A) Anaerobic respiration plays a major role in the global nitrogen, sulphur and carbon cycles
B) Including muscles and other tissues, all the cells in human bodies respire only aerobically
C) Anaerobic respiration is used mainly by eukaryotes that live in environments devoid of oxygen.
D) All of the above
Correct Answer: A
Solution :
[a] Anaerobic respiration plays a major role in the global nitrogen, sulphur and carbon cycles through the reduction of the oxyanions of nitrogen, sulphur and carbon to more reduced compounds. Dissimilatory denitrification is the main route by which biologically fixed nitrogen is returned to the atmosphere as molecular nitrogen gas.
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