Growth and Nutrition of Bacteria
All organisms require at least small amounts of carbondioxide, However, some can use CO2 as their sole source of carbon. Such organisms are termed as

autotrophs
chemotrophs
phototrophs
photo-organotrophs

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Growth and Nutrition of Bacteria
Generation time is

both (a) and (c)
time required for the population to double
obtained by expression t/n, where t = time interval, n = number of generation
time required for the initial adjustment

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