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Ecosystem

341 Questions Start Allen Test
All Exams Allen Errorless
Q276 Allen PYQ MCQ
Identify the correct statements:
(A) Detrivores perform fragmentation.
(B) The humus is further degraded by some microbes during mineralization.
(C) Water soluble inorganic nutrients go down into the soil and get precipitated by a process called leaching.
(D) The detritus food chain begins with living organisms.
(E) Earthworms break down detritus into smaller particles by a process called catabolism.
A.
B, C, D only
B.
C, D, E only
C.
D, E, A only
D.
A, B, C only
Q277 Allen PYQ MCQ
In the equation GPP - R = NPP GPP is Gross Primary Productivity NPP is Net Primary Productivity R here is _.
A.
Respiratory quotient
B.
Respiratory loss
C.
Reproductive allocation
D.
Photosynthetically active radiation
Q278 Allen PYQ MCQ
The amount of nutrients such as carbon, nitrogen, potassium and calcium present in the soil at any given time is referred to as :
A.
Standing state
B.
Standing crop
C.
Humus
D.
Detritus
Q279 Allen PYQ MCQ
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : A person goes to high altitude and experiences "Altitude Sickness" with symptoms like breathing difficulty and heart palpitations.
Reason (R) : Due to low atmospheric pressure at high altitude, the body does not get sufficient oxygen.
In the light of the above statements,
choose the correct answer from the options given below :
A.
(A) is true but (R) is false
B.
(A) is false but (R) is true
C.
Both (A) and (R) are true and (R) is the correct explanation of (A).
D.
Both (A) and (R) are true but (R) is not the correct explanation of (A).
Q280 Allen PYQ MCQ
In an ecosystem if the Net Primary Productivity (NPP) of first trophic level is $100 \times (kcal m^{-2}) yr^{-1}$ , what would be the GPP (Gross Primary Productivity) of the third trophic level of the same ecosystem?
A.
$\frac{X}{10} (kcalm^{-2})yr^{-1}$
B.
$x(kcal m^{-2})yr^{-1}$
C.
$10x(kcal\ m^{-2})yr^{-1}$
D.
$\frac{100x}{3x} (kcalm^{-2})yr^{-1}$
Q281 Allen PYQ MCQ
Consider the pyramid of energy of an ecosystem given below: If $T_{4}$ is equivalent to 1000J, what is the value at $T_{1}$ .
A.
$\frac{10000}{10}\mathrm{J}$
B.
$\frac{10000}{10} \times 4\mathrm{J}$
C.
10,000 J
D.
10,00,000 J
Q282 Allen NCERT BASED QUESTIONS MCQ
Adaptation to low temperature and freezing in animals occurs due to the production of :-
A.
Antifreeze proteins
B.
Chaperonins
C.
Proline
D.
Analine
Q283 Allen NCERT BASED QUESTIONS MCQ
Which one of the following has the largest population in a food chain?
A.
Producers
B.
Primary consumers
C.
Secondary consumers
D.
Decomposers
Q284 Allen NCERT BASED QUESTIONS MCQ
The second trophic level in a lake is :-
A.
Phytoplankons
B.
Zooplanktons
C.
Benthos
D.
Fishes
Q285 Allen NCERT BASED QUESTIONS MCQ
Secondary producers are :-
A.
Herbivores
B.
Producers
C.
Carnivores
D.
None of the above
Q286 Allen NCERT BASED QUESTIONS MCQ
What is the percentage of photosynthetically active radiation (PAR) in the incident solar radiations?
A.
100 %
B.
50 %
C.
1ā€“5 %
D.
2 ā€“ 10 %
Q287 Allen NCERT BASED QUESTIONS MCQ
Which of the following is an abiotic components of the ecosystem?
A.
Bacteria
B.
Humus
C.
Plants
D.
Fungi
Q288 Allen NCERT BASED QUESTIONS MCQ
Which of the following processes helps in Nutrient conservation?
A.
Mineralisation
B.
Immobilisation
C.
Leaching
D.
Nitrification
Q289 Allen NCERT BASED QUESTIONS MCQ
Which of the following represents the sedimentary type of nutrient cycle?
A.
Sulphur
B.
Phosphorus
C.
Nitrogen
D.
Oxygen
Q290 Allen NCERT BASED QUESTIONS MCQ
Photosynthetically active radiation (PAR) represents the following range of wave length.
A.
400 ā€“ 700 nm
B.
500 ā€“ 600 nm
C.
450 ā€“ 950 nm
D.
340 ā€“ 450 nm
Q291 Allen NCERT BASED QUESTIONS MCQ
The detritus food chain (DFC) begins with :
A.
Producers
B.
Grasses
C.
Dead organic matter
D.
Humus
Q292 Allen NCERT BASED QUESTIONS MCQ
Rate of capture of solar energy or total production of organic matter is called as-
A.
Gross primary productivity
B.
Gross secondary productivity
C.
Net primary productivity
D.
Secondary productivity
Q293 Allen NCERT BASED QUESTIONS MCQ
A sparrow is a ____ consumer when it eats seeds, fruits, peas, and a ____ consumer when it eats insects and worms.
A.
Secondary, Primary
B.
Primary, Secondary
C.
Tertiary, Secondar
D.
Primary, Tertiary
Q294 Allen ANALYTICAL QUESTIONS MCQ
Total amount of energy trapped by green plants in food is called :-
A.
Gross primary production
B.
Net primary production
C.
Standing crop
D.
Standing state
Q295 Allen ANALYTICAL QUESTIONS MCQ
Bacteria are essential in carbon cycle as :-
A.
Decomposer
B.
Synthesizer
C.
Consumer
D.
Pri. Producer
Q296 Allen ANALYTICAL QUESTIONS MCQ
In which biome a new plant may adapt soon:-
A.
Tropical rain forest
B.
Desert
C.
Mangrove
D.
Sea island
Q297 Allen ANALYTICAL QUESTIONS MCQ
Concentration of DDT is highest in :-
A.
Primary consumer
B.
Producers
C.
Top consumer
D.
Decomposers
Q298 Allen ANALYTICAL QUESTIONS MCQ
Percentage energy transferred to higher trophic level in food chain is :-
A.
1%
B.
10%
C.
90%
D.
100%
Q299 Allen ANALYTICAL QUESTIONS MCQ
Biotic and abiotic components form :-
A.
Community
B.
Ecosystem
C.
Population
D.
Species
Q300 Allen ANALYTICAL QUESTIONS MCQ
Species diversity is maximum in :-
A.
Tropical rain forest
B.
Temperate forest
C.
Deserts
D.
Hill slops