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Ecosystem

138 Questions Start Allen Test
All Exams Allen
Q76 Allen PYQ MCQ
Given below is a simplified model of phosphorus cycling in a terrestrial ecosystem with four blanks (A-D). Identify the blanks :-

(a) Rock minerals
(b) Detritus
(c) Litter fall
(d) Producers
A.
Rock minerals
B.
Litter fall
C.
Producers
D.
Detritus
Q77 Allen PYQ MCQ
If 20 J of energy is trapped at producer level, then how much energy will be available to peacock as food in the following chain? plant ā†’ mice ā†’ snake ā†’ peacock
A.
0.02 J
B.
0.002 J
C.
0.2 J
D.
0.0002 J
Q78 Allen PYQ MCQ
The mass of living material at a trophic level at a particular time is called :-
A.
Standing state
B.
Net primary productivity
C.
Standing crop
D.
Gross primary productivity
Q79 Allen PYQ MCQ
In an ecosystem the rate of production of organic matter during photosynthesis is termed as :-
A.
Gross primary productivity
B.
Secondary productivity
C.
Net productivity
D.
Net primary productivity
Q80 Allen PYQ MCQ
Secondary Succession takes place on/in :-
A.
Degraded forest
B.
Newly created pond
C.
Newly cooled lava
D.
Bare rock
Q81 Allen PYQ MCQ
In which of the following both pairs have corrected combination?
A.
Gaseous nutrient cycle ā€“ Sulphur and Phosphorus; Sedimentary nutrient cycle ā€“ Carbon and Nitrogen
B.
Gaseous nutrient cycle ā€“ Carbon and Nitrogen; Sedimentary nutrient cycle ā€“ Sulphur and Phosphorus
C.
Gaseous nutrient cycle ā€“ Carbon and Sulphur; Sedimentary nutrient cycle ā€“ Nitrogen and Phosphorus
D.
Gaseous nutrient cycle ā€“ Nitrogen and Sulphur; Sedimentary nutrient cycle ā€“ Carbon and Phosphorus
Q82 Allen PYQ MCQ
During ecological succession :-
A.
The changes lead to a community that is in near equilibrium with the environment and is called pioneer community
B.
The gradual and predictable change in species composition occurs in a given area
C.
The establishment of a new biotic community is very fast in its primary phase
D.
The numbers and types of animals remain constant
Q83 Allen PYQ MCQ
The term ecosystem was coined by :-
A.
E. P. Odum
B.
A. G. Tansley
C.
E. Haeckel
D.
E. Warming
Q84 Allen PYQ MCQ
The primary producers of the deep-sea hydrothermal vent ecosystem are :-
A.
Blue-green algae
B.
Coral reefs
C.
Green algae
D.
Chemosynthetic bacteria
Q85 Allen PYQ MCQ
Which ecosystem has the maximum biomass?
A.
Grassland ecosystem
B.
Pond ecosystem
C.
Lake ecosystem
D.
Forest ecosystem
Q86 Allen PYQ MCQ
The sequential events from initial stage till climax stage in a succession are called :-
A.
Ecesis
B.
Sere
C.
Nudation
D.
Migration
Q87 Allen PYQ MCQ
Which of the following ecological pyramids is generally inverted?
A.
Pyramid of numbers in grassland
B.
Pyramid of energy
C.
Pyramid of biomass in a forest
D.
Pyramid of biomass in a sea
Q88 Allen PYQ MCQ
Which of the following statements is incorrect?
A.
Biomass decreases from first to fourth trophic level
B.
Energy content gradually increases from first to fourth trophic level
C.
Number of individuals decreases from first trophic level to fourth trophic level
D.
Energy content gradually decreases from first to fourth trophic level
Q89 Allen PYQ MCQ
The rate decomposition is faster in the ecosystem due to following factors EXCEPT
A.
Detritus rich in sugars
B.
Warm and moist environment
C.
Presence of aerobic soil microbes
D.
Detritus richer in lignin and chitin
Q90 Allen PYQ MCQ
In relation of Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct?
A.
There is no relationship between Gross primary productivity and Net primary productivity.
B.
Gross primary productivity is always less than net primary productivity.
C.
Gross primary productivity is always more than net primary productivity.
D.
Gross primary productivity and Net primary productivity are one and same.
Q91 Allen PYQ MCQ
The amount of nutrients, such as carbon, nitrogen, phosphorus and calcium present in the soil at any given time, is referred as
A.
Climax
B.
Climax community
C.
Standing state (4) Standing crop
Q92 Allen PYQ MCQ
Which of the following statements is not correct?
A.
Pyramid of biomass in sea is generally inverted.
B.
Pyramid of biomass in sea is generally upright.
C.
Pyramid of energy is always upright.
D.
Pyramid of numbers in a grassland ecosystem is upright.
Q93 Allen PYQ MCQ
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.
Both (A) and (R) are true and (R) is the correct explanation of (A)
B.
Both (A) and (R) are true but (R) is not the correct explanation of (A)
C.
(A) is true but (R) is false
D.
(A) is false but (R) is true
Q94 Allen PYQ MCQ
In the equation GPP - R = NPPR represents :-
A.
Radiant energy
B.
Retardation factor
C.
Environment factor
D.
Respiration losses
Q95 Allen PYQ MCQ
The amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis is called:
A.
Secondary production
B.
Primary production
C.
Gross primary production
D.
Net primary production
Q96 Allen PYQ MCQ
Which one of the following will accelerate phosphorus cycle?
A.
Volcanic activity
B.
Weathering of rocks
C.
Rain fall and storms
D.
Burning of fossil fuels
Q97 Allen PYQ Match the Columns
Match the column-I with column-II
Column-IColumn-II
(a)Carbon dissolved in oceans
(b)Annual fixation of carbon through photosynthesis
(c)PAR captured by plants
(d)Productivity of oceans
(i)55 billion tons
(ii)71%
(iii)4 Ɨ 10Ā¹Ā³ kg
(iv)2 to 10%
A.
(a) - (ii), (b) - (iv), (c) - (iii), (d) - (i)
B.
(a) - (iii), (b) - (iv), (c) - (ii), (d) - (i)
C.
(a) - (ii), (b) - (iii), (c) - (iv), (d) - (i)
D.
(a) - (iii), (b) - (ii), (c) - (i), (d) - (iv)
Q98 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
Q99 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
Q100 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