Which gymnosperm possesses a subterranean tuberous stem?

In the embryo of $Pinus$,rosette cells lie:

Gymnosperms do not produce fruits because they lack ........

Assertion :- Gymnosperms do not produce fruit.
Reason :- Ovules of gymnosperms are not enclosed by any ovary wall.

Select one of the following pairs of important features distinguishing $Gnetum$ from $Cycas$ and $Pinus$ and showing affinities with angiosperms.

Assertion $A$: Gymnosperms occupy an intermediate position between Pteridophytes and Angiosperms. Reason $R$: In Gymnosperms,the ovules are naked and develop into naked seeds after fertilization. Which option is correct for Assertion $A$ and Reason $R$?