Assertion (A): | Species diversity contributes to the well-being of an ecosystem. |
Reason (R): | Rich biodiversity contributes to higher productivity of an 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. |
Assertion: Umbrella species are species selected for making conservation-related decisions.
Reason: Umbrella species has a disproportionately large effect on its natural environment relative to its abundance.
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
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. |
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. |
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. |
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. |
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. |
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. |
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. |
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. |
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. |
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