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Ecosystem

203 Questions Start Errorless Test
All Exams Allen Errorless
NEET 2024 Q1 Errorless 3. Critical Thinking MCQ
In an ecosystem if the Net Primary productivity (NPP) of first trophic level is $100x(kcal\ m^{-2})yr^{-1}$ , what would be the GPP (Gross Primary Productivity) of the third trophic level of the same ecosystem
A.
$\frac{x}{10}(kcal\ m^{-2})yr^{-1}$
B.
$x(kcal m^{-2})yr^{-1}$
C.
$10x(kcal m^{-2})yr^{-1}$
D.
$\frac{100x}{3x} (kcal m^{-2})yr^{-1}$
NEET 2023 Q2 Errorless 3. Critical Thinking 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
NEET 2023 Q3 Errorless 3. Critical Thinking MCQ
Given below are two statements Statement I : Gause's ā€˜Competitive Exclusion Principleā€™ states that two closely related species competing for the same resources cannot co-exist indefinitely and competitively inferior one will be eliminated eventually. Statement II : In general, carnivores are more adversely affected by competition than herbivores. In the light of the above statements, choose the correct answer from the options given below
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.
NEET 2023 Q4 Errorless 3. Critical Thinking MCQ
Which of the following statements is correct
A.
Biomagnification refers to increase in concentration of the toxicant at successive trophic levels
B.
Presence of large amount of nutrients in water restricts 'Algal Bloom'
C.
Algal Bloom decreases fish mortality
D.
Eutrophication refers to increase in domestic sewage and waste water in lakes
NEET 2022 Q5 Errorless 3. Critical Thinking MCQ
Given below are two statements Statement I : Decomposition is a process in which the detritus is degraded into simpler substances by microbes Statement II : Decomposition is faster if the detritus is rich in lignin and chitin In the light of the above statements, choose the correct answer from the options given below
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.
NEET 2022 Q6 Errorless 3. Critical Thinking MCQ
Detritivores breakdown detritus into smaller particles. This process is called
A.
Humification
B.
Decomposition
C.
Catabolism
D.
Fragmentation
NEET 2021 Q7 Errorless 3. Critical Thinking MCQ
Which of the following statements is not correct
A.
Pyramid of biomass in sea is generally upright
B.
Pyramid of energy is always upright
C.
Pyramid of numbers in a grassland ecosystem is upright
D.
Pyramid of biomass in sea is generally inverted
NEET 2021,23 Q8 Errorless 3. Critical Thinking 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
NEET 2020 Q9 Errorless 3. Critical Thinking MCQ
Match the trophic levels with their correct species examples in grassland ecosystem
Column-IColumn-II
(A)Four trophic level
(B)Second trophic level
(C)First trophic level
(D)Third trophic level
(P)Crow
(Q)Vulture
(R)Rabbit
(S)Grass
A.
Aā€“P, Bā€“Q, Cā€“R, Dā€“S
B.
Aā€“Q, Bā€“R, Cā€“S, Dā€“P
C.
Aā€“R, Bā€“Q, Cā€“S, Dā€“P
D.
Aā€“S, Bā€“R, Cā€“Q, Dā€“P
NEET 2020 Q10 Errorless 3. Critical Thinking MCQ
In relation to 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
NEET 2019 Q11 Errorless 3. Critical Thinking 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
NEET 2019 Q12 Errorless 3. Critical Thinking MCQ
Which of the statements given below is not true about formation of Annual Rings in trees
A.
Annual ring is a combination of spring wood and autumn wood produced in a year
B.
Differential activity of cambium causes light and dark bands of tissue ā€“ early and late wood respectively
C.
Activity of cambium depends upon variation in climate
D.
Annual rings are not prominent in trees of temperate region
NEET 2018 Q13 Errorless 1. Ecosystem MCQ
Which of the following organisms are known as chief producers in the oceans
A.
Dinoflagellates
B.
Diatoms
C.
Cyanobacteria
D.
Euglenoids
NEET 2018 Q14 Errorless 1. Ecosystem MCQ
What type of ecological pyramid would obtained with the following data Secondary consumer : 120 g Primary consumer : 60 g Primary producer : 10 g
A.
Inverted pyramid of biomass
B.
Pyramid of energy
C.
Upright pyramid of numbers
D.
Upright pyramid of biomass
NEET 2017 Q15 Errorless 1. Ecosystem MCQ
Which ecosystem has the maximum biomass
A.
Forest ecosystem
B.
Grassland ecosystem
C.
Pond ecosystem
D.
Lake ecosystem
WB-JEE 2016 Q16 Errorless 1. Ecosystem MCQ
'Edge effect' is observed in case of
A.
Ecozone
B.
Ecotone
C.
Biotope
D.
Ecosphere
NEET (Phase-II) 2016 Q17 Errorless 1. Ecosystem MCQ
The primary producers of the deep-sea hydrothermal vent ecosystem are
A.
Coral reefs
B.
Green algae
C.
Chemosynthetic bacteria
D.
Blue-green-algae
NEET (Phase-II) 2016 Q18 Errorless 3. Critical Thinking MCQ
Which of the following is correct for r-selected species
A.
Small number of progeny with large size
B.
Large number of progeny with small size
C.
Large number of progeny with large size
D.
Small number of progeny with small size
MHCET 2015 Q19 Errorless 1. Ecosystem MCQ
Earthworm is a
A.
Herbivore
B.
Secondary consumer
C.
Tertiary consumer
D.
Detrivore
AIPMT 2015 Q20 Errorless 1. Ecosystem MCQ
Most animals that live in deep oceanic waters are
A.
Secondary consumers
B.
Tertiary consumers
C.
Detritivores
D.
Primary consumers
CBSE PMT 2014; KCET 2015 Q21 Errorless 1. Ecosystem 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.
0.2 J
B.
0.0002 J
C.
0.02 J
D.
0.002 J
NEET (Karnataka) 2013 Q22 Errorless 1. Ecosystem MCQ
Benthic organism are affected most by
A.
Light reaching the forest floor
B.
Surface turbulence of water
C.
Sediment characteristics of aquatic ecosystems
D.
Water-holding capacity of soil
NEET (Karnataka) 2013 Q23 Errorless 1. Ecosystem MCQ
Which one of the following is a primary consumer in maize field ecosystem
A.
Grasshopper
B.
Wolf
C.
Phytoplankton
D.
Lion
NEET (Karnataka) 2013 Q24 Errorless 1. Ecosystem MCQ
When man eats fish which feeds on zooplankton which have eaten small plants, the producer in the chain is
A.
Small plants
B.
Fish
C.
Man
D.
Zooplankton
J & K CET 2012 Q25 Errorless 1. Ecosystem MCQ
The detritus food chain begins with
A.
Primary producers
B.
Primary consumers
C.
Secondary consumers
D.
Dead organic matter