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  • 1(current)
Q. No.
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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The zone at the edge of a lake or ocean which is alternatively exposed to air and immersed in water is called?

1.Pelagic zone2.Benthic zone
3.Lentic zone4.Littoral zone

Subtopic:  Components & Types of Ecosystems |
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Nitrogen is often a limiting nutrient in terrestrial ecosystems because:

1.  the percentage of nitrogen in the atmosphere is low
2.  atmospheric nitrogen is primarily in the stratosphere
3.  dinitrogen cannot be used directly by the organisms
4.  there are regional fluctuations in nitrogen levels in the atmosphere
Subtopic:  Components & Types of Ecosystems |
 74%

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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):  Various adaptations have evolved in plants that can increase their uptake of nutrients.
Reason (R):  Plants are unable to ‘choose’ their environment as they are unable to move about.
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 |

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The ecosystem that can survive in the absence of the Sun would be:

1.tropical rainforest2.tundra
3.benthic ocean4.desert

Subtopic:  Components & Types of Ecosystems | Energy Flow |
 81%
From NCERT

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