General Characteristics:

Heterosporous-microspore = pollen grain, and megaspore = embryo sac. The embryo sac remains entirely enclosed in the ovule; a fertilized ovule is a seed. Sporophyte is the dominant generation, and gametophyte is very much reduced. The water is not required for sexual reproduction since male gametes do not swim complex vascular tissues in roots, stem and leaves are existed. It involves two groups viz., Angiospermae and Gymnospermae.

Figure: Seeds of Gymnosperm and Angiosperm

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