Mostly, bacteria are heterotrophic, but some are autotrophic.
All bacteria are heterotrophic.
All bacteria are photosynthetic.
A
All bacteria are photosynthetic.
B
All bacteria are autotrophic.
C
Mostly, bacteria are heterotrophic, but some are autotrophic.
D
All bacteria are heterotrophic.
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Solution
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We cannot say that 'all bacteria are heterotrophs' or 'all bacteria are autotrophs'. Most of them are heterotrophic, but some are autotrophic like Cyanobacteria.
So, the correct option is A.
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