Kingdom Protista Chrysophytes

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

1.	Chrysophytes	2.	Euglenoids
3.	Dinoflagellates	4.	Slime moulds

Select the wrong statement:

1.	The walls of diatoms are easily destructible
2.	Diatomaceous earth is formed by the cell walls of diatoms
3.	Diatoms are chief producers in the oceans
4.	Diatoms are microscopic and float passively in water

Which of the following organisms are known as chief producers in the oceans?

1.	Dinoflagellates	2.	Diatoms
3.	Cyanobacteria	4.	Euglenoids