Plant Science Videos General The Importance of Plants in Life ABC Model of Flower Development Pteridophytes Types of Stele and its Evolution in Pteridophytes Difference between Eusporangiate and Leptosporangiate ferns? What is the Difference Between Homosporous and Heterosporous Plant Life Cycle? Different types of Steles found in Lycopodium Plant Anatomy Anomalous Secondary Thickening in Bignonia.