Growth and Nutrition of Bacteria
Organisms such as lactobacilli that have elaborate requirements for specific nutrients i.e. vitamins and other growth promoting substances, are generally called as

chemotrophs
chemo-lithotrophs
photo-organotrophs
fastidious hetrotrophs

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Growth and Nutrition of Bacteria
Generation time is

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

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