Q. No.When does the growth rate of a population following the logistic model equal zero? The logistic model is given
As dN/dt=rN(1─N/K)
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 death rate is greater than birth rate.
As dN/dt=rN(1─N/K)
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 death rate is greater than birth rate.
Which of the following is correct for r-selected species?
1. Large number of progeny with large size.
2. Small number of progeny with small size.
3. Small number of progeny with large size.
4. Large number of progeny with small size.
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The principle of competitive exclusion was stated by:
| 1. | G. F. Gause. | 2. | Mac Arthur. |
| 3. | Verhulst and Pearl. | 4. | C. Darwin. |
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If ‘+’ sign is assigned to beneficial interaction, ‘─’ sign to detrimental and ‘0’ sign to neutral interaction, then the
Population interaction represented by ‘+’ ‘─’ refers to
1. amensalism.
2. commensalism.
3. parasitism.
4. mutualism.
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Asymptote in a logistic growth curve is obtained when:
| 1. | K = N | 2. | K > N |
| 3. | K < N | 4. | The value of ‘r’ approaches zero |
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Natality refers to
1. Number of individuals leaving the habitat
2. Birth rate
3. Death rate
4. Number of individuals entering a habitat
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Which one of the following population interactions is widely used in medical science for the production of
antibiotics?
1. Parasitism
2. Mutualism
3. Commensalism
4. Amensalism
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In a growing population of a country:
| 1. | Reproductive and pre-reproductive individuals are equal in number. |
| 2. | Reproductive individuals are less than post-reproductive individuals. |
| 3. | Pre-reproductive individuals are more than reproductive individuals. |
| 4. | Pre-reproductive individuals are less than reproductive individuals. |
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A keystone species is the one which has
1. A small proportion of total biomass but has huge impact on community’s organisation and survival
2.A plenty of biomass but low impacts on community’s organisation
3. A rare species with little impact on biomass and other species in the community
4. A dominant species which has a large proportion of biomass and which affects many other species
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