Q. No.During logistic growth, the sigmoid curve will level off when:
1. the population stops reproducing
2. the population starts reproducing asexually
3. the population reaches the environmental carrying capacity
4. sigmoid growth curves never levels off
1. the population stops reproducing
2. the population starts reproducing asexually
3. the population reaches the environmental carrying capacity
4. sigmoid growth curves never levels off
A population with a population pyramid that has an extremely broad base will most likely be:
| 1. | a rapidly expanding population |
| 2. | a stable population |
| 3. | a population where the birth rate equaled the death rate |
| 4. | a population where there were more old than young individuals |
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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 |
The growth of a population is unlikely to be limited by:
| 1. | predation | 2. | harsh weather |
| 3. | disease | 4. | an abundance of natural resources |
Identify the correct statements about symbiotic relationships:
| I: | in a parasitic relationship, one organism is harmed and the other is benefited. |
| II: | coevolution is a feature of many symbiotic relationships. |
| III: | a relationship that appears to be commensalism may in fact be mutualistic or parasitic. |
| IV: | the most efficient type of parasite is one that kills its host. |
| 1. | I, II and III only | 2. | I, III and IV only |
| 3. | II, III and IV only | 4. | I, II, III and IV |
In the formula for exponential growth (dN/dt = rN), what does ‘r’ stand for?
| 1. | the carrying capacity of the environment |
| 2. | the change in time |
| 3. | the number of individuals in the population |
| 4. | the intrinsic rate of natural increase of the population |
The population distribution pattern that will be seen in territoriality is:
1. random
2. uniform
3. clumped
4. None of the above. Territoriality isn't important in determining distribution patterns.
If an organism has type III survivorship curve, the mortality rate of the population will be:
1. fairly constant throughout life
2. higher in post-reproductive years
3. lower after the organisms become established
4. unrelated to age
Morphological defense is the most common defense in plants against herbivory. An example of such a defense would be:
1. Beltian bodies
2. mustard oils
3. epiphytes
4. silica
The biome characterized by a mean annual temperature between 5C and 22C and mean annual precipitation between 5 cm and 50 cm is:
1. Desert
2. Arctic and alpine tundra
3. Temperate forest
4. Grassland
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