Q. No.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
I. preying on native species.
II. out-competing native species for food, light, and breeding habitat.
III. lack of natural predators.
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Overexploitation is one of the “evil quartet” that increases the risk of extinction mainly for the:
1. animals that feed on a lower trophic level
2. large animals with low intrinsic reproductive rates
3. aquatic animals
4. terrestrial organisms
The biggest factor for the ‘biodiversity crisis' that we face today is:
1. Global warming
2. Environmental pollution
3. Habitat loss and fragmentation
4. A large and increasing human population
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Consider three sample areas with the following composition:
| Sample area I: | has three species of birds, two are represented by one individual each and the third by four individuals |
| Sample area II: | has three species of birds, each represented by two individuals |
| Sample area III: | has a species of insects, a species of mammals and a species of birds, each with two individuals |
Which area will be considered as the most diverse?
1. Sample area I
2. Sample area II
3. Sample area III
4. Sample area II and Sample area III are equally diverse
Regarding the gradients of biodiversity:
| I: | As we move from poles to the equator, broadly speaking, biodiversity decreases. |
| II: | There is an increase in species diversity from lower to higher altitudes. |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
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Plants are an important source of medicines for human use. Identify the incorrectly matched pair:
|
|
PLANT |
MEDICINE |
|
1. |
Taxusbrevifolia |
Anticancer drug |
|
2. |
Cinchona officinalis |
Anti-malarial |
|
3. |
Rauwolfiaserpentina |
Anti-hypertensive |
|
4. |
Catharanthusroseus |
Anti-helminthic |
The pink headed duck has got extinct mainly due to:
1. Habitat destruction
2. Overexploitation
3. Alien invasion
4. Pollution
Identify the correct statements regarding the “EDGE” species:
I. They are the only survivor members of their genus or even higher taxon.
II. To increase their conservation many are designated as “focal” species
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
The ‘Himalayan Quail’ got extinct due to:
1. Habitat destruction
2. Overexploitation
3. Alien invasion
4. Pollution
A bird that was previously thought to be extinct till its rediscovery in 1986 by Bharat Bhushan of Bombay Natural History Society is:
1. Great Indian Bustard
2. Jerdon’s Courser
3. White Peacock
4. Siberian crane
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