The pairing of homologous chromosomes occurs in ..........

Identify the correct sequence of events during Prophase $I$ of meiosis :
$(a)$ Synapsis of homologous chromosomes
$(b)$ Chromosomes become gradually visible under microscope
$(c)$ Crossing over between non-sister chromatids of homologous chromosomes
$(d)$ Terminalisation of chiasmata
$(e)$ Dissolution of synaptonemal complex
Choose the correct answer from the options given below :

$A$ bivalent of meiosis $I$ consists of

In meiosis,the number of chromosomes is ..............

The non-sister chromatids twist around and exchange segments with each other during

In the given figure,which phase is represented by the part labeled $N$?