Which of the following is commonly known as the 'Chilgoza Pine'?

Gymnosperms are called naked-seeded plants because they lack:

In $Pinus$,the female gametophyte develops only from:

In a gymnosperm,if the haploid chromosome number is $12$,what will be the number of chromosomes in its root and endosperm,respectively?

$A$- In conifers,leaves reduce the surface area.
$R$- Conifers have needle-like leaves.

Give information about the reproductive organs of Gymnosperms.