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Q.
Selaginella and Salvinia are considered to respresent a significant step towards evolution of seed habit because
AIPMTAIPMT 2011Plant Kingdom
Solution:
Selaginella and Salvinia are heterosporous pteridophytes. Pteridophytes are vascular cryptogams i.e., they are having vascular tissue but not seed, flower and fruit like in angiosperms and gymnosperms. But development of zygotes into young embryos take place within the female gametophyte represents an important step toward seed habit.