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This event shown by pteridophytes is an important step in evolution-

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Formation of reduced gametophyte

Homosporous condition

Presence of micro and macrophylls

Retention of female gametophyte in the megasporangium of a plant even after fertilization and embryo development in the female gametophyte

answer is D.

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Detailed Solution

Retention of female gametophyte in the megasporangium of sporophyte even after fertilization and embryo development helps in the origin of seed habit. Seed habit is seen for the first time in gymnosperms.

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