Question

Photoautotrophs lacking chlorophyll a are

• A. Cyanobacteria
• B. Red algae
• C. Brown algae
• D. Bacteria

Answer 1

The correct option is A Cyanobacteria

Cyanobacteria are different in many important ways from other photosynthetic prokaryotes. Instead of the bacteriochlorophylls found in purple and green bacteria, blue-greens contain chlorophyll a, as in eukaryotic phototrophs, and, produce free oxygen as a byproduct of photosynthesis. Cyanobacteria, however, lack the organized chloroplasts of eukaryotes and have their photosynthetic apparatus distributed peripherally in the cytoplasm.

So, the correct option is 'Option A'.