Ecosystem MCQs | Ecosystem Short Questions with Answers

Questions
Lincoln index measures
A Population mortality rate
B Population natality rate
C Population size
D Population density

Answer:Population size
2 Allelopathy refers to
A Inhibition of growth of one species by another by the production of toxins
B Inhibition of sporulation of pathogen by the host
C Altering the reproductive cycle of one organism by another
D Inhibition of growth of one species by another by preventing reproduction

Answer: Inhibition of growth of one species by another by the production of toxins
3 The ratio between energy flow at different points in a food chain is known as
A Ecological capacity
B Ecological efficiency
C Ecological assimilation
D Ecological potential

Answer: Ecological efficiency
4 The ability of a population to increase under ideal environmental conditions is called
A Natality
B Carrying capacity
C Biotic potential
D Absolute natality

Answer:Biotic potential
5 In an ecosystem, the energy flow is always
A Always unidirectional
B Always bidirectional
C In any direction
D Always down directional

Answer: Always unidirectional
6 In thermal stratification, the middle region which shows vertical temperature change is called
A Mesolimnion
B Epilimnion
C Metalimnion
D Hypolimnion

Answer:Metalimnion
7 Select a non-denitrifying bacteria
A Pseudomonas aeruginosa
B Thiobacillus
C Thiobacillus denitrificans
D Bacillus ramosus

Answer:Bacillus ramosus
8 Which one is a ‘K’ selected species?
A Aspergillus
B Human
C Taraxacum
D Grass

Answer:Human
9 All species of Lemur are endemic to which area?
A Madagascar
B Seychelles Island
C Galapagos Island
D New Caledonia

Answer:Madagascar
10 The upper part of an aquatic ecosystem contains
A Nekton
B Plankton
C Benthos
D both (1) and (2)

Answer:Plankton
11 What type of food chain is it?
dead animals → blowfly maggot → maggots → frog → snake
A Detrital food chain
B Decomposer food chain
C Predator food chain
D Grazing food chain

Answer:Detrital food chain
12 Identify the mismatched pair
A Tundra – Permafrost
B Savanna – Acacia trees
C Prairie – Epiphytes
D Coniferous forest – Evergreen trees

Answer:Prairie – Epiphytes
13 “The pyramid of energy is always upright” states that
A The energy conversion efficiency of herbivores is better than carnivores
B The energy conversion efficiency of carnivores is better than herbivores
C Producers have the lowest energy conversion efficiency
D Energy conversion efficiency is the same in all trophic levels

Answer:The energy conversion efficiency of herbivores is better than carnivores
14 The population of birds declined in an area where DDT was extensively used. Why?
A The birds stopped laying eggs
B The eggs laid by the birds did not hatch
C The snakes ate the eggs
D The DDT spray killed all the birds

Answer:The eggs laid by the birds did not hatch
15 Which of the following lake zones has phytoplanktons in abundance?
A Littoral zone
B Benthic zone
C Limnetic zone
D Profundal zone

Answer:Limnetic zone
16 Plant species with a wide range of genetic distribution evolve into a local population known as
A Ecotype
B Population
C Ecosystem
D Biome

Answer:Ecotype
17 dB is the abbreviation used for the quantitative expression of
A Density of bacteria in a medium
B A Particular Pollutant
C Dominant Bacillus in a culture
D A pesticide

Answer:A Particular Pollutant
18 The eggshell of birds becomes thin by the pollution from pesticides due to the interference in the activity of
A Calmodulin
B MgATPase
C CaATPase
D Calcium

Answer:CaATPase
19 Genetically different population with the same physical features is known as ____________
A Ecosystem
B Ecads
C Community
D Ecotype

Answer:Ecotype
20 Niche is a place where particular organisms live.
A True
B False

Answer:False
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