Question

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

• A. Slime moulds
• B. Chrysophytes
• C. Euglenoids
• D. Dinoflagellates

Answer 1

The correct option is B Chrysophytes

Kingdom Protista is eukaryotes and unicellular organisms. They are divided into different groups; chrysophytes, dinoflagellates, euglenoids and slime moulds. Chrysophytes are freshwater organisms which are microscopic and float passively in water currents. Chrysophytes are again subdivided into diatoms and desmids. Diatoms have rare cells forms two overlapping shells, which fit together as in a soapbox. The cell walls are fixed inside of the silica and are perpetual. The cell wall deposition of diatoms; over billions of years is called ‘diatomaceous earth’. This soil is rough and used as polishing surface and filtration for oils and syrups. Diatoms are the major producers in the oceans.

So, the correct answer is option B.