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Q. No.The growth rate of a natural population equals zero:
1.
when N/K is exactly one
2.
when N nears the carrying capacity of the habitat
3.
when N/K equals zero
4.
when mortality is greater than natality
Subtopic: Population: Logistic Growth Model |
75%
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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
| Assertion(A): | A population that fits the logistic growth model increases more rapidly at intermediate size rather than at relatively small and large sizes. |
| Reason (R): | The population growth rate decreases dramatically as the population size approaches the carrying capacity. |
In the light of the above statements, choose the most appropriate answer from the options given below :
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
Subtopic: Population: Logistic Growth Model |
51%
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The competitive exclusion principle can be best expressed as:
| 1. | the more abundant species will exclude the less abundant species through competition |
| 2. | competition for the same resources excludes species having different lifestyles |
| 3. | no two species can occupy the same niche indefinitely when resources are limited |
| 4. | larger organisms exclude smaller ones through competition as in the case of large trees controlling underbrush |
Subtopic: Population Interactions: Competition |
73%
From NCERT
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The two species physically interfere with one another by aggressively attempting to exclude one another from particular habitats in:
1. competitive exclusion
2. predation
3. exploitative competition
4. interference competition
1. competitive exclusion
2. predation
3. exploitative competition
4. interference competition
Subtopic: Population Interactions: Competition |
From NCERT
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Which of the following links ecology to population genetics and evolution?
| 1. | Organismic ecology | 2. | Population ecology |
| 3. | Ecosystem ecology | 4. | Biome ecology |
Subtopic: Introduction to Ecology |
66%
From NCERT
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Which of the following is not usually an adaptation for a parasitic mode of life?
| 1. | Loss of unnecessary sense organs |
| 2. | Presence of adhesive organs or suckers |
| 3. | Loss of the digestive system |
| 4. | Low reproductive capacity |
Subtopic: Population Interactions: Parasitism |
87%
From NCERT
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Flowers and their insect pollinators must undergo co-evolution because:
| 1. | Without pollinators plants may get extinct |
| 2. | Plants have to reward the pollinators |
| 3. | The relationship must be safeguarded against cheaters |
| 4. | Insects are the major pollinators of plants |
Subtopic: Population Interactions: Coevolution |
From NCERT
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The relationship between cattle egret and grazing cattle can be best described as:
| 1. | Mutualism | 2. | Commensalism |
| 3. | Parasitism | 4. | Competition |
Subtopic: Population Interactions: Commensalism, Protocooperation & Mutualism |
86%
From NCERT
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What parameters are used for the tiger census in our country’s national parks and sanctuaries?
1. Pug marks only
2. Pugmarks and fecal pellets
3. Faecal pellets only
4. Actual headcounts
1. Pug marks only
2. Pugmarks and fecal pellets
3. Faecal pellets only
4. Actual headcounts
Subtopic: Population Attributes |
89%
From NCERT
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Which of the following would necessarily decrease the density of a population in a given habitat?
1. Natality > mortality
2. Immigration > emigration
3. Mortality and emigration
4. Natality and immigration
1. Natality > mortality
2. Immigration > emigration
3. Mortality and emigration
4. Natality and immigration
Subtopic: Population Characters: Density |
90%
From NCERT
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