In which group of organisms the cell walls form two thin lapping shells which fit together?

Step-by-step solution

CHRYSOPHYTES: Chrysophytes include diatoms and golden algae (desmids). These are found both in fresh and marine water. They are microscopic and float passively (without using energy) in water currents. Most of Chrysophytes are photosynthetic. Silica is deposited in the cell wall of diatoms. The cell walls form two thin overlapping shells, which fit together as in a soapbox. During asexual reproduction, each daughter cell retains one half of the old wall and synthesizes a new half. Diatoms are normally diploid and r