Match the following.

	Column - I		Column – II
a)	Diatoms	i)	Mostly marine, thick cellulosic plates, two flagella, variously coloured and cause red tides
b)	Dinoflagellates	ii)	Animal protists, cilia and flagella, non green and without cell wall
c)	Euglenoids	iii)	Fresh water forms, pellicle, chlorophyll ‘a’ and ‘b’, two unequal flagella, pyrenoids
d)	Protozoans	iv)	Silica in cell walls, major producers, transverse binary fission, gliding movements and auxospores

	a	b	c	d
1.	iv	i	iii	ii
2.	iii	iv	i	ii
3.	ii	iii	i	iv
4.	i	iv	iii	ii

Diatoms have silica in their cell walls. They are major producers in oceans. They multiply with transverse binary fission. Diatoms show gliding movements. Auxospores of daitoms are specialised cells that help in dormancy, sexal reproduction and growth. Dinoflagellates are mostly marine, have thick cellulosic plates with two flagella and are of various colours and cause red tides. Euglenoids live in fresh water and have pellicle instead of cell wall. Euglena contain pigments like chlorophyll, a and b. Euglena possess two unequal flagella and pyrenoids. Protozoans are animal protists. Some of them pocess cilia and some members have flagella. They are non green and do not have cell wall.