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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