Q. No.When certain exotic species are introduced into a geographical area, they become invasive mainly because:
1.
The invaded land has unlimited resources for the introduced species
2.
The invaded land does not have its natural predator
3.
The population of the introduced species in the invaded land is very low
4.
Introduced species do not face any competition in the introduced land
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In a field experiment, when all Pisaster starfish were removed from an enclosed intertidal area, the result was:
| 1. | Increase in diversity of invertebrates |
| 2. | Extinction of many invertebrate species |
| 3. | Inability of the Pisaster to enter the area again |
| 4. | Replacement of Pisaster by other starfish |
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Camouflage is:
| 1. | Cryptic coloration | 2. | Aposematic coloration |
| 3. | Incidental coloration | 4. | Dispersive coloration |
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The monarch butterfly acquires distasteful toxin during:
| 1. | Caterpillar stage by feeding on a poisonous weed |
| 2. | Caterpillar stage by feeding on sap of a grass |
| 3. | Adult stage by feeding on nectar of a flowering plant |
| 4. | Adult stage by feeding on latex of deadly night shade plant |
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The most common means of morphological defense in plants against herbivory are:
| 1. | Spines | 2. | Thick cuticle |
| 3. | Thorns | 4. | Slime |
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Nicotine, caffeine, quinine and opium produced by plants are actually:
1. Primary metabolites needed in reproduction
2. Secondary metabolites needed for growth
3. Alkaloids that are present in seeds
4. Defenses against grazers and browsers
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Consider the given statements regarding competition amongst organisms:
| I: | Only related species can compete for the same resource |
| II: | Competition occurs only when the resources are limiting |
The correct statement/s is/are:
| 1. | I alone | 2. | II alone |
| 3. | Both I and II | 4. | Neither I nor II |
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In some shallow American lakes, unrelated visiting Flamingoes and resident fishes compete for the common food which is:
| 1. | Crustaceans | 2. | Zooplankton |
| 3. | Cichlid fishes | 4. | Prawns |
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A process in which the fitness of one species is significantly lower in the presence of another species, is termed as :
| 1. | Predation | 2. | Parasitism |
| 3. | Competition | 4. | Amensalism |
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