Download Questions 16-19 refer to the following answers. Select the one

Questions 16-19 refer to the following answers. Select the one lettered choice that
best fits each statement.
a) nitrates
b) nitrites
c) ammonia
d) N2 gas
e) NO2 gas
16. Produced in the atmosphere by lightning
17. Fixation of atmospheric nitrogen in the nodules of legumes produces this
form of nitrogen.
18. Full oxidation during secondary sewage treatment produces these ions.
This ion is also the only form of nitrogen usable by plants.
19. When mixed with water vapor produces acid rain.
Questions 28-31 refer to the following answers. Select the one lettered choice that
best fits each statement.
a) O horizon b) A horizon c) E horizon d) B horizon e) C horizon
28. Primarily composed of larger fragments of weathered parent material that
lies directly above the parent material.
29. Topsoil
30. Organically rich surface material that contains partially decomposed
plants, animals, bacteria, and fungi.
31. Subsoil layer that is rich with inorganic minerals.
Questions 40-43 refer to the following answers. Select the one lettered choice that
best fits each statement.
a) mutualism b) parasitism c) commensalism d) interspecific competion
e) intraspecific competition
40. Demonstrated by even spacing of penguins on the shore.
41. Demonstrated by the two organisms involved in forming lichens.
42. Demonstrated by nectar-producing flowers.
43. Demonstrated by broad-leaf plants in a rainforest.