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question_answer1)
Which of the following gases destroys the ozone layer?
A)
CFC done
clear
B)
\[C{{O}_{2}}\] done
clear
C)
\[S{{O}_{2}}\] done
clear
D)
\[N{{H}_{3}}\] done
clear
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question_answer2)
Which of the following represents herbivores in an ecosystem?
A)
Secondary consumers done
clear
B)
Primary consumers done
clear
C)
Producers done
clear
D)
Decomposers done
clear
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question_answer3)
Which of the following represents tropic levels in an ecosystem?
A)
Water level done
clear
B)
Energy level done
clear
C)
Salt level done
clear
D)
Oxygen level done
clear
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question_answer4)
Which of the following represents energy flow in an ecosystem?
A)
Multidirectional done
clear
B)
Unidirectional done
clear
C)
Bidirectional done
clear
D)
Circular done
clear
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question_answer5)
First link in any food chain is usually green plants. Which of the following statements gives the correct explanation about the above statement?
A)
Only green plants have the capacity to synthesize food using sunlight. done
clear
B)
There are more herbivores than carnivores in a food chain. done
clear
C)
Green plants are the only ones fixed at one place in the soil and do not show any kind of movements. done
clear
D)
Green plants are widely distributed. done
clear
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question_answer6)
Which of the following is the logical sequence of a food chain?
A)
\[\text{Producer}\to \text{consumer}\to \text{decomposer}\] done
clear
B)
\[\text{Decomposer}\to \text{consumer}\to \text{producer}\] done
clear
C)
\[\text{Producer}\to \text{decomposer}\to \text{consumer}\] done
clear
D)
\[\text{Consumer}\to \text{producer}\to \text{decomposer}\] done
clear
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question_answer7)
Tropic levels are formed by which of the following components?
A)
Only plants done
clear
B)
Only animals done
clear
C)
Only carnivores done
clear
D)
Organisms linked in food chain done
clear
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question_answer8)
Which of the following represents 'X' in the given figure?
A)
Air pollutant done
clear
B)
Smog done
clear
C)
Acid rain done
clear
D)
Salts done
clear
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question_answer9)
Which of the following organisms are secondary consumers in any food web?
A)
Only green plants done
clear
B)
Green plants, rabbits and rats done
clear
C)
Frogs, snakes and eagles done
clear
D)
Frogs, snakes and rabbits done
clear
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question_answer10)
Which of the following layers constitutes biosphere?
A)
Hydrosphere done
clear
B)
Lithosphere done
clear
C)
Atmosphere done
clear
D)
All of the above done
clear
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question_answer11)
Which of the following organisms occupy the top level of the ecological pyramid?
A)
Primary consumers done
clear
B)
Secondary consumers done
clear
C)
Producers done
clear
D)
Tertiary consumers done
clear
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question_answer12)
What happens to the earth's temperature due to the greenhouse effect?
A)
Increases done
clear
B)
Decreases done
clear
C)
Remains the same done
clear
D)
All of the above done
clear
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question_answer13)
Which of the following results when there is an increase in the population of sharks? \[Plankton\to Fish\to Seal\to Shark\]
A)
A decrease in the population of seals done
clear
B)
A decrease in the population of fish done
clear
C)
An increase in the population of seals done
clear
D)
An increase in the population of plankton done
clear
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question_answer14)
Which of the following chemicals cause the thinning of iayer P?
A)
Carbon monoxide done
clear
B)
Sulphur dioxide done
clear
C)
Chlorofluorocarbons done
clear
D)
Both (a) and (c) done
clear
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question_answer15)
What could be the threat due to global warming?
A)
Droughts done
clear
B)
Floods done
clear
C)
Earthquake done
clear
D)
Both (a) and (b) done
clear
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question_answer16)
Which of the following does NOT exist in a balanced ecosystem?
A)
Interconnected food chains done
clear
B)
Interdependence among living organisms and the environment done
clear
C)
Animals dependent on plants but plants are not dependent on animals done
clear
D)
Communities made up of different populations of organisms done
clear
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question_answer17)
Which of the following statements is true about P, Q, R and S?
A)
The energy level at P is larger than that at S. done
clear
B)
P is a producer while Q, R and S are consumers. done
clear
C)
R is smaller in size than Q. done
clear
D)
S is more in number than R. done
clear
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question_answer18)
Which of the following represents the total amount of energy stored and the number of organisms involved in a food chain?
A)
Food web done
clear
B)
Carbon cycle done
clear
C)
Ecological pyramid done
clear
D)
Population done
clear
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question_answer19)
According to the given food web, which of the following organisms gets its energy from the bird?
A)
Grasshopper done
clear
B)
Hawk done
clear
C)
Mouse done
clear
D)
Rabbit done
clear
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question_answer20)
What could 'X' be in the given food chain?
A)
Primary consumer done
clear
B)
Secondary consumer done
clear
C)
Tertiary consumer done
clear
D)
Producer done
clear
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question_answer21)
Which of the following represents food chain based on the given figure?
