Which one of the following living organisms completely lacks a cell wall?
- Cyanobacteria
- Sea-fan ( Gorgonia)
- Saccharomyces
- Blue-green algae
Answer
(2) Sea-fan ( Gorgonia)
Solution
Sea-fan ( Gorgonia) is a cnidarian, i.e. an animal; animal cells have no cell wall.
∵ Cyanobacteria (blue-green algae) have a cell wall, and Saccharomyces (yeast, a fungus) has a chitinous cell wall.
∴ Sea-fan completely lacks a cell wall.
Answer: (2)