How far does Selaginella,one of the few livin | vedclass

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(C) $\rightarrow$ Seed habit is a significant evolutionary step in plants. $Selaginella$ exhibits several precursors to the seed habit,such as heteros

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It lacks the development of an integumented megasporangium (ovule).

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(C) $\rightarrow$ Seed habit is a significant evolutionary step in plants. $Selaginella$ exhibits several precursors to the seed habit,such as heterospory (production of two types of spores) and the retention of the megaspore within the megasporangium for a period.$\rightarrow$ However,$Selaginella$ falls short of the true seed habit due to the following reasons:$(i)$ It lacks the formation of an integumented megasporangium,which is essentially an ovule.$(ii)$ The megaspore is not permanently retained within the parent plant to develop into a seed; it is eventually shed.$(iii)$ There is no formation of a seed coat,which is necessary to protect the embryo.$\rightarrow$ Therefore,while $Selaginella$ shows the 'evolutionary tendency' toward seed habit,it fails to complete the process because it does not develop a true ovule or a seed.

How far does $Selaginella$,one of the few living members of $Lycopodiales$ $(pteridophytes)$,fall short of the seed habit?

Similar Questions

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