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Q. No.Under normal circumstances, which of the following are not important factors influencing population density in an area?
I:
Natality
II:
Mortality
III:
Emigration
IV:
Immigration
1. I and II
2. III and IV
3. I and III
4. II and IV
Subtopic: Population Characters: Density | Population Characters: Natality & Mortality |
86%
Level 1: 80%+
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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%
Level 1: 80%+
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The correct equation for exponential population growth will be:
1. dN/dt = r + N
2. dN/dt = r/N
3. dN/dt = r N
4. dN/dt = r – N
1. dN/dt = r + N
2. dN/dt = r/N
3. dN/dt = r N
4. dN/dt = r – N
Subtopic: Population: Exponential Growth Model |
90%
Level 1: 80%+
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The term that describes the maximum number of individuals a population can sustain in a given environment is:
1. Carrying capacity
2. Biotic potential
3. Limiting factor
4. Environmental resistance
1. Carrying capacity
2. Biotic potential
3. Limiting factor
4. Environmental resistance
Subtopic: Population Characters: Density | Population Characters: Natality & Mortality |
90%
Level 1: 80%+
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You can see a concave shape in the upper part of the population pyramid shown in the given figure. This might signify:
1. High birth rates
2. Low birth rates
3. High life expectancy
4. Rapid population decline
1. High birth rates
2. Low birth rates
3. High life expectancy
4. Rapid population decline
Subtopic: Age Pyramid |
Level 4: Below 35%
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According to the logistics growth model, if a population overshoots its carrying capacity, what is likely to happen?
1. Population crash
2. Rapid exponential growth
3. Beginning of a new lag phase
4. Slower population growth
1. Population crash
2. Rapid exponential growth
3. Beginning of a new lag phase
4. Slower population growth
Subtopic: Population: Logistic Growth Model |
53%
Level 3: 35%-60%
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In a symbiotic relationship between two species, one benefits and the other is unaffected. This type of relationship is described as:
| 1. | Mutualism | 2. | Commensalism |
| 3. | Parasitism | 4. | Competition |
Subtopic: Population Interactions: Commensalism, Protocooperation & Mutualism |
94%
Level 1: 80%+
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What ecological principle has been paraphrased in the maxim "complete competitors cannot coexist"?
1. Competitive release
2. Exploitative competition
3. Interference competition
4. Competitive exclusion
1. Competitive release
2. Exploitative competition
3. Interference competition
4. Competitive exclusion
Subtopic: Population Interactions: Competition |
76%
Level 2: 60%+
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Consider the two statements:
| I: | In ecology, the term “niche” describes the role an organism plays in a community. |
| II: | A species’ niche encompasses both the physical and environmental conditions it requires and the interactions it has with other species. |
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
Subtopic: Introduction to Ecology | Organisms and its Environment |
87%
Level 1: 80%+
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A keystone species in a biological community:
| 1. | is the primary producer. |
| 2. | has no significant impact on the community. |
| 3. | plays a crucial role in maintaining community structure. |
| 4. | is a rare species that must be preserved immediately. |
Subtopic: Introduction to Ecology |
85%
Level 1: 80%+
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