(B) Plants that produce two different kinds of spores,namely microspores and megaspores,are known as heterosporous plants. $Selaginella$ and $Salvinia

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(B) Plants that produce two different kinds of spores,namely microspores and megaspores,are known as heterosporous plants. $Selaginella$ and $Salvinia$ are classic examples of pteridophytes that exhibit heterospory. This phenomenon is considered a precursor to the seed habit in higher plants.