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Ecosystem

341 Questions Start Allen Test
All Exams Allen Errorless
Q301 Allen ANALYTICAL QUESTIONS MCQ
Insectivorous plants grow in the soil which is deficient in :-
A.
Mg
B.
Ca
C.
P
D.
N
Q302 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
Q303 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
Q304 Allen ANALYTICAL QUESTIONS MCQ
In which of the following plant sunken stomata are found :-
A.
Nerium
B.
Hydrilla
C.
Mango
D.
Guava
Q305 Allen ANALYTICAL QUESTIONS MCQ
An ecosystem which can be easily damaged but can recover after some time if damaging effect stops will having :-
A.
High stability and low resilience
B.
Low stability and low resilience
C.
High stability and high resilience
D.
Low stability and high resilience
Q306 Allen ANALYTICAL QUESTIONS MCQ
In which one of the following habitats does the diurnal temperature of soil surface vary most?
A.
Forest
B.
Desert
C.
Grassland
D.
Shrub land
Q307 Allen ANALYTICAL QUESTIONS MCQ
Which of the following is not true for a species?
A.
Members of a species can interbreed
B.
Gene flow does not occur between the populations of a species
C.
Each species is reproductively isolated from every other species
D.
Variations occur among members of a species
Q308 Allen ANALYTICAL QUESTIONS MCQ
Given below is one of the types of ecological pyramids. This type represents
A.
Pyramid of numbers in a grassland
B.
Pyramid of biomass in a fallow land
C.
Pyramid of biomass in a lake
D.
Energy pyramid in a spring
Q309 Allen ANALYTICAL QUESTIONS MCQ
Consider the following statements concerning food chains :-
(a) Removal of 80% tigers from an area resulted in greatly increased growth of vegetation.
(b) Removal of most of the carnivores resulted in an increased population of deers.
(c) The length of food chains is generally limited to 3-4 trophic levels due to energy loss.
(d) The length of food chains may very from 2 to 8 trophic levels.
Which two of the above statements are correct?
A.
a, d
B.
a, b
C.
b, c
D.
c, d
Q310 Allen ANALYTICAL QUESTIONS MCQ
Which of the following representations shows the pyramid of numbers in a forest ecosystem: - image.png
A.
A
B.
B
C.
C
D.
D
Q311 Allen ANALYTICAL QUESTIONS MCQ
Which one of the following statements for pyramid of energy is incorrect, whereas the remaining three are correct?
A.
Its base is broad
B.
It shows energy content of different trophic level organisms
C.
It is inverted in shape
D.
It is upright in shape
Q312 Allen ANALYTICAL QUESTIONS MCQ
The upright pyramid of number is absent in
A.
Lake
B.
Grassland
C.
Pond
D.
Forest
Q313 Allen ANALYTICAL QUESTIONS MCQ
Given below is an imaginary pyramid of numbers. What could be one of the possibilities about certain organisms at some of the different levels?
A.
Level one PP is "Pipal trees" and the level SC is "sheep"
B.
Level PC is "rats" and level SC is "cats"
C.
Level PC is "insects" and level SC is "small insectivorous birds
D.
Level PP is "Phytoplanktons" in sea and "Whale" on top level TC.
Q314 Allen ANALYTICAL QUESTIONS MCQ
Identify the likely organisms (a), (b), (c) and (d) in the food web shown below :-
A.
rat, dog, tortoise, crow
B.
squirrel, cat, rat, pigeon
C.
deer, rabbit, frog, rat
D.
dog, squirrel, bat, deer
Q315 Allen ANALYTICAL QUESTIONS MCQ
The rate of formation of new organic matter by rabbit in a grassland, is called :-
A.
Net primary productivity
B.
Gross primary productivity
C.
Net productivity
D.
Secondary productivity
Q316 Allen ANALYTICAL QUESTIONS MCQ
Which one of the following processes during decomposition is correctly described?
A.
Leaching ā€” Water soluble inorganic nutrients rise to the top layers of soil
B.
Fragmentation ā€” Carried out by organisms such as earthworm
C.
Humification ā€” Leads to the accumulation of a dark coloured substance humus which undergoes microbial action at a very fast rate
D.
Catabolism ā€” Last step in the decomposition under fully anaerobic condition
Q317 Errorless 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
Q318 Errorless 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
Q319 Errorless 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)
Q320 Errorless 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
Q321 Errorless 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
Q322 Errorless 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
Q323 Errorless 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
Q324 Errorless 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
Q325 Errorless 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