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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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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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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“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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Cuckoos laying their eggs in the nests of crow is an example of:
| 1. | Ectoparasitism | 2. | Endopararsitism |
| 3. | Hyperparasitism | 4. | Brood parasitism |
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An orchid growing as an epiphyte on a mango branch is an example of:
| 1. | Ectoparasitism | 2. | Endopararsitism |
| 3. | Commensalism | 4. | Mutualism |
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