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Question

Which one of the following statements is correct?
  1. All bacteria are autotrophic.
  2. Mostly, bacteria are heterotrophic, but some are autotrophic.
  3. All bacteria are heterotrophic.
  4. 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.
Solution
Verified by Toppr

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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