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Heterospory is the production of two distinct types of spores by certain plants, namely microspores and megaspores, which develop into male and female gametophytes, respectively. This condition contrasts with homospory, where only one type of spore is produced, developing into a bisexual gametophyte. Heterospory is significant in the evolutionary history of plants as it marks a key step towards the development of seeds and more advanced reproductive strategies. In heterosporous plants, microspores give rise to male gametophytes that produce sperm cells, while megaspores develop into female gametophytes containing egg cells. This separation of spore types promotes outcrossing and genetic diversity by physically segregating male and female _____ ________ _______ _______ _____ _________ ____ ______ _______ ____ ____ _______.
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