If you draw the age pyramid for a population that is expanding in size, you would expect that:
1.
the number of individuals in the pre-reproductive age group are more than the number of individuals in the reproductive age group.
2.
the number of individuals in the reproductive age group are less than the number of individuals in the post-reproductive age group.
3.
the number of individuals in the reproductive age group are equal to the number of individuals in the reproductive age group.
4.
the number of individuals in the pre-reproductive age group are less than the number of individuals in the reproductive age group.
| 1. | It is necessitated by nature to maintain the ecological balance . |
| 2. | It helps in maintaining species diversity in a community. |
| 3. | It might lead to the extinction of a species. |
| 4. | Both the interacting species are negatively impacted. |
While explaining interspecific interaction of population, (+) sign is assigned for beneficial interaction, (–) sign is assigned for detrimental interaction and (0) for neutral interaction. Which of the following interactions can be assigned (+) for one species and (–) for another species involved in the interaction?
1. Competition
2. Predation
3. Amensalism
4. Commensalism
1. zero
2. 0.1
3. 10
4. 1.0
The process of individuals of the same species that have come into the habitat from elsewhere during the time period under consideration is referred as:
1. Association
2. Emigration
3. Competition
4. Immigration
Which of the following is the correct equation of exponential growth?
1. \(N_t = N_0 ~e^{rnt}\)
2. \(N_t = N_0 ~e^{rpt}\)
3. \(N_t = N_0 ~e^{rst}\)
4. \(N_t = N_0 ~e^{rt}\)
A population with finite resources shows a logistic growth curve where the correct sequence of events will be:
| 1. | Stationary phase → Acceleration phase → Lag phase → Asymptote |
| 2. | Acceleration phase → Deceleration → Asymptote |
| 3. | Acceleration phase → Leg phase → Stationary phase |
| 4. | Lag phase → Acceleration phase → Deceleration → Asymptote |
Which of the following best describes resource partitioning?
1. competitive exclusion that results in the success of the superior species
2. slight variations in niche that allow similar species to coexist
3. two species that can coevolve to share identical niches
4. differential resource utilization that results in a decrease in community species diversity
1. \(\frac{r N}{K}\)
2. rN
3. rN (K+N)
4. \(r N \frac{(K-N)}{K}\)
1. only the ectotherm uses behavioral thermoregulation
2. only the ectotherm can constrict and dilate the blood vessels to the skin to alter heat flow
3. only the endotherm can have a fever.
4. at a body temperature of 37ºC, the ectotherm has a lower metabolic rate than the endotherm
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