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Ecosystem

203 Questions Start Errorless Test
All Exams Allen Errorless
MP PMT 2012 Q26 Errorless 1. Ecosystem MCQ
The pyramid of numbers of a parasitic food chain in a forest ecosystem is
A.
Always inverted
B.
Always upright
C.
Mixture of inverted and upright
D.
Sometimes inverted and sometime upright
Kerala PMT 2012 Q27 Errorless 1. Ecosystem MCQ
In a particular climatic condition, decomposition rate is slower if
A.
Detritus is rich in nitrogen
B.
Detritus is rich in humus
C.
Detritus is rich in sugars
D.
Detritus is rich in lignin and chitin
E.
Detritus is rich in water soluble substances
Kerala PMT 2012 Q28 Errorless 1. Ecosystem MCQ
An inverted pyramid of number and an inverted pyramid of biomass are respectively seen in
A.
Grassland and tree ecosystem
B.
Sea and tree ecosystem
C.
Tree and sea ecosystem
D.
Sea and grassland ecosystem
E.
Tree and grassland ecosystem
AMU (Med.) 2012 Q29 Errorless 1. Ecosystem MCQ
In a pyramid of biomass, if the total dry weight $(kg / m^2)$ of primary producers is about 809 it will decrease at tertiary consumer level upto
A.
$37\mathrm{kg} / \mathrm{m}^2$
B.
$11\mathrm{kg} / \mathrm{m}^2$
C.
$5\mathrm{kg} / \mathrm{m}^2$
D.
$1.5\mathrm{kg} / \mathrm{m}^2$
J & K CET 2012 Q30 Errorless 1. Ecosystem MCQ
Which of the following has the largest population in a food chain
A.
Producers
B.
Primary consumers
C.
Secondary consumers
D.
Decomposers
BHU 2012; KCET 2018 Q31 Errorless 1. Ecosystem MCQ
Which of the following relations is correct regarding GPP and NPP of an ecosystem
A.
NPP=GPP - Animal consumption
B.
NPP=GPP + Plant respiration
C.
NPP=GPP - Plant respiration
D.
NPP=GPP + Animal consumption
CBSE PMT (Pre.) 2012 Q32 Errorless 1. Ecosystem MCQ
The upright pyramid of number is absent in
A.
Pond
B.
Forest
C.
Lake
D.
Grassland
CBSE PMT (Pre.) 2012; KCET 2018 Q33 Errorless 1. Ecosystem MCQ
Which one of the following is not a functional unit of an ecosystem
A.
Energy flow
B.
Decomposition
C.
Productivity
D.
Stratification/Pollution
NCERT; CBSE PMT (Pre.) 2012 Q34 Errorless 1. Ecosystem 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 PC is “insects” and level SC is “small insectivorous birds”
B.
Level PP is “phytoplanktons” in sea and “Whale” on top level TC
C.
Level one PP is “pipal trees” and the level SC is “sheep”
D.
Level PC is "rats" and level SC is "cats"
CBSE PMT (Pre.) 2012 Q35 Errorless 1. Ecosystem MCQ
Identify the possible link “A” in the following food chain: Plant → insect – frog → “A” → Eagle
A.
Rabbit
B.
Wolf
C.
Cobra
D.
Parrot
BHU 2012 Q36 Errorless 1. Ecosystem MCQ
Which of the following cannot be recycled in an ecosystem
A.
Nitrogen
B.
Oxygen
C.
Energy
D.
Water
AMU (Med.) 2012 Q37 Errorless 3. Critical Thinking MCQ
The important steps in the process of decomposition are
A.
Fragmentation and mineralization
B.
Leaching and catabolism
C.
Humification and mineralization
D.
All of these
CBSE PMT (Pre.) 2011 Q38 Errorless 1. Ecosystem MCQ
Which one of the following statement for pyramid of energy is incorrect, whereas the remaining three are correct
A.
It is upright in shape
B.
Its base is broad
C.
It shows energy content of different trophic level organisms
D.
It is inverted in shape
CBSE PMT (Pre.) 2011 Q39 Errorless 1. Ecosystem MCQ
Of the total incident solar radiation the proportion of PAR is [NCERT Pg. No. 209]
A.
More than 80%
B.
About 70%
C.
About 60%
D.
Less then 50%
Kerala PMT 2011 Q40 Errorless 1. Ecosystem MCQ
Which of the following statements regarding food chain is false
A.
In an aquatic ecosystem, grazing food chain is the major conduct for energy flow
B.
In terrestrial ecosystems, a large fraction of energy flows through detritus food chain
C.
The detritus food chain begins with dead organic matter
D.
Primary consumers belong to the first trophic level
E.
Animals like cockroaches and crows are omnivores
Kerala PMT 2011 Q41 Errorless 1. Ecosystem MCQ
In a grazing food chain carnivores may also be referred to as
A.
Primary producers
B.
Secondary producers
C.
Primary consumers
D.
Secondary consumers
E.
Decomposers
CBSE PMT (Mains) 2011 Q42 Errorless 3. Critical Thinking MCQ
Which one of the following animals may occupy more than one trophic levels in the same ecosystem at the same time
A.
Goat
B.
Frog
C.
Sparrow
D.
Lion
Kerala PMT 2010 Q43 Errorless 1. Ecosystem MCQ
Which of the following statement regarding decomposition is false
A.
Warm and moist environment favours decomposition
B.
Decomposition rate is slower if detritus is rich in chitin and lignin
C.
Earthworm is a detritivore
D.
Precipitation of soluble inorganic nutrients into the soil horizon as unavailable salt is called mineralisation
E.
Detritus is the raw material for decomposition
Kerala PMT 2010 Q44 Errorless 1. Ecosystem MCQ
Which of the following is false
A.
Quantity of biomass in a trophic level at a particular period is called as standing crop
B.
The energy content in a trophic level is determined by considering a few individuals of a species in that trophic level
C.
The succession that occurs in newly cooled lava is called primary succession
D.
Rate of succession is faster in secondary succession
E.
Phytoplanktons are the pioneers in the aquatic ecosystem
CBSE PMT (Mains) 2010 Q45 Errorless 1. Ecosystem MCQ
Identify the likely organisms (1), (2), (3) and (4) in the food web shown below
A.
1-Deer, 2-Rabbit, 3-Frog, 4-Rat
B.
1-Dog, 2-Squirrel, 3-Bat, 4-Deer
C.
1-Rat, 2-Dog, 3-Tortoise, 4-Crow
D.
1-Squirrel, 2-Cat, 3-Rat, 4-Pigeon
CBSE PMT (Mains) 2010 Q46 Errorless 1. Ecosystem MCQ
Which of the following representations shows the pyramid of numbers in a forest ecosystem
(A)

