Q. No.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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Abingdon tortoise in Galapagos islands became extinct within a decade after goats were introduced on the island due to:
1. Habitat fragmentation
2. Better browsing efficiency of goats
3. Predator of goat attacking tortoise
4. Virus of goats parasitizing tortoise
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The ‘Competitive Exclusion Principle’ was given by:
| 1. | Gause | 2. | Connell |
| 3. | Tillman | 4. | Paul Ehrlich |
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A species whose distribution is restricted to a small geographical area because of the presence of a competitively superior species, is found to expand its distributional range dramatically when the competing species is experimentally removed. This is called:
| 1. | Competitive Exclusion | 2. | Competitive Release |
| 3. | Competitive Supremacy | 4. | Competitive Inclusion |
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“Competitive Exclusion Principle” may be true if:
| 1. | The competing species are equally capable |
| 2. | Resource partitioning occurs |
| 3. | There is only intraspecific competition |
| 4. | Resources are limiting |
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One mechanism that promotes co-existence rather than exclusion amongst competing species is:
| 1. | Periodic migration | 2. | Hibernation and aestivation |
| 3. | Resource partitioning | 4. | Reproductive isolation |
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Which of the following is not an ectoparasite?
1. Lice on humans
2. Copepods on marine fishes
3. Mistletoe on other plants
4. Female Anopheles on humans
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