The major division in the Kingdom Plantae are-

1. Thallophyta (Algae); 2. Bryophyta; 3. Pteridophyta; 4. Gymnospermae; 5. Angiospermae.

The division is based on the following features:

(a) Well-differentiated plant body: The first level of classification of plants is based on the presence and absence of well-differentiated plant body. Algae (Thallophyta) have simple and less differentiated plant body. Hence, they are separated from rest of the plants.

(b) Vascular tissue: The next level of classification is based on the presence and absence of vascular tissues (i.e., xylem and phloem). Bryophtes do not have vascular tissue, hence they are separated from the rest of the plants.

(c) Ability to bear seeds: The further classification is based on the ability to bear seeds. Pteridophytes do not bear seeds.

(d) Seeds naked or enclosed: Further it is classified whether seeds are naked or enclosed within fruits. The gymnosperms have naked seeds whereas Angiosperms bear seeds enclosed within the fruits.