(B)

(C)

(D)
A.
D
B.
A
C.
B
D.
C
CBSE PMT (Pre.) 2010 Q47 Errorless 1. Ecosystem MCQ
Study the four statements $(A-D)$ given below and select the two correct ones out of them
(A) A lion eating a deer and a sparrow feeding on grain are ecologically similar in being consumers
(B) Predator star fish Pisaster helps in maintaining species diversity of some invertebrates
(C) Predators ultimately lead to the extinction of prey species
(D) Production of chemicals such as nicotine, strychnine by the plants are metabolic disorders
A.
A and B
B.
B and C
C.
C and D
D.
A and D
CBSE PMT (Pre.) 2010; Kerala PMT 2012 Q48 Errorless 1. Ecosystem MCQ
The biomass available for consumption by the herbivores and the decomposers is called
A.
Gross primary productivity
B.
Net primary productivity
C.
Secondary productivity
D.
Standing crop
AIIMS 2010 Q49 Errorless 1. Ecosystem MCQ
In a stable ecosystem, which of the following limits the number of trophic levels
A.
Biomass
B.
The number of nutrients
C.
Availability of nutrients
D.
Presence of contaminants that increase in concentration along the food chain
AIIMS 2010 Q50 Errorless 5. Assertion and Reason MCQ
Assertion : The rate of decomposition of detritus is reduced in the regions of high altitude. Reason : It happens due to immobilisation of nutrients
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.