28. The mortality rate of organisms following a type IIlsurvivorship curve is A.

Question

28. The mortality rate of organisms following a type IIlsurvivorship curve is A. fairly constant throughout life B. higher in post-reproductive years C. D. lower after the organisms become established higher in pre-reproductive years 29. As a habitat becomes fragmented, the population sizes of a species in the habitat should decrease, effects of genetic drift should , and genetic variation within populations of this species should A. increase; decrease B. increase; increase C. decrease; increase 30. There are 1600 dusky salamanders in a 20-hectare section of Mount Meadow. The average population density of salamanders at this site is per hectare a. 4 b. 20 C. 80 d. 160 31. If the population density of ocotillo in a desert is 25 per square kilometer, how many plants would be expected in an area that is 5 km x 3 km? a. 45 b. 225 ?. 375 d. 1,500 32. Which of the following is NOT an abiotic feature of the environment? a. density of earthworms present in the soil b. salinity of the soil c. amount of sunlight the soil receives d. All of the above are abiotic factors. 33. Which of the following populations would be expected to grow in size? A. A population with an r of 0.1 B. A population with a ? of 0.1 D. Both a and b E. Neither A nor B

Explanation / Answer

28.the mortality rate of organisms following a type iii survivorship curve is lower after the organisms become established

29.effects of genetic drift should increase and genetic variation within any given population in the habitat should decrease

30.80 per hectare

31.the plants number would be 5*3*25 = 375

32.density of earthworms present in the soil,this is a biotic factor

33.

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