Homologous pairing in prophase $I$ of meiosis $I$ is called

If a leaf cell has $8$ chromosomes,it is most likely that:

$S -$ Statement: In the pachytene substage,each group of chromosomes appears as a bivalent.
$R -$ Reason: During prophase in plant cells,the centriole units arranged at the two poles form spindle fibers.

The final stage of meiotic prophase-$I$ is ......

Which of the following stages of meiosis is responsible for deciding the genetic constitution of gametes?

Which phase of meiosis is the longest?