Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Ice fish is able to thrive in Antarctic water where the temperature is always below zero.
Reason (R): They have a special haemoglobin molecule that has very high affinity for oxygen.
 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:  Adaptations (OLD NCERT) |
 57%

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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): A population that fits the logistic growth model increases more rapidly at intermediate size rather than at relatively small and large sizes.
Reason (R): The population growth rate decreases dramatically as the population size approaches the carrying capacity.
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:  Population: Logistic Growth Model |

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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): In every species, there are trade- offs between survival and reproductive traits.
Reason (R): Natural selection favors traits that improve an organism’s chances of survival and reproductive success.
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:  Introduction to Ecology |
 66%

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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): India’s population is set to overtake China’s population by 2025.
Reason(R): The birth rate in china is decreasing while it is increasing in India.
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:  Population Attributes |

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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): Age-structure pyramids for the population of a country not only predict a population’s growth trends but can also illuminate social conditions.
Reason (R): These pyramids show the distribution of various age groups in a population, typically that of a country or region of the world.
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:  Age Pyramid |

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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): Ecologically similar species can coexist in a community if one or more significant differences in their niches arise through time.
Reason (R): Two species cannot coexist permanently in a community if their niches are identical.
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:  Introduction to Ecology |

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Assertion: Differences among similar species whose distributions overlap geographically are accentuated in regions where the species co-occur.
Reason: The differences are minimized or lost where the species’ distributions do not overlap.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason 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:  Response of Organisms to Abiotic Factors (OLD NCERT) |
 52%

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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): The adaptations of both predators and prey tend to be refined through natural selection.
Reason (R): Predation provides energy to prolong life and promote the reproduction of the organism that does the killing, the predator, to the detriment of the organism being consumed, the prey.
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:  Adaptations (OLD 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):  Apex predators help in maintaining species diversity in a community.
Reason (R):  Apex predators are often keystone species.
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:  Population Interactions: Predation |
 60%

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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): Milkweeds are particularly favoured as their food by most herbivores.
Reason (R): Milkweeds produce cardiac glycosides that are very good for the heart of 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:  Population Interactions: Predation |
 63%

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