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Q. No.
Given below are two statements:
Assertion (A):
Constant internal environment enhances overall 'fitness' of the species.
Reason (R):
Homeostasis permits all biochemical reactions and physiological functions to proceed with maximal efficiency.
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: Response of Organisms to Abiotic Factors (OLD NCERT) |
79%
From NCERT
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Given below are two statements:
| Assertion (A): | Small animals tend to lose body heat very fast when it is cold outside. |
| Reason (R): | Heat loss is a function of body volume. |
| 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: Abiotic Factors: Temperature (OLD NCERT) |
From NCERT
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Given below are two statements:
| Assertion (A): | A population has certain attributes like birth rates and death rates while an individual organism does not. |
| Reason (R): | The birth and death rates are expressed as change in numbers w.r.t. members of a population. |
| 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: Population Attributes |
From NCERT
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Given below are two statements:
| Assertion (A): | Certain exotic species become invasive and start spreading very fast in a geographical area. |
| Reason (R): | The invaded land does not have natural predators of exotic species. |
| 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: Population Interactions: Predation |
88%
From NCERT
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Given below are two statements:
| Assertion (A): | Ten species of invertebrates became extinct within a year when all the starfish were removed from an enclosed intertidal zone. |
| Reason (R): | Starfish is an important predator which reduces intensity of competition among invertebrates |
| 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: Population Interactions: Predation |
85%
From NCERT
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Given below are two statements:
| Assertion (A): | Some species of insects and frogs are cryptically coloured to avoid being detected easily by the predator. |
| Reason (R): | Monarch butterfly develops a special chemical in its body by feeding on a poisonous weed at caterpillar stage. |
| 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: Population Interactions: Predation |
83%
From NCERT
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Given below are two statements:
| Assertion (A): | Plants can avoid their predators like phytophagous insects. |
| Reason (R): | Plants have evolved an astonishing variety of morphological and chemical defence against herbivores |
| 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: Population Interactions: Predation |
73%
From NCERT
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Given below are two statements:
| Assertion (A): | Competition leads to decrease in the fitness of one species in the presence of another species |
| Reason (R): | Competing species either compete for same resources or one species reduces feeding efficiency of another species. |
| 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: Population Interactions: Competition |
76%
From NCERT
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Given below are two statements:
| Assertion (A): | In the presence of competitively superior species, the distribution of another species is restricted to a small geographical area. |
| Reason (R): | Competitively superior species reduces the intrinsic rate of increase of another species. |
| 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: Population Interactions: Competition |
84%
From NCERT
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Given below are two statements:
| Assertion (A): | The cattle egrets and grazing cattles show commensalism. |
| Reason (R): | Egrets catch those insects which are found due to cattle grazing. |
| 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: Population Interactions: Commensalism, Protocooperation & Mutualism |
82%
From NCERT
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