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Explain homosporous and heterosporous spore formations.
 

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In majority of the pteridophytes all the spores are of similar kinds; such plants are called homosporous, eg. Equisetum, Pteris and other ferns but in 8-9 plants of genera like Selaginellaand Salvinia which produce two kinds of spores, macro (large) and micro (small) spores, are known as heterosporous

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