What are the major divisions in the Plantae? What is the basis for these divisions?
The kingdom Plantae is divided into five main divisions: Thallophyta, Bryophyta, Pteridophyta, Gymnosperms, and Angiosperms.
The classification depends on the following criteria:
• Differentiated / Undifferentiated plant body
• Presence / absence of vascular tissues
• With/without seeds
• Naked seeds/ seeds inside fruits
(i) Thallophyta : these are simple , thalloid and undifferentiated body parts. They do not have roots, stems and leaves.
(ii) Bryophyta : their plant body is more differentiated and has root ,stem and leaf-like body parts. They do not have vascular tissue.
(iii) Pteridophyta : they have true root, stem and leaf. They possess well differentiated vascular tissue.
(iv) Gymnosperm : the plants in which ovules are not enclosed by any ovary wall i.e naked - seeded plants.
(v) Angiosperm : seeds are enclosed in fruits.
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