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Q. No.Biosphere is:
| 1. | A component in the ecosystem |
| 2. | Composed of the plants present in the soil |
| 3. | Life in the outer space |
| 4. | Composed of all living organisms present on earth which interact with the physical environment |
Subtopic: Introduction to Ecology | Organisms and its Environment |
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The niche of an organism refers to:
| 1. | Its role in the ecosystem, including its interactions with other organisms. |
| 2. | The physical space it occupies. |
| 3. | Its position in the food chain. |
| 4. | The specific area where it lives. |
Subtopic: Organisms and its Environment |
86%
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Consider the following statements:
| I: | When certain exotic species are introduced into a geographical area, they become invasive because the invaded land does not have its natural predators. |
| II: | Competition is best defined as a process in which the fitness of one species is significantly lower in the presence of another species. |
| III: | Biological control methods adopted in agricultural pest control are based on the ability of the predator to regulate the prey population. |
Which of the above statements are true?
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II, and III |
Subtopic: Population Interactions: Competition | Population Interactions: Predation |
84%
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The sum of the environmental factors that tend to restrict the biotic potential of an organism is called environmental resistance. In the logistic growth equation dN/dt = rN[K-N/K], the environmental resistance is represented by:
| 1. | r | 2. | N |
| 3. | K | 4. | [K-N]/K |
Subtopic: Population: Logistic Growth Model |
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In an area, there are 200 carrot grass plants but only a single huge banyan tree with a large canopy.
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I. | The ecological role of the banyan tree in this community is negligible when compared to that of carrot grass. |
| II. | In this community, the percent cover or biomass is a more meaningful measure of the population size. |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Population Attributes |
75%
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Identify the correct statements:
| I: | Pacific salmon and bamboo breed many times during their lifetimes. |
| II: | Birds and mammals breed many times during their lifetimes and produce a small number of large-sized offspring. |
| III: | Oysters and pelagic fishes produce a large number of small-sized offspring. |
| 1. | Only I and II | 2. | Only I and III |
| 3. | Only II and III | 4. | I, II and III |
Subtopic: Life History Variations |
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Predators:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I nor II are incorrect
| I: | act as conduits for energy transfer across trophic levels |
| II: | do not include herbivores even in broad ecological context |
2. Only II is correct
3. Both I and II are correct
4. Both I nor II are incorrect
Subtopic: Population Interactions: Predation |
82%
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Identify the examples of commensalism:
1. Only I, II and III
2. Only I, III and IV
3. Only I, II and IV
4. Only II, III and IV
| I: | An orchid growing as an epiphyte on a mango branch |
| II: | Barnacles growing on the back of a whale |
| III: | Cuckoo laying eggs in the nests of crow |
| IV: | Clown fish living among the tentacles of sea anemone |
2. Only I, III and IV
3. Only I, II and IV
4. Only II, III and IV
Subtopic: Population Interactions: Coevolution |
84%
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What would be true for an orchid growing as an epiphyte on a mango plant?
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
| I: | It grows on mango for physical support |
| II: | It affects mango negatively |
2. Only II
3. Both I and II
4. Neither I nor II
Subtopic: Population Interactions: Commensalism, Protocooperation & Mutualism |
81%
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Consider the given two statements:
1. I is correct; II is correct
2. I is correct; II is incorrect
3. I is incorrect; II is correct
4. I is incorrect; II is incorrect
| I: | When resources in a habitat are unlimited, populations undergo exponential growth. |
| II: | Resources are always unlimited for plants but never for animals. |
2. I is correct; II is incorrect
3. I is incorrect; II is correct
4. I is incorrect; II is incorrect
Subtopic: Population: Exponential Growth Model |
85%
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