Question

1. Consider two primary environment types: oxic or anoxic (both can also be an answer). Which one applies?

a. Reducing reactions tend to take place in:

b. Transformation of SO4 to H2S would be favored in:

c.Transformation of CH4 to CO2 would be favored in:

d. Labile organic nitrogen is likely to be consumed in:

e. Chemolithoautotrophs are commonly found in:

f. Chemoorganoheterotrophs are commonly found in:

Answer 1

A. Anoxic, because reduction reactions will take place in the absence of oxygen.

B. Anoxic, the given process is reduction of sulphate to hydrogen sulphide and reduction occurs in the absence of oxygen.

C. Oxic, conversion of methane to carbondioxide is oxidation which will definitely require oxygen.

D. Oxic, because then it would be easier for the cell to break it down by undertaking cellular respiration.

E. and F. Oxic, because former will oxidize inorganic compounds and the latter will oxidize organic compounds in the presence of oxygen only.

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