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Free download in PDF Ecosystem Short Questions with Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like NEET, AIIMS, JIPMER etc. These short solved questions or quizzes are provided by Gkseries./p>
Lincoln index measures
[A]
Population mortality rate
[B]
Population natality rate
[C]
Population size
[D]
Population density
(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
(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
(7)
Select a non-denitrifying bacteria
[A]
Pseudomonas aeruginosa
[B]
Thiobacillus
[C]
Thiobacillus denitrificans
[D]
Bacillus ramosus
(8)
Which one is a ‘K’ selected species?
[A]
Aspergillus
[B]
Human
[C]
Taraxacum
[D]
Grass
(9)
All species of Lemur are endemic to which area?
[A]
Madagascar
[B]
Seychelles Island
[C]
Galapagos Island
[D]
New Caledonia
(10)
The upper part of an aquatic ecosystem contains
[A]
Nekton
[B]
Plankton
[C]
Benthos
[D]
both (1) and (2)
(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
(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
(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
(19)
Genetically different population with the same physical features is known as ____________
[A]
Ecosystem
[B]
Ecads
[C]
Community
[D]
Ecotype
(20)
Niche is a place where particular organisms live.
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