Q. No.| 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
The most serious negative impact of loss of biodiversity on humans would be due to:
1. global warming and ozone depletion.
2. loss of ecosystem services.
3. loss of source of genetic diversity to preserve endangered species.
4. loss of species for ʺbioprospecting.ʺ
| Assertion (A): | Certain exotic species, introduced into a geographical area, become invasive. |
| Reason (R): | The exotic species that become invasive can only be plants that can reproduce asexually very rapidly. |
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. | (A) is false but (R) is true. |
- 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
| 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
Match each item in Column I with one in column II and select the correct answer from the codes given:
|
|
COLUMN I |
|
COLUMN II |
|
A |
Dodo |
P |
Bird |
|
B |
Thylacine |
Q |
Zebra |
|
C |
Quagga |
R |
Marsupial |
|
D |
Steller’s sea cow |
S |
Aquatic mammal |
Codes:
|
A |
B |
C |
D |
|
|
1. |
P |
Q |
R |
S |
|
2. |
P |
Q |
S |
R |
|
3. |
P |
R |
Q |
S |
|
4. |
S |
R |
Q |
P |
Which one of the following is an endangered plant species in India?
| 1. | Rauwolfia serpentine | 2. | Santalum album (Sandalwood) |
| 3. | Cycasbeddonel | 4. | All of these |
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The most effective means of conservation is to:
1. remove predators
2. preserve habitats
3. vaccinate against diseases
4. census the species during the breeding season
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To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
Exotic alien introduced species can become invasive in the introduced ecosystem due to:
I. preying on native species.
II. out-competing native species for food, light, and breeding habitat.
III. lack of natural predators.
| 1. | Only I and II | 2. | Only I and III |
| 3. | Only II and III | 4. | I, II and III |
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To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
Which of the following is not a cause for the loss of biodiversity?
1. Destruction of habitat
2. Invasion by alien species
3. Keeping animals in zoological parks
4. Over-exploitation of natural resources
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
The peregrine falcon in the United States got extinct due to:
| 1. | loss of habitat | 2. | pesticides |
| 3. | loss of food supply | 4. | predation |
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