Which of the following is not involved in the fertilization of a fern?

The plant body is differentiated into true roots, stems, and leaves in:

Assertion $(A)$: The sporophyte phase of ferns is long-lived and dominant.
Reason $(R)$: In ferns,the sporophyte phase exists as a thallus.

What is the number of chromosomes in each cell of the root of Ophioglossum?

Indusium in $Pteridium$ is:

In $Selaginella$,when the sporophyte develops directly from the female gametophyte other than the oosphere,the condition is called: