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Q. No.There are 250 snails in a pond and within a year their number increases to 2500 by reproduction. What should be their birth rate (in per snail per year)?
1.
10
2.
9
3.
25
4.
15
Subtopic: Population Characters: Natality & Mortality |
Level 3: 35%-60%
NEET - 2023
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Select the correct equation for population density at time t+1,
1. \({N_{t+1} =N_t} + [(B + I) - (D +E)]\)
2. \({N_{t+1} =N_t} \times [(B + E) - (D + I)]\)
3. \({N_{t+1} =N_t} + [(B + I) + (D + E)]\)
4. \({N_{t+1} =N_t} \times [(B + D) - (E + I)]\)
1. \({N_{t+1} =N_t} + [(B + I) - (D +E)]\)
2. \({N_{t+1} =N_t} \times [(B + E) - (D + I)]\)
3. \({N_{t+1} =N_t} + [(B + I) + (D + E)]\)
4. \({N_{t+1} =N_t} \times [(B + D) - (E + I)]\)
Subtopic: Population Characters: Natality & Mortality |
72%
Level 2: 60%+
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Identify the correctly matched pair:
1. Only I, II and III
2. Only I, III and IV
3. Only II, III and IV
4. I, II, III and IV
| Scientist | Contribution | |
| I: | Connell | Competitive release |
| II: | Gauss | Competitive exclusion principle |
| III: | MacArthur | Resource partitioning |
| IV: | Tillman | Rivet popper hypothesis |
1. Only I, II and III
2. Only I, III and IV
3. Only II, III and IV
4. I, II, III and IV
Subtopic: Population Interactions: Competition |
58%
Level 3: 35%-60%
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Which of the following is least likely to affect the size of a population?
| 1. | Competition | 2. | Brood parasitism |
| 3. | Commensalism | 4. | Predation |
Subtopic: Population Interactions: Commensalism, Protocooperation & Mutualism |
63%
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To evolve the desired traits, natural selection operates at the level of:
| 1. | Organism | 2. | Population |
| 3. | Species | 4. | Biological community |
Subtopic: Population Attributes |
64%
Level 2: 60%+
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Consider the given two statements:
| Assertion (A): | The tiger census in our national parks and tiger reserves is often based on pug marks and fecal pellets. |
| Reason (R): | For ecological investigations, it is mandatory to know the absolute population densities in all instances. |
| 1. | Both (A) and (R) are True and (R) correctly explains (A). |
| 2. | (A) is True but (R) is False |
| 3. | (A) is False but (R) is True |
| 4. | Both (A) and (R) are True but (R) does not correctly explain (A). |
Subtopic: Population Attributes |
57%
Level 3: 35%-60%
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In ‘competitive release’:
| 1. | differences among similar species whose distributions overlap geographically are accentuated in regions where the species co-occur, but are minimized or lost where the species' distributions do not overlap. |
| 2. | two species which compete for the same limited resource cannot coexist at constant population values. |
| 3. | there is an expansion of the range of a species when a competitor for its niche is removed. |
| 4. | there is a division of limited resources by species to help avoid competition in an ecological niche. |
Subtopic: Population Interactions: Predation |
52%
Level 3: 35%-60%
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In the logistic growth of a population, the acceleration phase is followed by a/an:
| 1. | Lag phase | 2. | Deceleration phase |
| 3. | Asymptote | 4. | Sudden crash phase |
Subtopic: Population: Logistic Growth Model |
Level 3: 35%-60%
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| Assertion (A): | The female anopheles mosquito is not considered a parasite |
| Reason (R): | The bite of the female anopheles mosquito injects infective stage of malarial parasite into human blood |
| 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 Interactions: Parasitism |
62%
Level 2: 60%+
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Consider the two given statements:
| I: | The life cycles of endoparasites are more complex than that of the ectoparasites. |
| II: | The morphological and anatomical features of endoparasites are greatly simplified. |
| 1. | Both I and II are correct and II explains I |
| 2. | Both I and II are correct but II does not explain I |
| 3. | I is correct but II is incorrect |
| 4. | Both I and II are incorrect |
Subtopic: Population Interactions: Parasitism |
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