The presence of rhizoids in saprophytic plants is a characteristic of which group?

Horsetail and fern are

Sporangia are associated with sporophylls. In $P$ plants,sporophylls are distinct,while in $Q$ plants,sporophylls form compact structures called strobili or cones.
$P \quad Q$

The basis of seed habit in $Selaginella$ is

Which of the following is associated with the sporophytic phase in $Pteridophytes$?

Which of the following is considered an important step in the evolution of the seed habit?