Science Question for Friday, October 16th, 2015
Passage I
The following table represents the concentration of ions and dissolved gases in the sediment at the bottom of an ocean. A depth of 0 centimeters (cm) represents the top of the sediment. The concentrations are expressed in parts per million (ppm). The acidity of a solution is represented on a scale known as pH. A pH of 1 is very acidic, a pH of 7 is neutral, and a pH of 14 is very basic.
Table adapted from R.M. Atlas and R. Bartha, Microbial Ecology: Fundamentals and Applications.
©1981 by Addison-Wesley Publishing Company.
————————————————————————————————————————————
A certain type of bottom-dwelling microorganism thrives under the following environmental conditions: low concentrations of Fe2+, high concentrations of O2, and a neutral pH. Based on the table, at which of the following sediment depths would one most likely find this microorganism?
F. 0 cm
G. 5 cm
H. 10 cm
J. 15 cm
市場價：HK$ 92
