Q. No.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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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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