The dominant generation in pteridophytes is:

$A$ fern prothallus is bisexual. If fertilization takes place between the gametes produced by the same prothallus,then it is known as:

Assertion $(A)$: $Nephrolepis$ is a cryptogam.
Reason $(R)$: It is a bryophyte.

The stem of $Selaginella$ is anatomically characterized by the presence of

Two very distinct generations are found in the life cycle of

In which of the following plants is the diploid stage generally dominant?