In the second step in the evolution of the seed plant life cycle:

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In the second step of the seed plant life cycle, both the male and female gametophytes develop while still in their sporangia. This is because seed plants have heterospory, producing two types of spores- microspores and megaspores. Microspores develop into male gametophytes and are produced in the male sporangia (microsporangia), while megaspores develop into female gametophytes and are produced in the female sporangia (megaspores). Both gametophytes remain within their respective sporangia until they are mature and ready for fertilization.

In the Second Step in the Evolution of the Seed