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Ecosystem

203 Questions Start Errorless Test
All Exams Allen Errorless
MP PMT 1993 Q176 Errorless 1. Ecosystem MCQ
In forest ecosystem, pyramid of number is
A.
Upright
B.
Inverted
C.
Any of the two
D.
None of the above
RPMT 1992 Q177 Errorless 1. Ecosystem MCQ
What is maximum in a pond-ecosystem
A.
Primary consumers
B.
Secondary consumers
C.
Producers
D.
Decomposers
CBSE PMT 1991 Q178 Errorless 1. Ecosystem MCQ
Which of the following is correct sequence in food chain
A.
Fallen leaves ā†’ bacteria ā†’ insect larvae ā†’ birds
B.
Phytoplankton ā†’ zooplankton ā†’ fish
C.
Grasses ā†’ fox ā†’ rabbit
D.
Grasses ā†’ chameleon ā†’ insects ā†’ birds
Q179 Errorless 1. Ecosystem MCQ
The figure given below shows a particular food web. Each alphabet represents a different species. Arrows indicate the flow of energy and materials. Which of the following would probably have the greatest total biomass [NCERT]
A.
K+M
B.
K
C.
J+G
D.
F
Q180 Errorless 1. Ecosystem MCQ
The figure given below shows estimated values for carbon fixation in a terrestrial ecosystem. Diagram refer to tones $\times 10^{9}$ , fixed or available for fixation Which result can be drawn from the figure
A.
There is a net loss to the decomposers
B.
There is a net loss to the atmosphere
C.
The system is in balance
D.
There is an net gain to the producers
Q181 Errorless 1. Ecosystem Numerical
Two food chains are given below
Tree ā†’ aphid ā†’ insectivorous bird ā†’ bird of prey.
Phytoplankton ā†’ zooplankton ā†’ plankton - feeding fish ā†’ carnivorous fish.
Which diagram is a pyramid of energy, representing both
Which diagram is a pyramid of energy representing both food chains
(a)

(b)

(C)

