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Ecosystem

138 Questions Start Allen Test
All Exams Allen
Q101 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).
Q102 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.
$\frac{100x}{3x} (kcalm^{-2})yr^{-1}$
Q103 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
Q104 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
Q105 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
Q106 Allen NCERT BASED QUESTIONS MCQ
The second trophic level in a lake is :-
A.
Phytoplankons
B.
Zooplanktons
C.
Benthos
D.
Fishes
Q107 Allen NCERT BASED QUESTIONS MCQ
Secondary producers are :-
A.
Herbivores
B.
Producers
C.
Carnivores
D.
None of the above
Q108 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 %
Q109 Allen NCERT BASED QUESTIONS MCQ
Which of the following is an abiotic components of the ecosystem?
A.
Bacteria
B.
Humus
C.
Plants
D.
Fungi
Q110 Allen NCERT BASED QUESTIONS MCQ
Which of the following processes helps in Nutrient conservation?
A.
Mineralisation
B.
Immobilisation
C.
Leaching
D.
Nitrification
Q111 Allen NCERT BASED QUESTIONS MCQ
Which of the following represents the sedimentary type of nutrient cycle?
A.
Sulphur
B.
Phosphorus
C.
Nitrogen
D.
Oxygen
Q112 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
Q113 Allen NCERT BASED QUESTIONS MCQ
The detritus food chain (DFC) begins with :
A.
Producers
B.
Grasses
C.
Dead organic matter
D.
Humus
Q114 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
Q115 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
Q116 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
Q117 Allen ANALYTICAL QUESTIONS MCQ
Bacteria are essential in carbon cycle as :-
A.
Decomposer
B.
Synthesizer
C.
Consumer
D.
Pri. Producer
Q118 Allen ANALYTICAL QUESTIONS MCQ
In which biome a new plant may adapt soon:-
A.
Tropical rain forest
B.
Desert
C.
Mangrove
D.
Sea island
Q119 Allen ANALYTICAL QUESTIONS MCQ
Concentration of DDT is highest in :-
A.
Primary consumer
B.
Producers
C.
Top consumer
D.
Decomposers
Q120 Allen ANALYTICAL QUESTIONS MCQ
Percentage energy transferred to higher trophic level in food chain is :-
A.
1%
B.
10%
C.
90%
D.
100%
Q121 Allen ANALYTICAL QUESTIONS MCQ
Biotic and abiotic components form :-
A.
Community
B.
Ecosystem
C.
Population
D.
Species
Q122 Allen ANALYTICAL QUESTIONS MCQ
Species diversity is maximum in :-
A.
Tropical rain forest
B.
Temperate forest
C.
Deserts
D.
Hill slops
Q123 Allen ANALYTICAL QUESTIONS MCQ
Insectivorous plants grow in the soil which is deficient in :-
A.
Mg
B.
Ca
C.
P
D.
N
Q124 Allen ANALYTICAL QUESTIONS MCQ
Which is the reason for highest biomass in aquatic ecosystem-
A.
Nano plankton, blue green algae, green algae
B.
Sea grass, and slime molds
C.
Benthonic and brown algae
D.
Diatoms
Q125 Allen ANALYTICAL QUESTIONS MCQ
Pneumatophores are found in-
A.
The vegetation which is found in marshy and saline lake
B.
The vegetation which found in saline soil
C.
Xerophytes
D.
Epiphytes