Which structure in the pteridophyte life cycle is equivalent to the 'pollen grain' of gymnosperms in terms of being the male gametophyte?
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Correct answer: The male prothallus
The male prothallus (developed from a microspore in heterosporous forms) is the male gametophyte, equivalent to the pollen grain of gymnosperms. In gymnosperms this stage is highly reduced and represented by the pollen grain.
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