Q. No.Predators do not:
1.
act as ‘conduits’ for energy transfer across trophic levels
2.
keep prey populations under control
3.
over-exploit their prey
4.
help in maintaining species diversity in a community
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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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Predators in nature are ‘prudent’ because:
| 1. | This keeps their own population in check |
| 2. | Prudence keeps their hunting skills up to date |
| 3. | Lack of prudence can lead to their own extinction |
| 4. | This helps in the maintenance of genetic diversity in their gene poll |
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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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As a mechanism of defense against herbivory, Calotropis:
1. Has a large number of thorns
2. Secretes cardiac glycosides
3. Produces a neurotoxin, strychnine
4. Releases a hallucinogen
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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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