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1.3 Population Ecology โ Test 1
Q1. Which term describes all individuals of the same species living in a given area?โ Population
Q2. Which is NOT a characteristic of K-selected species?โ Semelparity (single big reproductive event)
Q3. A population on the ascending (steep) part of the logistic growth curve mainly behaves as:โ r-strategists
Q4. Which method predicts the likelihood that a species will persist in a given environment?โ Population viability analysis (PVA)
Q5. The force opposing a population's reproductive (biotic) potential is called:โ Environmental resistance
Q6. Which survivorship curve fits organisms that breed several times across a long lifespan with low adult mortality?โ Type I
Q7. An insect population rises from 50 to 60 in one month. If the birth rate is 0.4, the death rate is:โ 0.2
Q8. In a mark-recapture study, 100 butterflies are marked; next day 100 are caught including 25 marked. The estimated population is:โ 400
Q9. The exponential growth rate of a population is correctly written as:โ dN/dt = rN
Q10. During exponential growth, with Nโ initial, Nโ at time t, and n generations, which holds?โ Nโ/Nโ = 2โฟ
Q11. For logistic growth dN/dt = rN(1โN/K), the growth rate is maximum at:โ K/2
Q12. To estimate a lake's fish population, 100 are tagged; a week later 150 are caught with 25 tagged. The population estimate is:โ 600
Q13. A bird population rises from 600 to 645 in a year. If the per-capita birth rate is 0.5, the death rate is:โ 0.425
Q14. Among these equations, exponential population growth is described by dN/dt = rN and Nโ = Nโe^{rt}, i.e.:โ Both the differential and integrated exponential forms
Q15. The net reproductive rate Rโ = 1.5; starting with 500 females, the number after one generation is:โ 750
Q16. An insect population rises from 40 to 46 in one month. If birth rate is 0.4, the death rate is:โ 0.25
Q17. A general increase in average body mass of a species with increasing latitude is known as:โ Bergmann's rule
Q18. When a logistic growth curve flattens into a plateau, it indicates:โ Equality of birth (growth) and death rates at carrying capacity
1.3 Population Ecology โ Test 2
Q19. A species vulnerable to extinction typically does NOT have:โ A variable population that recovers quickly
Q20. The intrinsic rate of natural increase (r) is best defined as the:โ Per-capita growth rate under ideal conditions
Q21. In the logistic equation, K represents the:โ Carrying capacity
Q22. A Type III survivorship curve is typical of species that:โ Produce many offspring with high early mortality
Q23. A broad-based age pyramid (many young individuals) indicates a population that is:โ Rapidly growing
Q24. A metapopulation is best described as:โ A set of local populations linked by dispersal
Q25. For exponential growth with rate r, the doubling time is:โ ln2 / r
Q26. Density-dependent regulating factors are those whose effect:โ Intensifies as density rises
Q27. A species that reproduces once in a single large event then dies is:โ Semelparous
Q28. For a logistic population with K = 20,000 and r = 0.15, the maximum sustainable yield (rK/4) is:โ 750
Q29. An r-selected species typically shows:โ Small size, many offspring, early reproduction, short life
Q30. A K-selected species typically shows:โ Few offspring with high parental investment
Q31. The Allee effect describes a situation where:โ Population growth declines at very low density
Q32. Biotic potential of a population refers to its:โ Maximum reproductive capacity under ideal conditions
Q33. A 'cohort' in population ecology is:โ A group of individuals of the same age
Q34. Match List I with List II:โ A-ii, B-iv, C-i, D-iii
Q35. Source-sink dynamics within a metapopulation means:โ Source patches export migrants to sink patches