What is heterospory? What is its significance?

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When two types of spores are borne by same plant then this phenomenon is known as heterospory.
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Heterospory is a phenomenon in which two kinds of spores are borne by the same plant. ... Heterospory is thus considered an important step in evolution as it is a precursor to the seed habit. Heterospory evolved first in pteridophytes such as Selaginella and Salvinia
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