Ecosystem — DPP 2

20 NEET questions from Ecosystem, with answers and explanations. Attempt it as a timed test to get scoring, accuracy breakdown and mistake tracking.

Attempt this test free 20 questions · 30 minutes · +80 marks
1
A pond is a :-
  1. A Biome
  2. B Natural ecosystem
  3. C Artificial ecosystem
  4. D Community of plants & animals
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Correct answer: B

2
Which of the following statement is incorrect?
  1. A Detritivores break down detritus into smaller particle this process is called catabolism.
  2. B Decomposition is largely an oxygen requiring process.
  3. C Decomposition rate is slower if detritus is rich in lignin and chitin.
  4. D Temperature and soil moisture are the most important climate factors that regulate decomposition.
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Correct answer: A

3
Given below are two statements:
Statement-I: Vertical distribution of different species occupying different levels is called stratification.
Statement-II: Interaction of biotic and abiotic components results in a physical structure that is characteristic for each type of ecosystem.
In the light of the above statements, choose the correct answer from the options given below:
  1. A Statement I is true but Statement II is false.
  2. B Statement I is false but Statement II is true.
  3. C Both Statement I Statement II is true.
  4. D Both Statement I Statement II is false.
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Correct answer: C

4
Ecosystem term coined by :-
  1. A Odum
  2. B Mishra
  3. C Reiter
  4. D Tansley
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Correct answer: D

5
In the process of decomposition, some nutrients get tied up with the biomass of microbes and become temporarily unavailable to other organisms. Such incorporation of nutrient in living microbes (bacteria \& fungi) is called $\_\_\_\_$ .
  1. A Leaching
  2. B Fragmentation
  3. C Nutrient immobilization
  4. D Humification
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Correct answer: B

6
Assertion : Sun is not the immediate source of energy for deep sea hydrothermal vent.
Reason : Around these vents, the food web begins with chemosynthetic bacteria rather than photosynthetic organism.
  1. A Both Assertion & Reason are true, and the reason is the correct explanation of the Assertion.
  2. B Both Assertion & Reason are true, but the reason is not the correct explanation of the Assertion.
  3. C Assertion is true statement, but Reason is false.
  4. D Both Assertion and Reason are false statements.
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Correct answer: A

7
Which of the following is an abiotic components of the ecosystem ?
  1. A Bacteria
  2. B Humus
  3. C Plants
  4. D Fungi
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Correct answer: B

8
Biotic and abiotic components form :-
  1. A Community
  2. B Ecosystem
  3. C Population
  4. D Species
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Correct answer: B

9
Total amount of inorganic matter present in particular area at a particular time in an ecosystem in known as :-
  1. A Standing state
  2. B Standing crop
  3. C Standing quality
  4. D Both (B) and (C)
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Correct answer: A

10
Given below are two statements:
Statement-I: Primary production is defined as the amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis.
Statement-II: Secondary productivity is defined as the rate of formation of new organic matter by consumers.
In the light of the above statements, choose the correct answer from the options given below:
  1. A Statement I is true, but Statement II is false.
  2. B Statement I is false, but Statement II is true.
  3. C Both Statement I Statement II are true.
  4. D Both Statement I Statement II are false.
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Correct answer: C

11
Which one of the following processes during decomposition is correctly described?
  1. A Leaching - Water soluble inorganic nutrients rise to the top layers of soil
  2. B Fragmentation - Carried out by organisms such as earthworm
  3. C Humification - Leads to the accumulation of a dark coloured substance humus which undergoes microbial action at a very fast rate
  4. D Catabolism-Last step in the decomposition under fully anaerobic condition
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Correct answer: B

12
A sparrow is a $\_\_\_\_$ consumer when it eats seeds, fruits, peas, and a $\_\_\_\_$ consumer when it eats insects and worms.
  1. A Secondary, Primary
  2. B Primary, Secondary
  3. C Tertiary, Secondar
  4. D Primary, Tertiary
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Correct answer: B

13
An inverted pyramid of biomass can be found in which ecosystem: -
  1. A Forest
  2. B Pond
  3. C Grass land
  4. D Tundra
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Correct answer: B

14
Leaching is :-
  1. A Break down of detritus into smaller particles
  2. B Downward movement of water-soluble inorganic nutrients
  3. C Degradation of detritus into simpler inorganic nutrients
  4. D Releasing of inorganic nutrients from humus
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Correct answer: B

15
Statement-1 : Death of organism is the beginning of the detritus food chain/web.
Statement 2 : Amount of energy decreases at successive trophic levels.
  1. A Both statement 1 and 2 are incorrect
  2. B Statement 1 is correct but statement 2 is incorrect
  3. C Statement 1 is incorrect but statement 2 is correct
  4. D Both statement 1 and 2 are correct
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Correct answer: D

16
If we completely remove decomposers from an ecosystem, the ecosystem functioning will be adversely affected because: -
  1. A Mineral movement will be blocked
  2. B Herbivores will not receive solar energy
  3. C Energy flow will be blocked
  4. D Rate of decomposition of other components will be very high
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Correct answer: A

17
Which of the following ecosystem has the highest gross primary productivity :-
  1. A mangrove
  2. B rain forest
  3. C grassland
  4. D coral reef
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Correct answer: B

18
There are certain limitations of ecological pyramids choose the correct option :-
(A) It assumes a simple food chain
(B) Saprophytes are not given any place in ecological pyramids.
(C) It does not take into account the same species belonging to two or more trophic levels
  1. A A, B Only
  2. B B, C Only
  3. C only B
  4. D All the above
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Correct answer: B

19
Net community productivity (NCP) is given by the formulae :
  1. A NCP = GPP + NPP
  2. B NCP $= \frac { \text { GPP } } { \text { NPP } } \times 100$
  3. C NCP $=$ GPP - R
  4. D NCP = NPP - Heterotrophic Consumption
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Correct answer: D

20
Ecosystem is:-
  1. A Any functional unit that includes the whole community in a given area interacting with the abiotic factors
  2. B A group of green plants
  3. C A group of animals interacting with environment
  4. D Man and pets living together
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Correct answer: A

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