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Q. No.Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A):
In almost all cases, habitat fragmentation leads to species loss.
Reason (R):
Human alteration of habitat is the single greatest threat to diversity throughout the biosphere.
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: Loss of Biodiversity |
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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): | Endemic organisms with limited ranges are most affected by habitat destruction. |
| Reason (R): | These organisms are not found anywhere else in the world, and thus have less chance of recovering. |
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. |
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: Loss of Biodiversity |
77%
From NCERT
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
Hints
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
| Assertion (A): | Pollution may cause extinction debt - future extinction of species due to events in the past. |
| Reason (R): | Extinction debt occurs because of time delays between impacts on a species, such as destruction of habitat, and the species' ultimate disappearance. |
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. |
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: Loss of Biodiversity |
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
In the light of the above statements, choose the most appropriate answer from the options given below :
| Assertion (A): | The indirect effects of losing many species as well as the diversity of ecosystems in general are enormous. |
| Reason (R): | When biodiversity is lost, the environment loses many species that perform valuable and unique roles in the ecosystem. |
| 1. | Both (A) and (R)are true and (R) is the correct explanation of the (A). |
| 2. | Both(A) and (R) are true but (R) is not the correct explanation of the (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: Loss of Biodiversity |
73%
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
In light of the above statements, choose the most appropriate answer from the options given below :
| Assertion (A): | Intermediate frequency or intensity of disturbance in a biological community will maximize diversity. |
| Reason (R): | Only at intermediate levels of disturbance do a mix of colonizers and competitors co-exist. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of the (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. |
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: Loss of Biodiversity |
51%
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
In the light of the above statements, choose the most appropriate answer from the options given below :
| Assertion (A): | Non-native introduced species always have a negative impact on the ecosystem in which they have been introduced. |
| Reason (R): | Non-native species always become invasive in the introduced ecosystem. |
| 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: Loss of Biodiversity |
From NCERT
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
Hints
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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): | If introduced species evolved under great competition or predation in their native habitat, they are more likely to become invasive in the introduced habitat. |
| Reason (R): | Then the new environment may host fewer able competitors, allowing the invader to proliferate quickly. |
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 reason 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. |
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: Loss of Biodiversity |
69%
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
In the light of the above statements, choose the most appropriate answer from the options given below :
| Assertion (A): | Island ecosystems are generally more prone to invasion by the introduced species. |
| Reason (R): | Invasion is more likely in ecosystems that was similar to the one in which the potential invader evolved. |
| 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. |
.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: Loss of Biodiversity |
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
| Assertion (A): | Animals like elephants and whales are highly prone to extinction due to over-exploitation. |
| Reason (R): | Large-body-sized animals with low rates of reproduction makes them more susceptible to extinction. |
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. |
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
Subtopic: Loss of Biodiversity |
65%
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
In the light of the above statements, choose the most appropriate answer from the options given below :
| Assertion (A): | Conserving the biological diversity of the ecological hotspots is very important component of efforts to safeguard the world’s biological heritage. |
| Reason (R): | The hotspots of biodiversity cover a large percentage of the land area of earth. |
| 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: In Situ Conservation of Biodiversity | Biodiversity Conservation |
75%
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