In which of the following, root system is poorly developed?
a)	Phaene	b)	Hydrilla	c)	Halophyte	d)	Xerophyte

(b)

Hydrophytes are those plants that grow in water conditions. Water conduction systems are not well developed in them. So, roots are poorly developed. Roots are required only for anchorage, while halophytes are those plants that grow in high salty or marshy areas. In those plants, root system is very well developed. Roots may be entirely absent in hydrophytes like Wolffia, Salvinia, Ceratophyllum or poorly developed in Hydrilla.