Which of the following are heterosporous pteridophytes?I. PterisII. SelaginellaIII. EquisetumIV. Marsilea

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I and II only

II and III only

III and IV only

II and IV only

answer is D.

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Detailed Solution

Heterospory is the occurrence of two kinds of spores, i.e., smaller microspores (producing male gametophyte) and larger megaspores (producing female gametophyte) in the same plant. Heterospory arose in pteridophytes first. It is common in eight genera of pteridophytes which are Selaginella, Isoetes, Marsilea, Salvinia, Azolla etc.

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