plant are defined as muticellular organisms. they are of heterotrophic mode of nutrition . plants are divided in cryptogamae and phanaerogamae
crytogamae are divided into 3 groups thallophyata , bryophyta , pteridophyta.
thallophyta is the simplest plant organisms with no differentiated body . then comes the bryophyta it has differentiated body but no vascular tissue ,then comes pteridophyta which has a differentiated body , has a vascular bundle but does not bear seeds.
phanaerogamae are divided into 2 parts gymnosperms and angiosperms .gymnosperms bear seeds and are naked and angiosperms bear seeds they are not seen nakedly . angiosperms is divided into 2 parts dicot and monocot .dicot are those who has one cotyledon and monocot are those who has 2 cotyledons .
i hope that this will help u...........................^_^