores
C
Skin cancer
D
Lung cancer
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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.
A
Only (i)
B
Only (ii)
C
Only (iii)
D
Both (i) and (iii)
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Q. 41
What idea did the brothers come up with to run the factory more affordably?
A
To use solar energy
B
To use wind energy
C
To use hydroelectric power
D
To run the factory with the biogas produced from cow dung
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Q. 42
Which of the following is an example of producers?
A
Plastic cans
B
Polythene
C
plastic bags
D
grass
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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
0.5KJ
B
5.5KJ
C
5000KJ
D
500kJ
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Q. 44
Every food chain in the ecosystem starts with ________, which are the original source of energy.
A
saprophytes
B
parasites
C
producers
D
none of these
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Q. 45
How much of the sun's effective radiation do we receive on Earth?
A
More than 50%
B
Exactly 50%
C
None
D
Less than 50%
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Q. 46
What is photosynthesis?
A
The process of converting solar energy into food energy
B
The process of converting food into solar energy
C
The process of converting water into oxygen
D
The process of converting oxygen into carbon dioxide
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Q. 47
A ____ is considered a terrestrial ecosystem.
A
ocean
B
pond
C
underground caves
D
forest
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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%
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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.
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.
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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.
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Q. 51
Edaphic factors include ______.
A
multidirectional
B
bidirectional
C
Biotic components
D
Abiotic components
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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
A
(iii), (iv)
B
(ii), (iii)
C
(i), (iv)
D
(i), (iii)
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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.
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Q. 54
Only ____ % of the energy can be transferred from one trophic level to the next trophic level.
A
11
B
10
C
2
D
3
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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.
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Q. 56
The ____ is the functional unit of environment.
A
biome
B
genus
C
ecosystem
D
class
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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.
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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%
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Q. 59
Identify the proper food chain
A
Grass---- insect ----- frog ------ snake
B
Insect --- frog ---- grass ---- snake
C
Sunlight ---- producers---- carnivores ---- herbivores
D
Sunlight---- herbivores ---- carnivores ---- producers
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Q. 60
Which of the following is the set of greenhouse gases in the atmosphere?
A
Carbon monoxide and sulphur dioxide
B
Hydrogen sulphide and ozone
C
Ozone and CFC
D
Carbon dioxide and methane
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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 producers
B
disturbing the food chain of which the secondary consumer is a part
C
giving more opportunity of survival to the predators of the secondary consumer
D
giving more opportunity of survival to the prey of the secondary consumer
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Q. 62
What does "effective radiation" refer to in the passage?
A
Radiation that harms organisms
B
Radiation that can be used by plants for photosynthesis
C
Radiation that causes climate change
D
Radiation that is blocked by the atmosphere
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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
A
All of these
B
(i) and (iv)
C
(iii) and (iv)
D
(i) and (ii)
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Q. 64
The ultimate source of energy in an ecosystemis the
A
sun
B
moon
C
consumer
D
decomposer
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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 p
D
Green plants get their food from organic compounds
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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.
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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.
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Q. 68
Ozone formation is possible in the upper layers of atmosphere because of the:
A
presence of longer wavelength radiations
B
presence of active molecules of carbon
C
presence of high energy UV rays
D
presence of activated oxides of carbon
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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.
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Q. 70
What will happen if deer is missing in the food chain given below?Grass
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.
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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?
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?
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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 be
B
Because it means we rely on other sources of energy
C
Because it shows how little energy we actually get from the sun
D
Because it supports the growth of plants
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Q. 73
Ozone shields the surface of earth from :
A
z-rays
B
y-rays
C
U-v rays
D
X-rays
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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.
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Q. 75
Which of the following is not an example of abiotic factors?
A
Water
B
plants
C
heat
D
Wind
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Q. 76
Out of the following, which is a linear arrangement of organisms?
A
Food chain
B
Food web
C
ecological pyramid
D
ecosystem
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Q. 77
Where is Tee Cee Industries located?
A
Haryana
B
Kunjpura village
C
Karnal district
D
All of the above
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Q. 78
Disposable plastics plates should not be used because ————–.
A
they are made up of non biodegradable materials
B
they are made up of biodegradable materials
C
They are made of toxic materials
D
they are made up of light weight material
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Q. 79
Pesticide can disturb the balance within the ecosystem by:
A
biomagnification
B
bioaccumulation
C
eutrophication
D
indiscriminately killing pests and the predators of these pests
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Q. 80
Which human-made material cannot be broken down by the action of bacteria?
A
plastic
B
vegetable peels
C
flesh of dead animal
D
Biotic constituents
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Q. 81
What is the base of a food chain?
A
Big animals.
B
Plants and algae.
C
Carnivores.
D
Soil and rocks.
