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Introduction to Ecology
Introduction to the Chapter
Abiotic Factors: Temperature (OLD NCERT)
Abiotic Factors: Light & Water (OLD NCERT)
Response of Organisms to Abiotic Factors (OLD NCERT)
Adaptations (OLD NCERT)
Population Characters: Density
Population Characters: Natality & Mortality
Population Characters: Age Structure & Migration
Population Dynamic
Population: Exponential Growth Model
Population: Logistic Growth Model
Life History Variations
Population Interactions: Competition
Population Interactions: Predation
Population Interactions: Parasitism
Population Interactions: Amensalism
Population Interactions: Commensalism, Protocooperation & Mutualism
Population Interactions: Coevolution
Age Pyramid
Population Attributes
Abiotic Factors: soil
Q. No.

While heat gain or heat loss is the function of ________, heat production is the function of _______ of the body of an animal.
1. Volume; Surface area
2. Surface area; Volume
3. Volume; Volume
4. Surface area; Surface area

Subtopic:  Response of Organisms to Abiotic Factors (OLD NCERT) |
 78%

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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): 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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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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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): The newly acquired predators and parasites are often more damaging than the older ones.
Reason (R): The older ones are familiar and the species getting affected have adjusted.
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 | Population Interactions: Parasitism |
 73%

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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): Mammals with smaller body size find thermoregulation more challenging than those with larger body size.
Reason (R): Mammals with smaller body size are ectotherms and mammals with larger body size are endotherms.
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:  Response of Organisms to Abiotic Factors (OLD NCERT) |

To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.

Hints
Select Chapter Topics:
filter
Introduction to Ecology
Introduction to the Chapter
Abiotic Factors: Temperature (OLD NCERT)
Abiotic Factors: Light & Water (OLD NCERT)
Response of Organisms to Abiotic Factors (OLD NCERT)
Adaptations (OLD NCERT)
Population Characters: Density
Population Characters: Natality & Mortality
Population Characters: Age Structure & Migration
Population Dynamic
Population: Exponential Growth Model
Population: Logistic Growth Model
Life History Variations
Population Interactions: Competition
Population Interactions: Predation
Population Interactions: Parasitism
Population Interactions: Amensalism
Population Interactions: Commensalism, Protocooperation & Mutualism
Population Interactions: Coevolution
Age Pyramid
Population Attributes
Abiotic Factors: soil
Q. No.

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