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
The most effective biologic control of insects is achieved by:
| 1. | insectivorous birds | 2. | biocides |
| 3. | parasitoid wasps | 4. | parasitic nematodes |
Which one of the following is not a major characteristic feature of biodiversity hotspots?
1. A large number of species
2. Abundance of endemic species
3. Mostly located in the tropics
4. Mostly located in the polar regions
| 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
Biodiversity hotspots are characterized by:
| 1. | High number of endemic species and low threat of extinction |
| 2. | Low number of endemic species and low threat of extinction |
| 3. | Low number of endemic species and high threat of extinction |
| 4. | High number of endemic species and high threat of extinction |
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 |
Between community, diversity is known as:
| 1. | alpha diversity | 2. | beta diversity |
| 3. | gamma diversity | 4. | delta diversity |
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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