QUESTION 12 The United Nations estimates that by 2050, the world\'s population m
ID: 280027 • Letter: Q
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QUESTION 12 The United Nations estimates that by 2050, the world's population may reach over billion and still be growing O 12.4 O 7.3 O 9.3 O 156 20.5 QUESTION 13 All members of a species that reside within an ecosystem make up a(n) O population O aggregation. O community. O ecotone. O trophic level. QUESTION 14 Invasive species can rapidly disrupt an ecosystern because they have a high biotic potential and face little environmental resistance. True or False? O True O False QUESTION 15 Succession that begins on bare rock after glaciers have passed, or on newly formed volcanic islands, is O secondary O autogenic O pioneer O primary. O allogenic. QUESTION 16 The population shown in the graph is demonstrating 80 70- 50 40 30 1950 1955 1960 1965 O exponential growth. O dlumped distribution. O an S curve growth pattern. O logistic population growth. O a typical boom-and-bust pattern. QUESTION 17 In his 1961 paper "The Paradox of the Plankton," ecologist G. E. Hutchinson noted that several species of algae coexist, sharing the same few mineral nutrient resources in homogeneous open-water systems. Because there is little chance of resource partitioning and niche differentiation in such a situation, the paradox of their coexistence is an apparent violation of O the second law of thermodynamics O the law of mass action. O the climax theory of succession. O the competitive exclusion principle. O Darwin's theory of evolution by means of natural selection.Explanation / Answer
12. As per demographic studies, three estimates of fertility rate were implied for population projections by the United Nations:
Answer: 9.3
13. Population is described as: all members of the same species in specific are or region of ecosystem.
Answer: Population.
14. Invasive species are defined as species which are non-native to an ecosystem, are intrusive in nature and have high biotic potential. Whose introduction in ecosystem causes harm to environment, economics and humans. Thus, invasive species may rapidly disrupt ecosystem.
Answer: True.
15. Glaciers or volcanic eruptions, leave behind bare or barren rocks, with no soil to sustain life. Thus, the first species that appear are described by primary succession.
Answer: Primary.
16. The graph demonstrating population numbers, exhibit fluctuations over a time. This type of graphs is termed as boom and bust patterns.
Answer: a typical boom-and-bust pattern.
17. “The paradox of phytoplankton” reflected that two species cannot occupy the same ecological niche, thus, demonstrating competitive exclusion principle.
Answer: The competitive exclusion principle.
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