A) All bacteria are heterotrophic
B) Bacteria are either heterotrophic or chemoautotrophic
C) Bacteria are either heterotrophic or photoautotrophic
D) Bacteria are only occasional autotrophic
Correct Answer: D
Solution :
Some of the bacteria are autotrophic, i.e., they synthesise their own food from inorganic substrates. They may be photosynthetic autotrophic or chemosynthetic autotrophic. The vast majority of bacteria are heterotrophs, i.e., they do not synthesise their own food but depend on other organisms or on dead organic matter for food.
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