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Ecosystem

341 Questions Start Allen Test
All Exams Allen Errorless
Odisha JEE 2009 Q51 Errorless Ecosystem MCQ
Which most often limits the primary productivity of the ecosystem
A.
Solar radiation/light
B.
Oxygen
C.
Consumers
D.
Nitrogen
CBSE PMT 2009 Q52 Errorless Ecosystem MCQ
Which one of the following types of organisms occupy more than one trophic level in a pond ecosystem
A.
Phytoplankton
B.
Fish
C.
Zooplankton
D.
Frog
DUMET 2009 Q53 Errorless Ecosystem MCQ
In an aquatic ecosystem, the trophic level equivalent to cows in grassland is
A.
Phytopankton
B.
Zooplankton
C.
Nekton
D.
Benthos
Kerala PMT 2009 Q54 Errorless Ecosystem MCQ
Select the formula for ecological efficiency
A.
$\frac{\text{Gross primary productivity} \times 100}{\text{Incident total solar radiation}}$
B.
$\frac{\text{Food energy digested} \times 100}{\text{Food energy ingested}}$
C.
$\frac{\text{Net primary productivity} \times 100}{\text{Gross primary productivity}}$
D.
$\frac{\text{Energy in biomass production at a trophic level} \times 100}{\text{Energy in biomass production at previous trophic level}}$
E.
$\frac{\text{Volume of } CO_2 \text{ evolved}}{\text{Volume of } O_2 \text{ consumed}}$
WB JEE 2009 Q55 Errorless Ecosystem MCQ
Identify the correct type of food chain dead animal → blow fly maggots → common frog → snake
A.
Grazing food chain
B.
Detrital food chain
C.
Decomposer food chain
D.
Predator food chain
WB JEE 2009 Q56 Errorless Ecosystem MCQ
Which of the following is an example of man-made ecosystem
A.
Herbarium
B.
Aquarium
C.
Tissue culture
D.
Forest
AMU (Med.) 2009 Q57 Errorless Self Evaluation Test MCQ
A progressive series of changes in plant and animal life of an area from initial colonization is known as
A.
Evolution
B.
Succession
C.
Specialisation
D.
Selection
Odisha JEE 2008 Q58 Errorless Ecosystem MCQ
Which type of pyramid of energy is inverted
A.
Grass land
B.
Tree
C.
Both of these
D.
None of these
AFMC 2008, 09; Odisha JEE 2012 Q59 Errorless Ecosystem MCQ
Pyramid of energy in a pond ecosystem is always [NCERT Pg. No. 213]
A.
Inverted
B.
Upright
C.
Irregular
D.
Linear
CBSE PMT 2008 Q60 Errorless Ecosystem MCQ
Consider the following statements concerning food chains
(A) Removal of 80% tigers from a 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 vary from 2 to 8 trophic levels
A.
A, D
B.
A, B
C.
B, C
D.
C, B
WB JEE 2008 Q61 Errorless Ecosystem MCQ
Identify which one of the following is an e.g. of incomplete ecosystem Or Which of the following habitats is most unsuitable for primary productivity [MP PMT 1999]
A.
Grassland
B.
Cave
C.
River
D.
Wetland
Odisha JEE 2008 Q62 Errorless Self Evaluation Test MCQ
Which atom is limiting the primary productivity mostly
A.
C
B.
P
C.
D
D.
N
Odisha JEE 2008 Q63 Errorless Self Evaluation Test MCQ
Which of the following ecosystem has very little primary productivity
A.
Forest
B.
River
C.
Sea
D.
Grass Land
Odisha JEE 2008 Q64 Errorless Self Evaluation Test MCQ
An organism contains carbon molecules which have passed through three levels of ecosystem. The organism is a
A.
Primary consumer
B.
Tertiary consumer
C.
Predator
D.
Producer
AIIMS 2008 Q65 Errorless Assertion and Reason MCQ
Assertion : A network of food chains existing together in an ecosystem is known as a food web. Reason : An animal like kite cannot be a part of a food web.
A.
If both assertion and reason are true and the reason is the correct explanation of the assertion.
B.
If both assertion and reason are true but reason is not the correct explanation of the assertion.
C.
If assertion is true but reason is false.
D.
If the assertion and reason both are false.
E.
If assertion is false but reason is true.
Kerala PMT 2007 Q66 Errorless Ecosystem MCQ
In a pyramid of numbers, in a grassland ecosystem, the largest population is that of
A.
Producers
B.
Tertiary consumers
C.
Secondary consumers
D.
Primary consumers
E.
Herbivores
Kerala PMT 2007 Q67 Errorless Ecosystem MCQ
Which one of the following regarding ecological pyramid is not correct
A.
In most ecosystems, the pyramid of numbers and biomass are upright
B.
In tree-dominated ecosystem the pyramid of numbers is inverted
C.
The pyramid of energy expresses mainly the rate of food production
D.
In deep water ecosystem, the pyramid of biomass is upright
E.
The total energy flow at successive trophic level always decreases
MP PMT 2007 Q68 Errorless Self Evaluation Test MCQ
Phytoplanktons are
A.
Heterotrophs
B.
Autotrophs
C.
Saprotrophs
D.
All of these
MP PMT 2007; Odisha JEE 2010 Q69 Errorless Self Evaluation Test MCQ
Psammophytes are plants that grow where soil is
A.
Alkaline
B.
Sandy
C.
Acidic
D.
Alluvial
AFMC 2006 Q70 Errorless Ecosystem MCQ
Food chain is a series of population which starts with producers. Its is concerned with
A.
Biotic components only
B.
Energy flow and transfer of nutrients
C.
Both
D.
Biotic and decomposers
DPMT 2006 Q71 Errorless Ecosystem MCQ
Which is an example of true pyramid in an ecosystem Or The number of individuals at the trophic level decreases from the producer level to the consumer level in [J & K CET 2010]
A.
Pyramid of a biomass
B.
Pyramid of number
C.
Pyramid of energy
D.
None of the above
CBSE PMT 2006 Q72 Errorless Ecosystem MCQ
Which of the following is not used for construction of ecological pyramids
A.
Rate of energy flow
B.
Fresh weight
C.
Dry weight
D.
Number of individuals
AIIMS 2005 Q73 Errorless Ecosystem 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
RPMT 2005 Q74 Errorless Self Evaluation Test MCQ
A place was rocky and barren but now there is a green forest; the sequence of origin is
A.
Lichen, moss, herbs, shrubs
B.
Moss, lichen, herbs, shrubs
C.
Lichen, moss, shrubs, herbs
D.
Shrubs, herbs, moss, lichen
Kerala PMT 2004 Q75 Errorless Ecosystem MCQ
Energy flow and energy transformations in living systems strictly conform to the Or Flow of energy declines from low to higher trophic level in ecosystem, is mainly explained by [MP PMT 1999]
A.
Law of limiting factors
B.
Liebig's law of minimum
C.
Laws of thermodynamics (second)
D.
Shelford's law of tolerance
E.
Biogenetic law