Cycas occurs commonly in

In which one of the following do male and female gametophytes not have a free-living independent existence?

The tallest living tree in the world is ........

Which is the smallest gymnosperm among the following?

Assertion $(A)$: The scale leaves of $Araucaria$ are small and brown.
Reason $(R)$: The gametophyte stage of $Araucaria$ is long-lived and subterranean.
Which option is correct for Assertion $(A)$ and Reason $(R)$?

In which one of the following, the ovules are not enclosed by an ovary wall and remain exposed?