AP 10th Class Biology Bits Chapter 9 Our Environment with Answers

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AP State Syllabus 10th Class Biology Bits 9th Lesson Our Environment with Answers

Concept – 1 : Introduction – Food Chain – Food web

Question 1.
Which of the following do plants not compete for ?
A) Water
B) Food
C) Space
D) All of the above
Answer:
D) All of the above

Question 2.
……………… denotes the animal’s position and its food.
A) Trophic level
B) Niche
C) Estuary
D) Cutch
Answer:
B) Niche

Question 3.
Insectivores feed on Aphids, Grasshopper. We can represent the statement through one of the following.
A) Food level
B) Food chain
C) Trophic level
D) Food web
Answer:
D) Food web

Question 4.
The graphic representation of the feeding level of an ecosystem is …………………..
A) Pyramid
B) Biosphere
C) Ecological pyramid
D) Food chain
Answer:
C) Ecological pyramid

Question 5.
Any type of plant or animal material , that can be converted into energy is called …………………..
A) Bio energy
B) Biomass
C) Bio evolution
D) Bio quantity
Answer:
B) Biomass

Question 6.
The sum of physical and biological factors along with their chemical interactions that effect an organism is called ……………………
A) Ecosystem
B) Atmosphere
C) Environment
D) Food chain
Answer:
C) Environment

Question 7.
Air, water, soil, sunlight are called ………………… factors.
A) Biotic
B) Abiotic
C) Chemical
D) Physical
Answer:
B) Abiotic

Question 8.
The region of the world of living things is termed as:
A) Biosphere
B) Atmosphere
C) Environment
D) Ecqsystem
Answer:
A) Biosphere

Question 9.
The missing organism in food chain of grass → ? → frog → snake is :
A) Grasshopper
B) Lion
C) Goat
D) Amoeba
Answer:
A) Grasshopper

Question 10.
Charles Elton relates to
A) Embryology
B) Physiology
C) Ecology
D) Geology
Answer:
C) Ecology

Question 11.
Identify the correct food chain.
A) Plant → frog → snake → grosshopper
B) Plant → grasshopper frog → snake
C) Grasshopper → plant → snake → frog
D) Frog → plant → grasshopper → snake
Answer:
B) Plant → grasshopper frog → snake

Question 12.
Which of the following constitutes a food chain?
A) Grass, Wheat and Mango
B) Grass, Goat and Human
C) Goat, Cow and Elephant
D) Grass, Fish and Goat
Answer:
D) Grass, Fish and Goat

Question 13.
An ecosystem includes
A) all living organisms
B) non-living objects
C) both living organisms and non-living objects
D) all living organisms and input of sun’s energy
Answer:
C) both living organisms and non-living objects

Question 14.
What will happen if deer is missing in the food chain given below ? Grass → Deer → Tiger
A) The population of tigers increases
B) The population of grass decreases
C) Tigers will start eating grass
D) The population of tigers decreases and the population of grass increases.
Answer:
D) The population of tigers decreases and the population of grass increases.

Question 15.
Which one of the following is not a consumer ?
A) Giraffe
B) Antelope
C) Algae
D) Alligator
Answer:
C) Algae

Question 16.
Which of the following is not a producer?
A) Grass
B) Zooplankton
C) Phytoplankton
D) Paddy
Answer:
B) Zooplankton

Question 17.
In a food chain, the third trophic level is always occupied by :
A) carnivores
B) herbivores
C) decomposers
D) producers
Answer:
A) carnivores

Question 18.
Which of the following statement is incorrect regarding producers ?
A) All green plants and blue green algae are producers.
B) Producers prepare their own food from ready made organic compounds.
C) Producers prepare their own food from inorganic compounds.
D) Plants convert solar energy into chemical energy.
Answer:
B) Producers prepare their own food from ready made organic compounds.

Question 19.
Organisms which synthesise carbohydrates by using radiant energy are called:
A) decomposers
B) producers
C) herbivores
D) carnivores
Answer:
B) producers

Question 20.
A network of several food chains is known as :
A) ecosystem
B) food web
C) ecological pyramid
D) food chain
Answer:
B) food web

Question 21.
Choose the right one for the empty box.

A) Grasshopper
B) Snake
C) Frog
D) Hawk
Answer:
B) Snake

Question 22.
Which of the following is biotic factor ?
A) Air
B) Soil
C) Plant
D) Sunlight
Answer:
C) Plant

Question 23.
……………. forms food web.
A) Chains
B) Food chains
C) Abotic factors
D) Biotic factors
Answer:
B) Food chains

Question 24.
The type of forests are determined by ………………..
A) Temperature, sunlight
B) Sunlight, plants
C) Temperature, rainfall
D) Light, surroundings
Answer:
A) Temperature, sunlight

Question 25.
……………… indicates the relationship of food.
A) Food web
B) Food chain
C) Niche
D) Habitat
Answer:
A) Food web

Question 26.
………………. denotes the mode of life of an organism in the food web.
A) Niche
B) Food chain
C) Pyramid of biomass
D) Pyramid of numbers
Answer:
A) Niche

Question 27.
In the food chain which shows the human being, big fish and the small fish, the last place is occupied by …………………….
A) Fish
B) Moss
C) Human being
D) Whale
Answer:
C) Human being

Question 28.
Which of the following should be less, so that the top most carnivores will get more energy ?
A) Producers
B) Trophic levels
C) Consumers
D) Moss
Answer:
B) Trophic levels

Question 29.
The material which the organism can’t digest …………………
A) Cellulose
B) Fats
C) Cellulose, lignin
D) Proteins
Answer:
C) Cellulose, lignin

Question 30.
The flow of materials between organisms and their environment is called ……………………..
A) Nitrogen cycle
B) Carbon cycle
C) Bio geochemical cycle
D) Hydrogen cycle
Answer:
C) Bio geochemical cycle

Question 31.
Which of the following can convert the absorbed (Solar energy) sunlight into chemical energy ?
A) Animals
B) Decomposers
C) Producers
D) Carnivores
Answer:
C) Producers

Question 32.
The pyramid of numbers is always upright. If it changes …………………..
i) the number of producers will be more in the trophic level.
ii) a tree is the producer.
iii) it is always upright. Change does not occur.
iv) Producers are at the base only though the pyramid is in any form.
A) i only
B) i, ii, iii
C) i, ii, iv
D) All are correct
Answer:
C) i, ii, iv

Question 33.
Consider the following.
a) Photosynthesis is the important life process for all plants.
b) Abiotic factors such as CO₂, light and water are not necessary for organisms.
A) Both a and b are true
B) a is true, b is false
C) a is false, b is true
D) Both a and b are false
Answer:
B) a is true, b is false

Question 34.
Consider the following.
a. It would be better to reduce the reproductive capacity of male insect organisms.
b. Crop rotation method is the best practice.
A) a, b both are true
B) a is true, b is false
C) a is false, b is true
D) Both a and b are false
Answer:
A) a, b both are true

Question 35.
What does a food chain always start with ?
A) Herbivore
B) Carnivore
C) Producer
D) Predator
Answer:
C) Producer

Question 36.
The food chain ends with ………………..
A) Producer
B) Saprophyte
C) Decomposer
D) Consumer
Answer:
D) Consumer

Question 37.
The number of levels in a food chain comprises mostly
A) 3
B) 4
C) 5
D) 2
Answer:
B) 4

Question 38.
……………… denotes the relationship between the biotic factors.
A) Food pyramid
B) Food quantity
C) Food chain
D) Producers
Answer:
C) Food chain

Question 39.
Which of the following indicates the transfer of energy from one organism to the other ?
A) Food pyramid
B) Path of energy flow
C) Path of energy loss
D) Food chain
Answer:
D) Food chain

Question 40.
Correct statement of Charles Elton.
A) Carnivores at the top of the pyramid.
B) Energy trapping is high at the top of the pyramid
C) No producers at the top of the pyramid
A) A only
B) Both A and B
C) C only
D) Both A and C
Answer:
D) Both A and C

Question 41.
Between grass and grasshopper food chain ends with
A) Producer
B) Saprophyte
C) Decomposers
D) Consumers
Answer:
D) Consumers

Question 42.
You have prepared a work sheet for collecting information on observing different food chains. One of the following is important component in the work sheet.
A) Details of group members
B) Food relationship
C) Names of animals
D) Number of carnivores
Answer:
B) Food relationship

Question 43.
Consider the following.
a. The place of organism in a food web is called “Niche”
b. Niche explains the living habits and food habits of organism
A) Both a & b are true
B) a is false, b is true
C) Both a & b are false
D) a is true, b is false
Answer:
A) Both a & b are true

Question 44.
The primary consumer is …………………
A) Rabbit
B) Tiger
C) Frog
D) Snake
Answer:
A) Rabbit

Question 45.
Choose the right one for the empty box.

A) Grasshopper
B) Snake
C) Frog
D) Hawk
Answer:
B) Snake

Question 46.
Grass, grass hopper, snake, frog, eagle – find out the correct flow chart.
A) grass → grass hopper → frog → snake → eagle
B) grass ← grass hopper ← frog ← snake ← eagle
C) grass hopper → eagle → frog → grass → snake
D) eagle → snake → grass hopper → frog → grass
Answer:
A) grass → grass hopper → frog → snake → eagle

Concept – 2 : Ecological Pyramids

Question 47.
……………… denotes the relationship among the organisms in a food chain.
A) Giza pyramid
B) Food web
C) Ecological pyramid
D) Trophic level
Answer:
C) Ecological pyramid

Question 48.
A grass land ecosystem had grass, grasshopper, snake, rabbit, frog and eagle. Then what are the primary consumers ?
A) Grasshopper and frog
B) Grasshopper and snake
C) Grasshopper and rabbit
D) Grasshopper and eagle
Answer:
C) Grasshopper and rabbit

Question 49.
Pyramid: Egypt:: Ecological pyramids:
A) Odum
B) Francis Bacon
C) Charles Darwin
D) Charles Elton
Answer:
D) Charles Elton

Question 50.
By which of the following processes, biomass will be formed in organisms?
A) Respiration
B) Light respiration
C) Photosynthesis
D) Carbon cycle
Answer:
C) Photosynthesis

Question 51.
When biomass is used for energy production, that is called ………………….
A) Bio fuel
B) Bio utilisation
C) Biosphere
D) Food pyramid
Answer:
A) Bio fuel

Question 52.
The transfer of energy from one trophic level to other trophic level
A)20 – 30%
B) 30 – 40 %
C) 50 – 70 %
D) 10 – 20 %
Answer:
D) 10 – 20 %

Question 53.
The ……………. feed on phytoplanktons.
A) Zoo planktons
B) Producers
C) Biomass
D) Insectivorous plants
Answer:
A) Zoo planktons

Question 54.
What happens if plants shed their leaves in Autumn season ?
A) Loss of energy occur
B) Plants will die
C) Decomposers will be destroyed
D) Loss of biomass occur
Answer:
D) Loss of biomass occur

Question 55.
Observe a and b statements.
a. The number of organisms in a food chain can be represented graphically in a pyramid.
b. Each bar represents the number of individuals at each trophic level in the food chain.
A) Both a and b are true
B) a is true, b is false
C) a is false, b is true
D) Both a and b are false
Answer:
A) Both a and b are true

Question 56.
In the figure given below, the various trophic levels are shown in the form of a pyramid. At which trophic level the maximum energy is available ?

A) T₄
B) T₂
C) T₁
D) T₃
Answer:
C) T₁

Question 57.
The organic material of biological origin that is ultimately derived from the fixation of carbon dioxide by trapping solar energy during photosynthesis is called:
A) Biomass
B) Biofuel
C) Both A and B
D) Pyramid
Answer:
A) Biomass

Question 58.
Which of the following represents a food chain in a pond ecosystem ?

Primary producers	Primray consumers	Secondary consumers
A) Green algae	fish	mosquito larvae
B) Fish	green algae	mosquito larvae
C) Mosquito larvae	fish	green algae
D) Green algae	mosquito larvae	fish

Answer:
D) Green algae mosquito larvae fish

Question 59.
In an aquatic ecosystem, the biomass of phytoplankton is :
A) quite negligible
B) greater
C) lesser
D) none of these
Answer:
C) lesser

Question 60.
Observe the a and b statements.
a. In the pyramid of numbers, as we move to top position the number of organisms decreases.
b. As the number of organisms decrease, the quantity of organisms also decrease.
A) Both a and b are true
B) a is true, b is false
C) a is false, b is true
D) Both a arid b are false
Answer:
A) Both a and b are true

Question 61.
Find out the wrong one in the given flow chart.

A) 1, 2 correct
B) 2, 3, 4 correct
C) 2, 4 correct
D) All are correct
Answer:
D) All are correct

Question 62.

In this food chain, the organism which belongs to the second trophic level is………………
A) Snake
B) Plant
C) Grasshopper
D) Frog
Answer:
C) Grasshopper

Question 63.
Consider the following.
a) Aphids are small in size but their number is more.
b) Wood peckers eat aphids. Their number is less, but size is large.
A) Both a & b are true
B) a is true, b is false
C) a is false, b is true
D) Both a & b are false
Answer:
A) Both a & b are true

Question 64.
According to Charles Elton
A) carnivores are atthe top ofthe pyramid
B) energy trapping is high at the top of the pyramid
C) no producers at the top of the pyramid
D) A and C
Answer:
D) A and C

Question 65.
If we invert the pyramid of numbers …………… is formed.
A) Pyramid of biomass
B) Pyramid of energy
C) Pyramid of Egypt
D) Biomass
Answer:
A) Pyramid of biomass

Question 66.
The plants float on the surf ace water of the sea ……………………
A) Phytoplanktons
B) Zoo planktons
C) Producers
D) Pyramid of number
Answer:
A) Phytoplanktons

Question 67.
Phytoplanktons means
A) Plants growing on river side
B) Plants growing on surface of water
C) Plants submerged in water
D) Plants growing on trees
Answer:
B) Plants growing on surface of water

Question 68.
Match the items of first line with second line.
First line :
1. Charles Elton
2. Charles Darwin
3. Lavoisier

Second line:
a) Respiration is a combustion process
b) Ecosystem
c) Evolution
A) 1 – b, 2 – c 3 – a
B) 1 – b, 2 – a 3 – c
C) 1 – c 2 – a 3 – b
D) 1 – c 2 – b 3 – a
Answer:
A) 1 – b, 2 – c 3 – a

Question 69.
Consumers are divided based on the factors given below in an ecosystem .
A) Consumed food
B) Trophic level
C) Consumed food, trophic level
D) Energy
Answer:
C) Consumed food, trophic level

Question 70.
Consider the following.
a. Carnivores are on the top of pyramid of number.
b. These are large in number and size.
A) Both a and b are true
B) a is true, b is false
C) Both a and b are false
D) a is false, b is true
Answer:
B) a is true, b is false

Question 71.
Consider the following.
a. Biomass is prominent in terrestrial ecosystem
b. Pyramid of biomass is always upright
A) Both a and b are true
B) a is true, b is false
C) b is true, a is false
D) Both a and b are false
Answer:
C) b is true, a is false

Question 72.
Observe the following a and b statements:
a) The number of organisms decrease as we move from producers to consumers.
b) Theconsumersareplacedinthefront position in a food chain.
A) Both a and b are true
B) a is true, b is false
C) a is false, b is true
D) Both a and b are false
Answer:
B) a is true, b is false

Question 73.
Observe the a and b statements.
a. The less energy will be available for the higher consumers.
b. Producers will get more energy.
A) Both a and b are true
B) a is true, b is false
C) a is false, b is true
D) Both a and b are false
Answer:
A) Both a and b are true

Question 74.
Observe the a and b statements :
a) Producers are represented atthebase of ‘the pyramid’.
b) The top of the pyramid is represented as empty.
A) Both a and b are true
B) a is true, b is false
C) a is false, b is true
D) Both a and b are false
Answer:
A) Both a and b are true

Question 75.
If a grasshopper is eaten by a frog, then the energy transfer will be from :
A) producer to decomposer
B) producer to primary consumer
C) primary consumer to secondary consumer
D) primary consumer to tertiary consumer
Answer:
C) primary consumer to secondary consumer

Question 76.
In the food chain below, if the amount of energy available at fourth trophic level is 5 KJ, what is the energy available at the producer level ?
Grass → Grasshopper → Frog → Snake → Hawk
A) 500 KJ
B) 50 KJ
C) 5000 KJ
D) 5 KJ
Answer:
C) 5000 KJ

Question 77.
The concept of ‘Ecological Pyramid’ was first proposed by……………….
A) Lindemann
B) Lamarck
C) Steel
D) Charles Elton
Answer:
D) Charles Elton

Question 78.
Fill the empty box choosing the right one from the following.

Type of pyramid	Base
Pyramid of number	Number of organisms
?	Amount of energy

A) Geographical pyramid
B) Pyramid of energy
C) Pyramid of biomass
D) Giza pyramid
Answer:
B) Pyramid of energy

Question 79.
Consider the following.
a. The amount of bio-mass decreases from producers to carnivores in: terrestrial ecosystem.
b. The amount of bio-mass decreases from producers to carnivores in aquatic ecosystem.
A) Both a and b are true
B) a is true, b is false
C) Both a and b are false
D) a is false, b is true
Answer:
A) Both a and b are true

Question 80.
Find out the missing thing from the table

Type of pyramid	Base
Pyramid of number	Number of organisms
Pyramid of energy	?

A) Ecological pyramid
B) Flow of energy
C) Flow of biomass
D) Giza pyramid
Answer:
B) Flow of energy

Question 81.
Find out the pyramid with right position of the organisms.

A) i only
B) i, ii,
C) All are correct
D) ii, iii.
Answer:
B) i, ii,

Question 82.
Herbivores disappeared from ecosystem. Find the pyramid related to that.

Answer:

Question 83.
Consider the following.
a) Biomass in each trophic level is always less than the trophic level below.
b) Biomass is a measure of the amount of food available.
A) Both a & b are true
B) a is true, b is false
C) a is false, b is true
D) Both a & b are false
Answer:
A) Both a & b are true

Concept – 3 : The Story of Kolleru Lake

Question 84.
In an industrial area so many industrial effluents are released into the water. If the residues are found in the organisms of food chain it is ……………..
A) Bio – accumulation
B) Bio – oxygen
C) Bio – pollution
D) Bio – magnification
Answer:
A) Bio – accumulation

Question 85.
Rotation of crops, Genetic strains, Sterility are the ……………… methods to prevent the pests.
A) Bio – accumulation
B) Bio – magnification
C) Biological control
D) Environmental ethics
Answer:
C) Biological control

Question 86.
Kolleru lake discharges its water into the Bay of Bengal through the ………………. channel.
A) River Narmada
B) River Godavari
C) Maddileru channel
D) Upputeru channel
Answer:
D) Upputeru channel

Question 87.
Kolleru lake attracts migrating birds from Asia and Eastern Europe of about ……………. birds per year.
A) 25,00,000 birds
B) 20,00,000 birds
C) 35,00,000 birds
D) 15,00,000 birds
Answer:
B) 20,00,000 birds

Question 88.
Expand BOD.
A) Biological Oxygen Deficiency
B) Basic Organic Dominance
C) Biological Oxygen Demand
D) Basal Organic Demand
Answer:
C) Biological Oxygen Demand

Question 89.
In 1999 November, the Government of Andhra Pradesh had declared the Kolleru lake as …………………
A) Bird sanctuary
B) Wild life sanctuary
C) National park
D) Pisciculture centre
Answer:
A) Bird sanctuary

Question 90.
The Mercury, Arsenic and Lead in pesticides ………………
A) do not break down
B) break down
C) increases purity
D) can’t accumulate
Answer:
A) do not break down

Question 91.
Entry of pollutants into a food chain is …………………….
A) Bio-accumulation
B) Bio-magnification
C) Bio-mass
D) Bio-degradation
Answer:
A) Bio-accumulation

Question 92.
The bio indicators of heavy metal pollutants
A) Cadmium
B) Fishes
C) Aquatic animals
D) Mercury
Answer:
B) Fishes

Question 93.
The tendency of pollutants to concentrate as they move from one trophic level to the next is ……………………
A) Bio – control
B) Bio – magnification
C) Bio – accumulation
D) Bio – remediation
Answer:
B) Bio – magnification

Question 94.
The common scale carp which is used as food in Edulabad Water Reservoir is
A) Cyprinus Carpio
B) Mrigala Mrigala
C) Cutla Cutla
D) Cyprinus Cyprinus
Answer:
A) Cyprinus Carpio

Question 95.
What happened in Kolleru lake due to over alkalinity and mud formation?
The percentage of O₂ decrease b. More increase in Biological Oxygen Demand and impact on aquatic organisms.
A) a is true
B) b is true
C) Both a and b are true
D) Both a and b are false
Answer:
C) Both a and b are true

Concept – 4 : Edulabad Water Reservoir

Question 96.
The metal which causes Minamata disease is ………………….
A) Iron
B) Mercury
C) Zinc
D) Arsenic
Answer:
B) Mercury

Question 97.
Which of the following is not an alternative to pesticides ?
A) Rotation of crops
B) Sterility
C) Genetic strains
D) Spray of pesticides
Answer:
D) Spray of pesticides

Question 98.
Many pollutants are released into water from an industrial area. If residue appears in living organisms of a food chain, then it is called
A) Bio remediation
B) Bio mimicry
C) Bio pollution
D) Bio magnification
Answer:
D) Bio magnification

Question 99.
The aquatic biota is being contaminated with heavy metals due to industrialization and anthropogenic activities.
The above statement is ……………………..
A) Correct
B) Wrong
C) Not accurate
D) Can’t say
Answer:
A) Correct

Question 100.
You observed fish in the industrial areas. Some of the following heavy metals are found in them.
i) lead
ii) cadmium
iii) nickel
A) i only
B) i, ii only
C) i, iii only
D) All are correct
Answer:
D) All are correct

Question 101.
Arsenic elements are seen in milk of cow. The correct word that explains it.
A) Bio control
B) Bio accumulation
C) Bio remediation
D) Bio magnification
Answer:
D) Bio magnification

Question 102.
The following is not a reason for imbalance in ecosystem.
A) Deforestation
B) Same crop harvest
C) Crop rotation
D) Constructing dams
Answer:
C) Crop rotation

Question 103.
Latha says excessive nutrient addition, especially from anthrppogenic sources, led to explosive weed growth. Sarala denied Latha’s hypothesis.
A) Latha is wrong
B) Sarala is wrong
C) Both are wrong
D) Latha is correct
Answer:
D) Latha is correct

Question 104.
The bio-accumulated components of pesticides which entered the food chain are :
A) Arsenic
B) Mercury
C) Lead
D) All of the above
Answer:
D) All of the above

Question 105.
Which of the following is not a biodegradable substance ?
A) Cotton
B) Animal bones
C) Aluminuim foil
D) Wood
Answer:
C) Aluminuim foil

Question 106.
The physiological disorder due to accumulation of heavy metals into human beings through food chain is
A) Renal damage
B) Tooth decay
C) Loss of eye sight
D) Heart diseases
Answer:
A) Renal damage

Question 107.
In Japan in 1956, the Minamata disease was caused by this highly toxic chemical in water.
A) Methyl Isocyanide
B) Mercury Isocyanide
C) Potassium Isocyanide
D) Methyl Mercury
Answer:
D) Methyl Mercury

Concept – 5 : Sparrow Campaign

Question 108.
The cruel campaign against which bird is initiated in 1958 in China ?
A) Parrots
B) Sparrows
C) Crows
D) Vultures
Answer:
B) Sparrows

Question 109.
“Sparrow Campaign” incident occurred in
A) China
B) Japan
C) Korea
D) India
Answer:
A) China

Question 110.
These insects population grew due to killing of sparrows in China in 1958.
A) Cockroach
B) Locusts
C) Earthworm
D) B & C
Answer:
B) Locusts

Question 111.
Killing of sparrows resulted in
A) Controlling of locusts
B) Controlling of human population
C) Great Chinese famine
D) Production of food
Answer:
C) Great Chinese famine

Question 112.
What did people do in Sparrowg Campaign in China ?
A) Nests were torn down
B) Eggs were broken
C) Nestlings were killed
D) All of the above
Answer:
D) All of the above

Concept – 6 : Steps towards Prevention

Question 113.
Ban all pesticides, this means that
A) Control on usage of pesticides
B) Prevention of pesticides
C) Promote eco friendly agricultural practices
D) Stop bio chemical factories
Answer:
C) Promote eco friendly agricultural practices

Question 114.
The correct way for facilitating shelter for growing population.
A) Destruction of forests and making shelter
B) Building shelters at sea – shore area
C) Making habitat without destructing eco-system
D) Converting marshy land into habitat
Answer:
C) Making habitat without destructing eco-system

Question 115.
Sujatha asked to cut grass and green plants to keep the surroundings clean. This is opposed by Raffee. Why ?
A) Need more labour
B) Takes more time
C) Disturbs equilibrium
D) Artificial environment
Answer:
C) Disturbs equilibrium

Question 116.
A farmer introduced lizards in his field. The phenomenon is …………………..
A) The method of environmental ethics
B) Bio – control
C) Bio – accumulation
D) Bio – magnification
Answer:
B) Bio – control