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Select Chapter Topics:
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Introduction
Components & Types of Ecosystems
Ecosystem Productivity
Ecological Efficiencies
Energy Flow
Ecological Flow
Ecological Pyramids
Decomposition
Mineral Cycling & Ecosystem Services (OLD NCERT)
Community Character
Ecological Succession (OLD NCERT)
Ecosystem Services
ECOSYSTEM – STRUCTURE AND FUNCTION
Q. No.

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A):  Most of an ecosystem’s production is eventually consumed by detritivores and decomposers.
Reason (R):  Energy is said to flow through, not cycle within, ecosystems.
 In the light of the above statements, choose the most appropriate answer from the options given below :
1.  Both (A) and (R) are true and (R) is the correct explanation of (A).
2.  Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.  (A) is true but (R) is false.
4.  Both (A) and (R) are false.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false

Subtopic:  Energy Flow |

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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A):  Most food chains or webs have only about four or five trophic levels.
Reason (R):  Trophic efficiencies are generally only about 10% in different ecosystems.
In the light of the above statements, choose the most appropriate answer from the options given below :
1.  Both (A) and (R) are True and (R) is the correct explanation of (A).
2.  Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.  (A) is True but (R) is False.
4.  Both (A) and (R) are False.
Subtopic:  Energy Flow |
 69%

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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A):  Net primary productivity is higher in warm climates than in cold ones.
Reason (R):  The limit on a community’s productivity is determined ultimately by the amount of sunlight it receives.
 In the light of the above statements, choose the most appropriate answer from the options given below :
1.  Both (A) and (R) are true and (R) is the correct explanation of (A).
2.  Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.  (A) is true but (R) is false.
4.  Both (A) and (R) are false.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Ecosystem Productivity | Energy Flow |
 64%

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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): There is no limitation on the number of trophic levels in a detritus food chain.
Reason (R): The transfer of energy between successive trophic levels in a detritus food chain does not follow the 10% rule.

In the light of the above statements, choose the most appropriate answer from the options given below :

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Energy Flow |
 52%
From NCERT

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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A):  Strongly vertically stratified habitats are very stable ecosystems.
Reason (R):  Through the formation of different layers a given habitat is better utilized.
 In the light of the above statements, choose the most appropriate answer from the options given below:
1.  Both (A) and (R) are true and (R) is the correct explanation of (A).
2.  Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.  (A) is true but (R) is false.
4.  Both (A) and (R) are false.
  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Components & Types of Ecosystems |
 70%

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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A):  Carnivores generally have higher assimilation efficiencies than herbivores.
Reason (R):  Carnivores generally consume more food than herbivores.

 In the light of the above statements, choose the most appropriate answer from the options given below:

1.  Both (A) and (R) are true and (R) is the correct explanation of (A).
2.  Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.  (A) is true but (R) is false.
4.  Both (A) and (R) are false.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Energy Flow |

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Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A):  Low temperature and anaerobiosis inhibit decomposition resulting in build-up of organic chemicals. 
Reason (R):  Most decomposers are anaerobic psychrophiles.

In the light of the above statements, choose the most appropriate answer from the options given below:

1.  Both (A) and (R) are true and (R) is the correct explanation of (A).
2.  Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.  (A) is true but (R) is false.
4.  Both (A) and (R) are false.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Decomposition |
 54%

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Sometimes the term "detritivore" is used interchangeably with:

1.decomposers2.primary consumers
3.secondary consumers4.autotrophs

Subtopic:  Decomposition |
 90%
From NCERT

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The minimum requirement for an ecosystem to recycle nutrients present in it would be:

1.  producers
2.  producers and decomposers
3.  producers, primary consumers, and decomposers
4.  producers, primary consumers, secondary consumers, and decomposers
Subtopic:  Decomposition |
 52%

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The best way to describe an ecosystem would be that they are:

1.  processors of energy and transformers of matter.
2.  processors of matter and transformers of energy.
3.  processors of matter and energy.
4.  transformers of matter but not of energy.

Subtopic:  Introduction |
 71%

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Select Chapter Topics:
filter
Introduction
Components & Types of Ecosystems
Ecosystem Productivity
Ecological Efficiencies
Energy Flow
Ecological Flow
Ecological Pyramids
Decomposition
Mineral Cycling & Ecosystem Services (OLD NCERT)
Community Character
Ecological Succession (OLD NCERT)
Ecosystem Services
ECOSYSTEM – STRUCTURE AND FUNCTION
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