A)
\[\text{Snake}\to \text{bird}\to \text{plant}\to \text{grasshopper}\] done
clear
B)
\[\text{Plant}\to \text{grasshopper}\to \text{bird}\to \text{snake}\] done
clear
C)
\[\text{Grasshopper}\to \text{plant}\to \text{bird}\to \text{snake}\] done
clear
D)
\[\text{Bird}\to \text{grasshopper}\to \text{plant}\to \text{snake}\] done
clear
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question_answer22)
Which of the following refers to the pyramid of energy?
A)
Total energy in an ecosystem done
clear
B)
Graphic representation of energy levels at each tropic level done
clear
C)
Net energy in an ecosystem done
clear
D)
Energy consumed by various organisms done
clear
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question_answer23)
Which population would most likely decrease if the number of snakes greatly increased?
A)
Green plants done
clear
B)
Mice done
clear
C)
Snakes done
clear
D)
Hawks done
clear
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question_answer24)
Which of the following sequences show how energy moves in a food chain?
A)
\[\text{Grass}\to \text{Frogs}\to \text{Insects}\to \text{Sun}\] done
clear
B)
\[\text{Sun}\to \text{Grass}\to \text{Insects}\to \text{Frogs}\] done
clear
C)
\[\text{Frogs}\to \text{Insects}\to \text{Grass}\to \text{Sun}\] done
clear
D)
\[\text{Insects}\to \text{Frogs}\to \text{Sun}\to \text{Grass}\] done
clear
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question_answer25)
What happens to the energy that leaves decomposers?
A)
It is lost as heat. done
clear
B)
It is reflected from the surface of the plants. done
clear
C)
It is stored as carbohydrates. done
clear
D)
It is used to power industrial processes. done
clear
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question_answer26)
Which of the following represents the labelled parts M and N?
A)
M-primary consumer, N-tertiary consumer done
clear
B)
M-tertiary consumer, N-producer done
clear
C)
M-decomposer, N-secondary consumer done
clear
D)
M-secondary consumer, N-primary and secondary consumer done
clear
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question_answer27)
Which of the following steps are used to treat industrial wastes and reduce pollution?
(i) Recycle the wastes |
(ii) Discharge the wastes into the sea |
(iii) Treat and neutralise harmful chemicals in the wastes |
A)
Only (i) and (iii) done
clear
B)
Only (i) and (ii) done
clear
C)
Only (ii) and (iii) done
clear
D)
All the three done
clear
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question_answer28)
Which of the labelled arrows represents the smallest amount of energy transferred between organisms and the largest amount of energy lost to the ecosystem?
A)
P and R done
clear
B)
P and S done
clear
C)
Q and R done
clear
D)
Q and S done
clear
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question_answer29)
Which of the following are ways of conserving and preserving Earth's natural resources?
A)
The recycling of wastes done
clear
B)
The using of alternative energy sources done
clear
C)
Reducing the use of fuels. done
clear
D)
All of these done
clear
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question_answer30)
Why is it difficult to degrade non-biodegradable wastes?
A)
Because non-biodegradable wastes cannot be recycled. done
clear
B)
Because microorganisms cannot decompose it. done
clear
C)
They can be made into organic wastes. done
clear
D)
All of the above done
clear
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question_answer31)
Which of the following diseases is caused due to the depletion of ozone layer?
A)
Throat cancer done
clear
B)
Skin cancer done
clear
C)
Blood cancer done
clear
D)
Oral cancer done
clear
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question_answer32)
In which of the following processes do harmful chemicals pass from one level to other and get accumulated in tertiary consumers?
A)
Bioremediation done
clear
B)
Biodegradation done
clear
C)
Biomagnifications done
clear
D)
Bioaccumulation done
clear
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question_answer33)
Which of the following is not due to man's activities?
A)
Volcanic eruption done
clear
B)
Global warming done
clear
C)
Thinning of the ozone layer done
clear
D)
Pollution of the environment done
clear
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question_answer34)
What is likely to happen if the number of frogs in the food chain given below decreases? \[Grass\to Grasshoper\to Frog\to Snake\]
A)
The population of snakes decreases done
clear
B)
The population of grasshoppers increases. done
clear
C)
The shortage of grass plants. done
clear
D)
All of these done
clear
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question_answer35)
Which of the following is an omnivore?
A)
Fungi done
clear
B)
Bacteria done
clear
C)
Crow done
clear
D)
Grasshopper done
clear
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question_answer36)
Which of the following will NOT cause an environmental pollution?
A)
Noise from vehicles done
clear
B)
Usage of chemical fertilizers done
clear
C)
Improper disposal of sewage done
clear
D)
Usage of a CFC free refrigerator done
clear
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question_answer37)
Which of the following pyramids given below correctly represents the food chain?
A)
B)
C)
D)
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question_answer38)
Which organism acts as both the secondary consumer and the tertiary consumer?
A)
Snake done
clear
B)
Hawk done
clear
C)
Chicken done
clear
D)
Rat done
clear
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question_answer39)
Which of the following is unlikely to be a consequence of global warming?
A)
Diseases of temperate countries which spread to tropical countries. done
clear
B)
The earth's weather will become warmer. done
clear
C)
Icebergs at the poles will melt faster. done
clear
D)
Low coastal areas become flooded. done
clear
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question_answer40)
Which of the following is NOT essential to maintain a balance in the ecosystem?
A)
Water cycle done
clear
B)
Carbon cycle done
clear
C)
Nitrogen cycle done
clear
D)
Deforestation done
clear
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