Multiflagellate male gametes (sperms) are found in

The spore of a fern represents:

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

The prothallus of fern is

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

Rhizophores are formed in