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What is heterospory? Briefly comment on ...

What is heterospory? Briefly comment on its significance. Give two examples.

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Heterospery. Heterospory is the production of two different kinds of spores, i.e., male microspores and female megaspores in two separate sporangia, i.e., microsporangia and megasporangia.
Significance of heterospory. Heterospory is the first step towards seed habit.
Examples : Selaginella and Marsilea.
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