Biological Classification And System Of Classification Question 127
The main role of bacteria in the carbon cycle involves decomposing organic matter and releasing carbon dioxide through respiration
[CBSE Mains 1998; AIIMS 2000]
Options:
A) Photosynthesis
B) Assimilation of nitrogenous compounds
C) Chemosynthesis
D) Digestion or breakdown of organic compounds
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Answer:
Correct Answer: C
Solution:
The main role of bacteria in carbon cycle involves breakdown of organic compounds. Some cyanobacteria are involved in photosynthesis too, but photosynthesis is primarily carried out by plants.
And some proteobacteria are chemoautotrophs, which synthesize organic compounds from basic elemental carbon.
But without decomposition of dead organic matter, the carbon in living organisms is not released back into the atmosphere, and will not enter the cycle again.
BETA
