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Ecosystem

341 Questions Start Allen Test
All Exams Allen Errorless
Q326 Errorless 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
Q327 Errorless 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
Q328 Errorless NCERT Exemplar Questions MCQ
Edaphic factor refers to
A.
Water
B.
Soil
C.
Relative humidity
D.
Altitude
Q329 Errorless NCERT Exemplar Questions MCQ
Which of the following is not a producer [NCERT]
A.
Spirogyra
B.
Agaricus
C.
Volvox
D.
Nostoc
Q330 Errorless 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
Q331 Errorless 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
Q332 Errorless 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.
$50\%$
Q333 Errorless 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
Q334 Errorless 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%
Q335 Errorless 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
Q336 Errorless 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
Q337 Errorless 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
Q338 Errorless 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
Q339 Errorless Critical Thinking MCQ
The figure shows a pyramid of energy which represents energy loss from a food chain to decomposers, upward transfer of energy to the next trophic level and energy loss through respiration. All diagram are in $kKm^{-2}Y^{-1}$ What is illustrated from this figure
A.
The energy of the final trophic level is not used
B.
Food chain efficiency is about $10\%$
C.
Energy loss to decomposers is higher than respiratory loss
D.
A pyramid of energy shows the nutrient transfer less clearly than a pyramid of numbers
Q340 Errorless Critical Thinking MCQ
The second trophic level of longer food chains in a lake is
A.
Phytoplankton
B.
Zooplankton
C.
Benthos
D.
Fishes
Q341 Errorless Critical Thinking MCQ
The figure given below represents the flow of materials between trophic levels. Which arrow is not correct
A.
IV
B.
III
C.
II
D.
I