What type of fertilization occurs in gymnosperms?

Pinus seed shows:

The spermatozoid of $Cycas$ is:

The wood of gymnosperms is non-porous because it .....

The giant tree among the pines belongs to

$A$: Microspores and megaspores are produced in the same lax in gymnosperms.
$R$: Lax represents a compact strobilus which bears microsporophyll and megasporophyll.