In $Pteridophytes$,meiosis occurs during which of the following processes?

Heterospory,i.e.,the formation of two types of spores—microspores and megaspores—is a characteristic feature in the life cycle of a few members of pteridophytes and all spermatophytes. Do you think heterospory has some evolutionary significance in the plant kingdom?

Heterospory and ligulate leaves are found in ........

Identify the pair of heterosporous pteridophytes among the following:

The basis of seed habit in $Selaginella$ is

Assertion $(A)$: In $Equisetum$,sexual reproduction occurs through sex organs like antheridia and archegonia.
Reason $(R)$: In pteridophytes,the gametophytic phase is long-lived and responsible for sexual reproduction.