A student observes a pteridophyte and notes two distinct features: it possesses small leaves (microphylls) and produces two different kinds of spores (macrospores and microspores). Based on these characteristics, to which of the following classes does this plant most likely belong?

Step-by-step solution

The presence of small leaves (microphylls) is a characteristic feature of the genus Selaginella, whereas ferns typically have large leaves (macrophylls). Furthermore, the production of two different kinds of spores (macrospores and microspores) indicates that the plant is heterosporous. Among pteridophytes, Selaginella and Salvinia are the prominent heterosporous genera mentioned in NCERT. Combining both features (microphylls and heterospory), the plant described is Selaginella. According to the classification of p