Evaluate the key evolutionary advancements seen in Pteridophytes.
a. They are the first terrestrial plants to possess vascular tissues, xylem and phloem.
b. The main plant body is a sporophyte, which is a shift from the gametophyte-dominant life cycle of bryophytes.
c. The sporophyte is differentiated into true root, stem, and leaves.
d. They developed sporophylls, which are leaf-like appendages that bear sporangia.
e. Some pteridophytes developed compact structures of sporophylls called strobili or cones.
f. They achieved independence from water for fertilization.
g. The development of heterospory in some members is a precursor to the seed habit.