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Q. 82
The thinning of ozone layer was first observed in
A
1970s
B
1985s
C
1980s
D
1965s
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Q. 83
Which of the following are decomposers of dead organisms ? Bacteria Fungi Viruses
A
yes yes no
B
yes yes yes
C
yes no yes
D
no no no
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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 pyramid
B
ecological balance
C
food web
D
food chain
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Q. 85
Flow of energy in an ecosystem is always:
A
unidirectional
B
bidirectional
C
multidirectional
D
no-specific direction
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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 rotation
B
Use of DDT
C
Use of manure
D
Use of nitrogen based fertilizer
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Q. 87
One of the following is not a consumer. This one is :
A
unidirectional
B
Bidirectional
C
giraffe
D
algae
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Q. 88
____ are biotic factors.
A
Rocks
B
Grass
C
All of these
D
Mountains
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Q. 89
What is the primary source of energy for almost all organisms on Earth?
A
Geothermal energy
B
Solar energy
C
Nuclear energy
D
Wind energy
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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
A
(iii), (iv)
B
(i), (iii)
C
(ii), (iv)
D
(i), (ii)
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Q. 91
The decomposers in ecosystem:
A
jute carry bags
B
convert inorganic materials to simpler forms
C
convert organic material to inorganic forms
D
nylon cloth carry bags
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Q. 92
Which of the following options complete the statement given below?
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 atmosphere
B
poisonous in very high amounts, and its concentration is very low in the atmosphere
C
poisonous but not for humans
D
not poisonous to the ecosystem
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Q. 93
Which of the following constituents do not form part of an ecosystem?
A
Biotic constituents
B
Plastic bags
C
Abiotic constituents
D
All of the above
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Q. 94
Which of the following limits the number of trophic levels in a food chain ?
A
Water
B
Polluted air
C
Deficient food supply
D
Decrease in energy at higher trophic levels
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Q. 95
In the food chain, herbivores fall at ____ level .
A
4th
B
2nd
C
3rd
D
1st
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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 above
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Q. 97
Which of the following is not a biodegradable pollutant?
A
DDT
B
Cotton
C
cow
D
shark
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Q. 98
Which of the following is terrestrial ecosystem?
A
cotton
B
paper
C
A natural forest
D
A lake
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Q. 99
Which of the following can be used as raw material in a biogas plant?
A
Animal dung
B
Crop residue
C
Food waste
D
All of the above
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Q. 100
The best way to dispose waste is by
A
Green plants get their food from organic compounds
B
Separating biodegradable and nonbiodegradable waste before disposing in bins
C
Producers prepare their own food from inorganic compounds
D
Throw the waste on road side
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Q. 101
Fishes living in a crop field with standing water are the part of a/an _______ ecosystem.
A
artificial
B
none of these
C
natural
D
indigenous
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Q. 102
The most important trophic level in a terrestrial food chain is:
A
the one with the least energy requirement per individual
B
the one with the highest energy requirement per individual
C
the one with moderate energy requirement per individual
D
not dependent on the energy requirement per individual, thus, all are equally important
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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.
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Q. 104
Which of the following is not an example of abiotic factors?
A
Plants
B
Heat
C
Light
D
all
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Q. 105
Which of the following is the terrestrial ecosystem?
A
lake
B
Hawks
C
Jackal
D
natural forest
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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.
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Q. 107
Which of the following is an abiotic component of the ecosystem?
A
Sea-weed
B
Lichens on a bare rock
C
Weathered rock
D
Planktons in a pond
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Q. 108
Disposable plastic plates should not be used because :
A
producers to decomposers
B
they are made of non-biodegradable materials
C
they are made of light weight materials
D
primary consumer to secondary consumer
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Q. 109
If a grasshopper is eaten by a frog, then the energy transfer will be from:
A
secondary consumer to primary consumer
B
primary consumer to secondary consumer
C
producer to primary consumer
D
producer to decomposer
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Q. 110
The direction of energy flow in an ecosystem is:
A
bi-directional
B
uni-directional but in any direction
C
uni-directional but from lower trophic level towards the higher trophic level
D
multi-directional
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Q. 111
An ecosystem includes _____.
A
both living and non living components
B
sometimes living sometimes non living
C
Interlinked food chains
D
Food served through websites
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Q. 112
Accumulation of non-biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as
A
Omnivores
B
accumulation
C
eutrophication
D
Carnivores
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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.
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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 J
B
0.1J
C
1J
D
0.01 J
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Q. 115
What will happen if deer is missing from the food chain : grass → deer → Tiger ?
A
fish green algae mosquito larvae
B
population of tiger decrease and grass increases
C
tiger will start eating grass
D
mosquito larvae fish green algae
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Q. 116
What factor limits the number of trophic levels in a food chain?
A
Less availability of food
B
Polluted air
C
Water
D
Decrease in energy at higher trophic levels
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Q. 117
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
D
switching off unnecessary lights and fans
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Q. 118
The number of atoms of oxygen in ozone______.
A
22
B
2
C
3
D
33
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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.
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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.
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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 bidirectionally
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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
A
500 KJ
B
50 kJ
C
5 kJ
D
5000 kJ
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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.
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Q. 124
Which of the following belongs to the category of primary consumers ?
A
Snake and frog
B
Grasshopper and cattle
C
Water beetles and fish
D
water only
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Q. 125
Which of the following is the formula of ozone?
A
O3
B
O5
C
O2
D
O6
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Q. 126
Which of the following is NOT a type of natural ecosystem?
A
Sea
B
Crop field
C
Estuaries
D
Lakes and ponds
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