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Free download in PDF Ecosystem Multiple Choice Questions (MCQs) 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>
(1)
Through, which of the following, energy enters in an ecosystem?
[A]
Herbivores
[B]
Producer
[C]
Decomposer
[D]
Primary producers
(2)
Why is algae placed in first place of food chain?
[A]
Algae is first to synthesize food
[B]
Algae is first to consume food
[C]
Every living organism can utilize food
[D]
None of the given
Answer: Algae is first to synthesize food
(3)
In which of the following wheat eating pegions included ?
[A]
Decomposer
[B]
Primary consumer
[C]
primary producers
[D]
secondary consumer
(4)
which of the following is placed in upper most (highest) level of ecological pyramids.
[A]
Herbivores
[B]
Carnivors
[C]
Primary and Secondary Producers
[D]
Primary and Secondary consumer
(5)
As we proceed in food chain, bio-mass
[A]
Remain Same
[B]
Decreases
[C]
Increases
[D]
Initially same and later keep decreasing
(6)
In ecosystem the source of energy is
[A]
ATP
[B]
Sun
[C]
The Green plant
[D]
Sugar
(7)
Who is primary consumer of biotic community ?
[A]
Herbivores/ Grazing animal
[B]
Omnivores
[C]
Scavengers
[D]
Carnivores
Answer: Herbivores/ Grazing animal
(8)
In which of the following weeds are placed?
[A]
Primary producers
[B]
Secondary consumer
[C]
Primary consumer
[D]
Decomposer
Answer: Primary producers
(9)
When does the energy flow start in an ecosystem ?
[A]
When material cycle starts
[B]
When sun rises
[C]
When any living organism gain food
[D]
When light energy is converted in chemical energy
(10)
Which of the following option is correct for storage place phosphorus and nitrogen respectively?
[A]
Consumer
[B]
Parental rock and environment
[C]
Environment and producers
[D]
Environment and parental rock
Answer: Parental rock and environment
(11)
Which of the following is trophic level of the orchid staying on mango tree?
[A]
First
[B]
Tertiary/ Third
[C]
Second
[D]
Fourth
(12)
Which age group in pyramid indicate less reproductive potential?
[A]
Bell shaped
[B]
Triangular
[C]
Inverted Bell shaped
[D]
All of them have equal (same) potential
Answer: Inverted Bell shaped
(13)
It is correct for ecosystem
[A]
(Plants, Animals, Microorganisms) + Abiotic environment
[B]
Community formed by various species present in a particular region
[C]
Animal, plants and micro- organisms
[D]
Abiotic factors
Answer: (Plants, Animals, Microorganisms) + Abiotic environment
(14)
What is the original source of energy for the living organisms?
[A]
Carbohydrate
[B]
Sun light
[C]
ATP
[D]
Lipid
(15)
In which of the following curd eating people are included?
[A]
Producer
[B]
First
[C]
Tertory
[D]
Second
(16)
The functional efficiency of ecosystem is effected when decomposers are removed from it, because
[A]
Energy flow will stop
[B]
Rest components decomposition will become faster
[C]
Herbivors will not get sun light
[D]
Flow of nutrient will stop
Answer: Flow of nutrient will stop
(17)
From which of the following detritus food chain will start ?
[A]
Algae
[B]
Bacteria
[C]
Protozoa
[D]
Virus
(18)
Which of the following is gaseous cycle?
(1) Sulphur cycle
(3) Phosphorous cycle
(2) Carbon cycle
(4) Nitrogen cycle
[A]
1
[B]
1,2
[C]
3, 4
[D]
1,3,4
(19)
At Each trophic level, in which form energy is lost ?
[A]
Heat
[B]
Chemical
[C]
Light
[D]
None
(20)
Which Source of eutrophication is the modern source of phosphorus ?
[A]
Detergent
[B]
Fertilizer
[C]
Faecal of animal
[D]
Rivers
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