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What is heterospory? What are some of the benefits of heterospory? Can you think of why...

What is heterospory? What are some of the benefits of heterospory? Can you think of why this is important step in the evolution of seeds?

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Heterospory are morphologically dissimilar spores produced from two types of sporangia :microspore and megaspore.

It is of great biological adwantage. In Heterospory megaspore is independent of external conditions because it derive food from sporophyte .So it is the better starting point of new embryo .

In it development of zygote takes place in megaspore. This retention and germination of megaspore within megasporangium ensure proper development of zygote. The evolution of seed habit is related to retention of megaspore.

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