(d)
Q182 Errorless 1. Ecosystem MCQ
Using the figure, determine which animals would be found in the same trophic level [NCERT]
A. Trophic level
(A) Trophic level - 4, Feeding strategy - Secondary carnivore, Grazing food chain - Cooperā€™s hawk, Decomposer food chain - Owl
(B) Trophic level - 3, Feeding strategy - Carnivore, Grazing food chain - Robin, Decomposer food chain - Shrew
(C) Trophic level - 2, Feeding strategy - Herbivore, Grazing food chain - Cricket, Decomposer food chain - Earthworm
(D) Trophic level - 1, Feeding strategy - Autotroph, Grazing food chain - Maple tree leaves, Decomposer food chain - Dead maple leaves
B. Pyramid of productivity
A.
Humans and horses
B.
Eagles and blue jays
C.
Pine trees and garden snakes
D.
Crickets and cows
Q183 Errorless 1. Ecosystem MCQ
The following figure is best example of
A.
Pyramid of number in forest ecosystem
B.
Pyramid of number in grassland ecosystem
C.
Pyramid of biomass in forest ecosystem
D.
Pyramid of number in parasitic food chain
Q184 Errorless 1. Ecosystem MCQ
In an ecosystem, the population of [NCERT Pg. No. 209]
A.
Primary producers are more than that of primary consumers
B.
Secondary consumers are largest because they are powerful
C.
Primary consumers out number primary producers
D.
Primary consumers are least dependent upon primary producers
Q185 Errorless 1. Ecosystem MCQ
In the following simplified model of a nutrient cycle, identify A, B, C, D and E [NCERT] Rock minerals
A.
A ā€“ Producers, B ā€“ Soil solution, C ā€“ Detritus, D ā€“ Weathering, E ā€“ Decomposition
B.
A ā€“ Producers, B ā€“ Soil solution, C ā€“ Detritus, D ā€“ Decomposition, E ā€“ Weathering
C.
A ā€“ Producers, B ā€“ Detritus, C ā€“ Soil solution, D ā€“ Weathering, E ā€“ Decomposition
D.
A ā€“ Producers, B ā€“ Detritus, C ā€“ Soil solution, D ā€“ Decomposition, E ā€“ Weathering
Q186 Errorless 1. Ecosystem MCQ
The importance of ecosystem lies in
A.
Cycling of materials
B.
Flow of energy
C.
Both the above
D.
None of the above
Q187 Errorless 2. NCERT Exemplar Questions MCQ
Decomposers like fungi and bacteria are
(i) Autotrophs
(ii) Heterotrophs
(iii) Saprotrophs
(iv) Chemo-autotrophs
A.
i and iii
B.
i and iv
C.
ii and iii
D.
i and ii
Q188 Errorless 2. NCERT Exemplar Questions MCQ
The process of mineralization by microorganisms helps in the release of
A.
Inorganic nutrients from humus
B.
Both organic and inorganic nutrients from detritus
C.
Organic nutrients from humus
D.
Inorganic nutrients from detritus and formation of humus
Q189 Errorless 2. NCERT Exemplar Questions MCQ
Productivity is the rate of production of biomass expressed in term of
(i) $(kcal\ m^{-3})yr^{-1}$
(ii) $g^{-2}\ yr^{-1}$
(iii) $g^{-1}\ yr^{-1}$
(iv) $(kcal\ m^{-2})yr^{-1}$
A.
ii
B.
iii
C.
ii and iv
D.
i and iii
Q190 Errorless 2. NCERT Exemplar Questions MCQ
Edaphic factor refers to
A.
Water
B.
Soil
C.
Relative humidity
D.
Altitude
Q191 Errorless 2. NCERT Exemplar Questions MCQ
Which of the following is not a producer [NCERT]
A.
Spirogyra
B.
Agaricus
C.
Volvox
D.
Nostoc
Q192 Errorless 2. NCERT Exemplar Questions MCQ
Which of the following is an ecosystem service provided by a natural ecosystem?
A.
Cycling of nutrients
B.
Prevention of soil erosion
C.
Pollutant absorption and reduction of the threat of global warming
D.
All of the above
Q193 Errorless 2. NCERT Exemplar Questions MCQ
Pyramid of numbers is [NCERT]
A.
Always upright
B.
Always inverted
C.
Either upright or inverted
D.
Neither upright nor inverted
Q194 Errorless 2. NCERT Exemplar Questions MCQ
Approximately how much of the solar energy that falls on the leaves of a plants is converted to chemical energy by photosynthesis
A.
Less than $1\%$
B.
$2 - 10\%$
C.
$30\%$
D.
$50\%$
Q195 Errorless 2. NCERT Exemplar Questions MCQ
Among the following, where do you think the process of decomposition would be the fastest [NCERT]
A.
Tropical rain forest
B.
Antarctic
C.
Dry and region
D.
Alpine region
Q196 Errorless 2. NCERT Exemplar Questions MCQ
How much of the net primary productivity of a terrestrial ecosystem is eaten and digested by herbivores
A.
1%
B.
10%
C.
40%
D.
90%
Q197 Errorless 2. NCERT Exemplar Questions MCQ
If the carbon atoms fixed by producers already have passed through three species, the trophic level of the last species would be
A.
Scavenger
B.
Tertiary producer
C.
Tertiary consumer
D.
Secondary consumer
Q198 Errorless 2. NCERT Exemplar Questions MCQ
Which of the following type of ecosystem is expected in an area where evaporation exceeds precipitation and mean annual rainfall is below 100mm [NCERT]
A.
Grassland
B.
Shrubby forest
C.
Desert
D.
Mangrove
Q199 Errorless 2. NCERT Exemplar Questions MCQ
The zone at the edge of a lake or ocean which is alternatively exposed to air and immersed in water is called [NCERT]
A.
Pelagic zone
B.
Benthic zone
C.
Lentic zone
D.
Littoral zone
Q200 Errorless 3. Critical Thinking MCQ
If we completely remove the decomposers from an ecosystem, the ecosystem functioning will be adversely affected because
A.
Mineral movement will be blocked
B.
Herbivores will not receive solar energy
C.
Energy flow will be blocked
D.
Rate of decomposition of other components will be very high