Energy flow is an Ecosystem Chapter No 7 MCQ
Science and
Technology
Maharashtra State Board
Class: 9 MCQ
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1 |
Which
of the following is are incorrect? |
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|
1 |
All
ecosystems are constant in size |
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2 |
In
nature food chains exists, not food web |
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3 |
Flow
of energy in ecosystem is unidirectional |
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|
4 |
Gene
flow occurs between two different population |
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|
ANS |
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2 |
Which
of the following statement is incorrect? |
|
A |
Ecosystems
are exempted from the second law of thermodynamics |
|
B |
An
ecosystem has a tendency toward increasing disorderliness |
|
C |
Flow
of energy is unidirectional from the run to producers and then the consumers |
|
D |
All
organisms are dependent for their food on producers, either directly or in
directly |
|
ANS |
Ecosystems are exempted from the
second law of thermodynamics |
|
3 |
What
proportion of the (photosynthetically active radiation) is captured by
plants? |
|
A |
1-10
|
|
B |
2-10 |
|
C |
5-15 |
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D |
5-25 |
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ANS |
2-10 |
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4 |
What
do you mean by a food web? |
|
A |
Group
of food chains |
|
B |
Food
chains present in a particular area |
|
C |
Natural
inter connection of food chains |
|
D |
Food
chains formed by members of a genus |
|
ANS |
Natural inter connection of food
chains |
|
5 |
What
do secondary carnivores refer to? |
|
A |
Animals
at second trophic level |
|
B |
Those
animals that depends on the herbivores for food |
|
C |
Those
animals that depends on the primary carnivores for food |
|
D |
Those
animals that depends on the secondary herbivores for food |
|
ANS |
Those animals that depends on the
primary carnivores for food |
|
6 |
Most
food chains are composed of? |
|
A |
1
or 25 species |
|
B |
3
or 4 species |
|
C |
9
or 10 species |
|
D |
More
than 16 species |
|
ANS |
3 or 4 species |
|
7 |
Which
trophic level is in correctly defined? |
|
A |
Carnivores
– secondary or tertiary consumer |
|
B |
Decomposers
– microbial heterotrophs |
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C |
Herbivores
– primary consumer |
|
D |
Omnivores
– molds, yeast and mushrooms |
|
ANS |
Omnivores – molds, yeast and
mushrooms |
|
8 |
Why
does the number of trophic levels in the grazing food chain is restricted? |
|
A |
As
the transfer of energy follows 10 per cent law |
|
B |
So
that food chain remains short |
|
C |
As
there are few species the community |
|
D |
So
that transfer of energy could be more efficient |
|
ANS |
As the transfer of energy follows
10 per cent law |
|
9 |
The
second trophic level in a lake is? |
|
A |
Phytoplankton |
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B |
Zooplankton |
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C |
Benthos |
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D |
Fishes |
|
ANS |
Zooplankton |
|
10 |
Based
on the source of organism nutrition or food, they occupy a specific place in
the food chain that is known as? |
|
A |
Strata |
|
B |
Sere |
|
C |
Trophic
level |
|
D |
Chain
level |
|
ANS |
Trophic level |
|
11 |
What
does 10 per cent law say? |
|
A |
Only
10 per cent of the energy is transferred to each trophic level from the lower
trophic level |
|
B |
Only
10 per cent of the energy is assimilated from the eaten food |
|
C |
Consumer
gains 10 per cent mass of the consumed food |
|
D |
Less
than 10 per cent of the energy is transferred to each trophic level from the
lower trophic level |
|
ANS |
Only 10 per cent of the energy is
transferred to each trophic level from the lower trophic level |
|
12 |
Of
the total incident solar radiation, the proportion of PAR is? |
|
A |
About
60 |
|
B |
Less
than 50 |
|
C |
More
than 80 |
|
D |
Above
70 |
|
ANS |
Less than 50 |
|
13 |
Which
are the primary consumers in a grazing food chain? |
|
A |
Carnivores |
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B |
Omnivores |
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C |
Decomposers |
|
D |
Herbivores |
|
ANS |
Herbivores |
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14 |
Energy
flow in an ecosystem is? |
|
A |
Unidirectional |
|
B |
Bidirectional |
|
C |
Multi-directional |
|
D |
All
of these |
|
ANS |
Unidirectional |
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15 |
There
is always a loss of some energy as head during energy flows through an
ecosystem? |
|
A |
True |
|
B |
False |
|
ANS |
True |
|
16 |
How
many areas the energy that is received by organisms during energy transfer is
converted? |
|
A |
One |
|
B |
Two |
|
C |
Three |
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D |
Four |
|
ANS |
Three |
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17 |
Flow
of nutrients is…….? |
|
A |
Unidirectional |
|
B |
Rectangular |
|
C |
Cyclic |
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D |
Triangular |
|
ANS |
Cyclic |
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18 |
Which
form of sun energy is trapped by the producers in the energy flow? |
|
A |
Light
energy |
|
B |
Chemical
energy |
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C |
Wind
energy |
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D |
Pressure
energy |
|
ANS |
Light energy |
|
19 |
How
many percent of energy transferred from one tropic level to the next higher
level? |
|
A |
10 |
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B |
20 |
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C |
50 |
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D |
100 |
|
ANS |
10 |
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20 |
What
is called for an organism that eats both plants and animals? |
|
A |
Carnivores |
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B |
Omnivores |
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C |
Decomposers |
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D |
Herbivores |
|
ANS |
Omnivores |
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21 |
Why
energy flow is linear in an ecosystem? |
|
A |
Because
it flows in air medium |
|
B |
Because
it is very particular |
|
C |
Because
ecosystem is linear |
|
D |
Because
energy flows from one trophic level to the next higher one |
|
ANS |
Because energy flows from one
trophic level to the next higher one |
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22 |
Which
among the following is a product of photosynthesis? |
|
A |
Glucose |
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B |
Carbon |
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C |
Monoxide |
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D |
Nitrogen |
|
ANS |
Glucose |
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23 |
What
are called for an organisms which get energy by eating dead organisms? |
|
A |
Decomposers |
|
B |
Producers |
|
C |
Consumers |
|
D |
Herbivores |
|
ANS |
Decomposers |
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24 |
What
is called for the process of breaking down food to yield energy? |
|
A |
Oxidation |
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B |
Photosynthesis |
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C |
Cellular
respiration |
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D |
Decomposition |
|
ANS |
Cellular respiration |
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25 |
Identify
the odd one out? |
|
A |
Cockroach |
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B |
Crow |
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C |
Humans |
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D |
Goat |
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ANS |
Goat |
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