What type of bacteria have gas vacuoles?

What type of bacteria have gas vacuoles?
  1. Purple and green photosynthetic bacteria
  2. Blue green photosynthetic bacteria
  3. Cyanophycean bacteria
  4. All of the above

Solution

Gas vacuoles are found in blue green, purple, and green photosynthetic bacteria as well as cyanophycean bacteria.

Asked in: NCERT

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