The cells of a fern prothallus contain a nucleus with:

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

Which of the following is known as the 'Adder's tongue fern'?

In Pteridophytes,the main plant body is responsible for which of the following?

Given below are the stages in the life cycle of pteridophytes. Arrange the following stages in the correct sequence.
$A.$ Prothallus stage
$B.$ Meiosis in spore mother cells
$C.$ Fertilisation
$D.$ Formation of archegonia and antheridia in gametophyte.
$E.$ Transfer of antherozoids to the archegonia in presence of water.
Choose the correct answer from the options given below.

The antherozoids of $Selaginella$ have: