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Solution


Q.

In which group of organisms the cell walls form two thin overlapping shells which fit together              [2015]
1 Dinoflagellates  
2 Slime moulds  
3 Chrysophytes  
4 Euglenoids  

Ans.

(3)

Chrysophytes include diatoms and desmids. The body of diatoms is covered by a transparent siliceous shell (silica deposited in the cell wall) known as frustule. The frustule is made of two valves, epitheca and hypotheca, which fit together like a soap box.