Sometimes the prothallus of a fern gives rise to a fern plant. This is an example of:

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.

$Pteris$ and $Adiantum$ resemble each other in having:

The first vascular plants are:

In the prothallus of $Dryopteris$ (fern),the sex organs are located as follows:

In $Pteridophytes$, the main plant body is $........$.