Which one of the following is heterosporous?

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(D) The correct answer is $D$. In pteridophytes,the sporophyte produces spores inside sporangia. Most pteridophytes produce only one type of spore,kno

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Salvinia

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(D) The correct answer is $D$. In pteridophytes,the sporophyte produces spores inside sporangia. Most pteridophytes produce only one type of spore,known as homosporous (e.g.,$Equisetum$,$Adiantum$,$Dryopteris$). However,some genera like $Salvinia$,$Selaginella$,$Azolla$,$Marsilea$,and $Isoetes$ produce two different types of spores,known as heterosporous. Therefore,$Salvinia$ is heterosporous.

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