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SAT Biology (Ecological) → SAT Biology (Ecological) sample questions from 31 to 40

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31. Donald Johanson, Tom Gray, and others discovered a hominid that lived in East Africa__________ million years ago and nicknamed her Lucy, whose scientific name they gave as __________
(A) 35, Homo habilis
(B) 3.5, Homo africanus
(C) 5.5, Australopithecus africanus
(D) 3.0, Australopithecus afarensis
(E) 5.5, Australopithecus boisei

32. Ammonia is released from dead plants by
(A) denitrifying bacteria
(B) nitrogen-fixing bacteria
(C) bacteria of decay
(D) nitrifying bacteria
(E) none of the above

33. In a natural community, all the living things that directly or indirectly affect the environment are known as
(A) pioneer organisms
(B) keystone species
(C) secondary consumers
(D) climatic factors
(E) biotic factors

34. In order to preserve the biosphere for future generations, humans must
(A) make use of technology to develop new herbicides
(B) put all wild animals in game preserves
(C) explore ways to drain and fill wetlands along the seacoast
(D) understand how living things interact with their environment
(E) settle more people inland, away from the coasts

35. Which group can best be described as a population?
(A) all the honeybees in an orchard in one spring
(B) all the plants and animals in a forest
(C) the living and nonliving factors in a meadow
(D) the life in Earth’s atmosphere
(E) all the buffalo in 1840

36. Competition between the members of a woodchuck population in a large field could be expected to increase as a result of an increase in the
(A) woodchuck reproduction rate
(B) spread of disease among the woodchucks
(C) number of woodchucks killed by cars
(D) number of secondary consumers
(E) natality rate of their predators

37. Let r stand for the intrinsic rate of growth, N for the number of organisms in a population, and K for the carrying capacity. A good formula for logistic growth would be?
(A) rN (N-K)/K
(B) rN (N-r)/rK
(C) rK (K-N)/rN
(D) rK (r-N)/K
(E) rN (K-N)/K

38. Mimicry is an important biotic factor in communities all over the world. For instance, viceroy butterflies closely resemble (mimic) monarch butterflies. Birds that eat viceroys enjoy a good meal, but those that eat monarchs retch right away. What type of mimicry does this describe?
(A) Mullerian
(B) aggressive
(C) crypsis
(D) Batesian
(E) deflection

39. Probably the world’s most pressing ecological problem is
(A) destruction of the rain forests
(B) human overpopulation
(C) depletion of natural resources
(D) over-fishing the oceans
(E) global warming

40. Predators are beneficial to communities because
(A) they control the prey population growth
(B) they practice predation harvest
(C) predators enhance species diversity
(D) Both (A) and (B)
(E) (A), (B), and (C)

ANSWERS: SAT BIOLOGY (ECOLOGICAL) SAMPLE PAPER
31. D
32. C
33. E
34. D
35. A
36. A
37. E
38. D
39. B
40. E